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"[Penelitian ini bertujuan untuk mengetahui pengaruh kekasaran, proses phosphating, serta ketebalan adhesive bonding terhadap ketahanan delaminasi komposit laminat. Variasi kekasaran substrat, yaitu pada rentang 5-8 μm dan 10-13 μm, variasi terhadap proses phosphating, yaitu ada yang melalui proses phosphating dan ada yang tidak, serta variasi ketebalan adhesive baik primer ataupun topcoat dengan rentang 1-5 μm, 6-10 μm, serta 11-15 μm. Pembentukan komposit laminat ini dilakukan melalui proses transfer moulding pada suhu 160 C selama 450 detik. Komposit laminat yang sudah terbentuk kemudian diuji peel-off untuk mengetahui kekuatan delaminasinya lalu dikarakterisasi dengan SEM-EDX. Hasil menunjukan bahwa kekasaran permukaan, lapisan zinc phosphate, serta ketebalan adhesive bonding mempengaruhi ketahanan delaminasi komposit laminat yang diinterpretasikan dengan kekuatan ikat antarlapisan dan visual delaminasi. Kekasaran optimum terjadi pada rentang 10-13 μm dengan kekuatan ikat 179,68 N dan visual delaminasi R-R sebanyak 35%. Adanya lapisan zinc phosphate memberikan nilai kekuatan ikat optimum sebesar 157,38 N dan visual delaminasi R-R sebanyak 50%. Ketebalan adhesive primer optimum terjadi pada rentang 1-5 μm dengan kekuatan ikat 163,35 N dan visual delaminasi R-R sebanyak 50%. Ketebalan adhesive topcoat optimum terjadi pada rentang 6-10 μm dengan kekuatan ikat sebesar 154,65 N dan visual delaminasi R-R sebanyak 41,6%.;This study aims to determine the effect of roughness, phosphating process, and the thickness of the adhesive bonding into delamination resistance of laminate composite. Variation of the substrate roughness are 5-8 μm and 10-13 μm. Some substrates are coated by zinc phosphate and other substrate are uncoated. Variations of the thickness of adhesive primer and adhesive topcoat are in a range of 1-5 μm, 6-10 μm, and 11-15 μm. The process of forming the laminate composite occurs through transfer molding process at 1600C in 450 seconds. Laminate composite that has been formed then tested by peel-off test to determine the strength of delamination. Visual of delamination was characterized by SEM-EDX. The results showed that the optimum surface roughness occurs in the range of 10-13 μm with bonding strength 179.68 N and 35% of R-R visual. The coated substrate has a higher bonding strength compared to uncoated substrate, which is 157.38 N and 50% of R-R visual. The optimum thickness of adhesive primer occurs in the range of 1-5 μm with bonding strength is 163.35 N and 50% of R-R visual. While the optimum thickness of adhesive topcoat occurs in the range of 6-10 μm with a bonding strength is 154.65 N and 41,6% of R-R visual;This study aims to determine the effect of roughness, phosphating process, and the thickness of the adhesive bonding into delamination resistance of laminate composite. Variation of the substrate roughness are 5-8 μm and 10-13 μm. Some substrates are coated by zinc phosphate and other substrate are uncoated. Variations of the thickness of adhesive primer and adhesive topcoat are in a range of 1-5 μm, 6-10 μm, and 11-15 μm. The process of forming the laminate composite occurs through transfer molding process at 1600C in 450 seconds. Laminate composite that has been formed then tested by peel-off test to determine the strength of delamination. Visual of delamination was characterized by SEM-EDX. The results showed that the optimum surface roughness occurs in the range of 10-13 μm with bonding strength 179.68 N and 35% of R-R visual. The coated substrate has a higher bonding strength compared to uncoated substrate, which is 157.38 N and 50% of R-R visual. The optimum thickness of adhesive primer occurs in the range of 1-5 μm with bonding strength is 163.35 N and 50% of R-R visual. While the optimum thickness of adhesive topcoat occurs in the range of 6-10 μm with a bonding strength is 154.65 N and 41,6% of R-R visual, This study aims to determine the effect of roughness, phosphating process, and the thickness of the adhesive bonding into delamination resistance of laminate composite. Variation of the substrate roughness are 5-8 μm and 10-13 μm. Some substrates are coated by zinc phosphate and other substrate are uncoated. Variations of the thickness of adhesive primer and adhesive topcoat are in a range of 1-5 μm, 6-10 μm, and 11-15 μm. The process of forming the laminate composite occurs through transfer molding process at 1600C in 450 seconds. Laminate composite that has been formed then tested by peel-off test to determine the strength of delamination. Visual of delamination was characterized by SEM-EDX. The results showed that the optimum surface roughness occurs in the range of 10-13 μm with bonding strength 179.68 N and 35% of R-R visual. The coated substrate has a higher bonding strength compared to uncoated substrate, which is 157.38 N and 50% of R-R visual. The optimum thickness of adhesive primer occurs in the range of 1-5 μm with bonding strength is 163.35 N and 50% of R-R visual. While the optimum thickness of adhesive topcoat occurs in the range of 6-10 μm with a bonding strength is 154.65 N and 41,6% of R-R visual]"

"Saat ini, istilah komposit laminat pada umumnya hanya digunakan unuk menyebut komposit bermatrik polimer padahal material laminasi yang berbasis logam juga dapat disebut komposit laminasi (LMCs). Proses pembuatan komposit laminat hibrid Al/SiC-Al/Al2O3 dilakukan dengan metalurgi serbuk, dimana matrik aluminium dikuatkan dngan partikel SiC dan Al2O3. Metode ini memungkinkan komposit laminat hibrid dibuat seolah hanya satu lapisan namun dengan 2 jenis penguat yang berbeda. Metalurgi serbuk yang digunakan untuk membuat komposit laminat Al/SiC-Al/Al2O3 ini memiliki kelebihan seperti hasil yang mendekati ukuran sebenarnya, kehomogenen komposisi mikroskopik dan lebih murah secara biaya dibandingkan proses konvensional dengan casting. Pendekatan komposit isotropik digunakan untuk melakukan analisa awal terhadap komposit laminat hibrid. Sebelum digunakan sebagai penguat partikel SiC dan Al2O3 dilapisi dengan oksida logam melalui proses elektroless plating dari larutan elektrolit HNO3, Mg dan Al. Volum fraksi SiC dan Al2O3 divariasikan 10, 20, 30 dan 40%. Temperatur dan waktu tahan sintering dilakukan pada 500, 550, 600oC dan 2, 4, 6 jam untuk memperoleh kompaktibilitas komposit laminat optimum. Kompaktibilitas komposit laminat hibrid dikarakterisasi dari densitas, porositas dan modulus elastis komposit. Berdasarkan hasil pengujian HR-SEM, XRD, uji bending dan uji CTE, nilai sifat mekanik (modulus elastisitas) optimum dari komposit laminat hibrid Al/SiC-Al/Al2O3 diperoleh pada 40%Vf SiC/40%Vf Al2O3 temperatur sinter 600oC waktu tahan sinter 6 jam. Fenomena kegagalan antarmuka lapisan seperti retak, delaminasi dan kerusakan terjadi dan dipicu akibat ketidaksesuaian CTE antarlapisan.

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Recently, term of laminate composite most widely used only for polimer matrix composites. Laminated material base on metal called Laminates Matrix Composites (LMCs). The manufacturing process of Al/SiC-Al/Al2O3 hybrid laminated composites by powder metallurgy is reviewed. Matrix aluminum had reinforced by SiC-Al2O3 particulate. The methods available to form the hybrid laminated composites like a monolayer composites with different reinforcement. Powder metallurgy has been used for the fabrication of Al/SiC-Al/Al2O3 hybrid laminated composites and had many advantages such as near-net shaping, microscopic compositional homogeneity, and low cost compared with conventional processing using melting and casting methods. Particulate isotropic composite approach used in the formulation of cohesion elements are described initially. Before used as reinforcement, Particle SiC and Al2O3 coated by metal oxide obtained by electroless platting from electrolyte HNO3, Mg and Al. Volume fraction SiC and Al2O3 were varietied 10, 20, 30 and 40%. Temperature and holding time sintering conducted for 500, 550, 600oC and 2, 4, 6 hour to obtain optimatized compactibility of composite. The compatibility of hybrid laminate composite was characterized by investigation of density, porosity and elastic moduly. Based on investigations by HR-SEM, XRD, Bending Test and CTE concluded that the optimum mechanical properties of Al/SiC-Al/Al2O3 was obtained since 40%Vf SiC/40%Vf Al2O3 temperature sinter 600oC and holding time 6 hour. Interface phenomenon interlayer as cracking, delamination and fracture was occurred and triggered by mismatch CTE interlayer."

"Pengembangan tank sebagai kendaraan tempur saat ini terus dilakukan untuk meningkatkan kekuatan militer suatu negara. Salah satu komponen utama pada tank adalah material armor. Penggunaan aluminium dan serat kevlar yang kemudian disusun menjadi material komposit laminat memiliki massa jenis yang jauh lebih rendah dari baja, namun memiliki kekuatan impak yang tinggi, sehingga diharapkan dapat menggantikan peran baja pada tank sebagai material armor. Pada penelitian ini, untuk membuat material komposit laminat hybrid digunakan AA 5052 sebagai matriks dan kevlar yang diimpregnasi dengan nano aluminium oksida sebagai penguatnya. Terdapat 3 variasi jumlah lapisan kevlar yang dilakukan dalam penelitian ini, yaitu 20, 30, dan 40 lapisan yang disusun tiga tingkat dalam satu sampel komposit laminat hybrid. Semakin tebal lapisan kevlar, semakin besar nilai kekuatan impak komposit laminat hybrid. Pada sampel terimpregnasi, hasil pengujian balistik dengan NIJ standard 0108.01 yang dilakukan menunjukkan sampel dengan 20 lapisan kevlar dapat tahan uji balistik level 3, sedangkan sampel dengan 30 lapisan kevlar dapat tahan uji balistik level 4.

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The development of tank as a combat vehicle is currently being carried out to increase the military strength of a country. One of the main components of the tank is the armor material. Aluminum and kevlar fiber which is then arranged into a laminated composite material has a lower density than a steel, but has a high impact strength, so it is expected to replace the role of steel in tanks as armor material. In this study, to make a hybrid laminate composite material, aluminum alloy 5052 was used as a matrix, and kevlar impregnated with nano aluminum oxide as reinforcement. There are 3 variations in the number of kevlar layers carried out in this study (20, 30, and 40 layers). Each of the type will be arranged in three tiers in one sample of hybrid laminate composite. The thicker the kevlar layer, the greater the value of the impact strength of the hybrid laminate composite. For the impregnated sample, the results of the ballistic test with NIJ standard 0108.01 that were carried out showed that the sample with 20 layers of kevlar could withstand the level 3 ballistic test, while the sample with 30 layers of kevlar could withstand the level 4."

"Pada penelitian ini, komposit hybrid laminate yang terdiri dari aluminum alloy 7075 dan Kevlar dibuat. Kevlar yang digunakan dalam pembuatan komposit tersebut diimpregnasi dengan shear thickening fluid (STF) yang mengandung partikel alumina (Al2O3) berukuran nano. STF dibuat dengan mencampurkan PEG-400, alumina dan etanol yang digunakan untuk mengimpregnasi Kevlar. Variasi jumlah lapisan Kevlar sebanyak 8,16, dan 24 lapisan dibuat untuk mengamati ketahanan balistik. Deposisi dari alumina diamati dengan scanning electron microscope (SEM) dan fourier transform infrared spectrometer (FTIR). Hasil observasi dengan menggunakan SEM menunjukkan bahwa partikel alumina berada di antara serat Kevlar dan hal ini didukung dengan hasil FTIR. Ketahanan balisitk diuji dengan beberapa metode karakterisasi, seperti pengujian balistik yang mengacu pada standar dari National Institute of Justice (NIJ) 1080.01 dengan level II. Deformasi yang dihasilkan, termasuk jejak perforasi dan kedalaman penetrasi, dianalisis untuk mengetahui kemampuan penyerapan energi. Charpy impact test juga dilakukan guna mengamati kemampuan penyerapan energi dari komposit tersebut saat terpapar impak dengan kecepatan rendah. Hasil dari pengujian balistik dan impak menunjukkan hasil serupa, yakni sampel komposit dengan 24 lapis kevlar terimpregnasi menyerap energi paling optimal yang dibuktikan dengan data kualitatif dan kuantitatif.

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In this research, hybrid laminate composites comprising of Kevlar and aluminum alloy 7075 plates were fabricated for armor application. The Kevlar fabrics were impregnated in shear thickening fluid (STF) containing alumina nanoparticles (Al2O3) to enhance the ballistic performance. STF was made by mixing PEG-400, alumina nanoparticles and ethanol which then introduced to Kevlar fabrics. A variation of Kevlar layer number of 8, 16, and 24 layers, were made to observe the ballistic resistance. The deposition of nano-filler into Kevlar fabrics was observed by scanning electron microscope (SEM) and fourier transform infra-red (FTIR) spectrometry. The results show that alumina nanoparticles exist in between individual Kevlar fibers and supported by FTIR result. Ballistic impact resistance was observed through ballistic test that was performed according to National Institute of Justice (NIJ) 1080.01 level II standard. The resulting deformations, including perforation trace and depth of penetration, were studied to determine the energy absorption behavior. Charpy impact test was also conducted to analyze the behavior of the composite in lowvelocity impact and the impact value was discussed leading to the same trend with ballistic test result, in which 24-layer impregnated sample shows the optimum energy absorption based on qualitative and quantitative data. "

"Pengembangan komposit saat ini telah banyak dilakukan, terutama pada bidang militer. Salah satunya adalah komposit aluminium dengan berbagai jenis penguat yang telah berhasil menahan proyektil dengan berbagai ketebalan. Dalam penelitian ini, komposit aluminium balistik yang dipelajari adalah komposit dengan matriks berupa AA 5083 dengan penguat kawat baja karbon tinggi dan adhesif polyurethane sebagai perekat antara matriks dan penguatnya. Komposit divariasikan dengan 3 fraksi volume kawat baja, yaitu 2.5, 5, dan 7.5% dengan kawat baja berdiameter 1.4 mm. Pengujian yang dilakukan meliputi pengujian tarik, impak dan balistik. Sehingga dapat diketahui sifat mekanis, kemampuan penyerapan energi pada komposit dan ketahanan komposit menahan proyektil. Struktur makro pasca uji balistik diamati dengan kamera beresolusi tinggi. Hasil pengujian membuktikan bahwa semakin meningkat jumlah fraksi volume kawat baja yang dipergunakan, semakin baik kemampuan komposit menahan penetrasi balistik. Pengujian menggunakan 2 jenis proyektil, 9 mm menggunakan pistol P2 PINDAD dan 7.62 mm menggunakan senapan laras panjang SPR-1. Harga impak terbesar terdapat pada sampel fraksi volume kawat 7.5% sebesar 0.68 J/mm2. Modulus elastisitas terbaik juga terdapat pada sampel berfraksi volume kawat baja 7.5% sebesar 39.2 GPa. Pada pengujian balistik, sampel dapat menahan laju proyektil pada penggunaan proyektil 9 mm, tetapi pada penggunaan proyektil 7.62 mm, proyektil berhasil menembus sampel. Pada pengamatan struktur makro, terdapat banyak void, sehingga penggunaan adhesif polyurethane tidak berfungsi secara optimum.

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Composite material has been widely used for military application. Some examples use aluminum based composite reinforce with many kind of material that can with stand penetration with many thickness. This research evaluates ballistic aluminium composite with AA5083 as the base material and reinforce with high carbon wire that is attached with polyurethane adhesive. The composite is varied by the volume friction of the wire of 2.5, 5 and 7.5%. The test include tensile, impact and ballistic testing, to study the mechanical properties and the ability of the composite to absorb energy and withstand the projectile. Ballistic fracture was observed by using high resolution camera. The result showed that the higher the fraction volume of the wire, the better the capability of the composite in holding the projectile. The highest impact value of 0.68 J/mm2 and the highest elastic modulus of 39.2 GPa was achieved by the sample with 7.5% of wire. All sample were not penetrated by 9 mm projectile from P2 gun, but on the other hand all were penetrated by 7.62 mm bullet from SPR-1 gun. Macrostructure observation showed that voids were presents in the sample, indicating that the polyurethane adhesive didn?t well function in the composite."

"ABSTRAKInteraksi yang kompleks antar lamina pada suatu laminat saat mengalami beban tarik menyebabkan perbedaan kuat tarik dan jenis kerusakan pada komposit laminat karbon/epoksi dengan susunan lamina yang berbeda. Untuk mengetahui pengaruh susunan lamina terhadap kuat tarik dan jenis kerusakan komposit laminat, 5 komposit laminat dibuat dengan metode hand lay up dengan susunan (0)5, (0/0/90)s, (0/45/-45/901/2)s, (0/45/-45/90)s dan (0/90/-45/45)s. Hasil uji tarik menunjukkan kuat tarik dari komposit laminat (0)5, (0/0/90)s, (0/45/-45/901/2)s, (0/45/-45/90)s dan (0/90/-45/45)s secara berturut-turut adalah ( 1988,97 ± 156,69 ) MPa, ( 1745,47 ± 19,53 ) MPa, ( 929,70 ± 32,79 ) MPa, ( 992,82 ± 26,63 ) MPa dan ( 941,86 ± 24,21 ) MPa. Hasil pengamatan dengan mikroskop optik pada bagian pinggir komposit laminat menunjukkan bahwa kerusakan yang terjadi pada setiap komposit laminat adalah delaminasi, retak mikro matriks dan perpatahan serat.

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ABSTRAKA complex interaction between lamina in laminate composites when receive an applied load causes different tensile strength values and types of damage on the carbon/epoxy laminate composites with different lamina stacking sequence. To know the effect of lamina stacking sequence on tensile strength value and the types of damage, five types of laminate composites were made by hand lay up method where the stacking sequence were (0)5, (0/0/90)s, (0/45/- 45/901/2)s, (0/45/-45/90)s dan (0/90/-45/45)s. The test results showed that the tensile strength value of the (0)5, (0/0/90)s, (0/45/-45/901/2)s, (0/45/-45/90)s and (0/90/-45/45)s laminates are ( 1988,97 ± 156,69 ) MPa, ( 1745,47 ± 19,53 ) MPa, ( 929,70 ± 32,79 ) MPa, ( 992,82 ± 26,63 ) MPa and ( 941,86 ± 24,21 ) MPa respectively. An observation with optical micrograph at the edge of laminate composites showed that the type of damages that occured on that laminates were delamination, matrix microcracking and fiber breakag"

"Industri pertahanan nasional khususnya kendaraan tempur membutuhkan adanya pengembangan dari sisi material untuk meningkatkan efektivitas dalam menahan serangan proyektil serta mempermudah mobilitas saat digunakan di medan perang. Pada penelitian ini, digunakan komposit laminat dengan matriks berupa plat aluminium AA5052 dan serat kevlar dengan variasi jumlah lapisan sebanyak 20, 30, dan 40 layer. Kevlar di dalam komposit laminat ini diimpregnasikan dengan campuran nanopartikel SiC (Silikon Karbida) 50nm, ethanol, dan PEG-400 sebagai Shear Thickening Fluid (STF). Plat aluminium dan kevlar direkatkan menggunakan resin epoksi dan hardener dengan metode hand lay-up. Untuk mengetahui ketahanan balistik dan sifat mekanis, dilakukan pengujian balistik level III dan IV yang kemudian dianalisis kedalaman penetrasi proyektil dan diameter perforasi dari komposit laminat. Analisis mikrostruktur dan kandungan unsur dari komposit laminat dilakukan dengan Scanning Electron Microscopy (SEM), Energy Disperse X-Ray Spectrometry (EDS), dan Fourier Transfer Infrared Spectrometry (FTIR). Hasil penelitian menunjukkan adanya pengaruh pada ketahanan balistik dan kekuatan mekanis akibat pengimpregnasian nanopartikel SiC dan variasi jumlah kevlar yang digunakan pada komposit laminat.

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The national defense industry, especially combat vehicles, requires materials development to increase effectiveness in ballistic resistant and mobility when used on the battlefield. In this study, laminated composites with a matrix of AA5052 aluminum plate and kevlar fiber were used with variations in the number of layers of 20, 30, and 40 layers. The kevlar fabric in this laminated composite was impregnated with a mixture of 50nm SiC (Silicon Carbide) nanoparticles, ethanol, and polyethylene glycol (PEG-400) as Shear Thickening Fluid (STF). The aluminum and kevlar plates are glued together using epoxy resin and hardener by the hand lay-up method. To determine the ballistic resistance and mechanical properties, level III and IV ballistic tests were carried out followed by analyzing the projectile penetration depth and perforation diameter of the laminated composite. Analysis of the microstructure and elemental content of the laminated composites was carried out by Scanning Electron Microscopy (SEM), Energy Disperse X-Ray Spectrometry (EDS), and Fourier Transfer Infrared Spectrometry (FTIR). The results showed that there was an effect on ballistic resistance and mechanical strength due to the impregnation of SiC nanoparticles and variations in the amount of Kevlar used in laminated composites."

"Material komposit merupakan salah satu jenis material yang saat ini banyak dikembangkan karena dapat menggabungkan sifat-sifat dari material yang menyusunnya. Dengan keunggulan tersebut, material komposit dapat diaplikasikan pada berbagai bidang, salah satunya untuk aplikasi balistik. Dalam penelitian ini komposit yang dikembangkan adalah komposit laminat yang terdiri dari pelat AA6061 sebagai matriks yang diperkuat dengan kawat baja karbon tinggi berdiameter 1.4 mm yang disusun satu arah dan adhesif polyurethane yang berperan untuk merekatkan fasa matriks dan penguat. Komposit tahan peluru dibuat berdasarkan metode laminasi dengan susunan kawat searah. Karakterisasi yang dilakukan berupa pengujian impak, pengujian balistik, dan pengamatan foto makro pada daerah perforasi. Pengujian balistik dilakukan berdasarkan standar NIJ 0108.01 dengan tipe proyektil berkaliber 9 mm (tipe II) dan 7.62 mm (tipe III).Pada penelitian ini juga membandingkan harga impak dan diameter perforasi antara komposit berpenguat kawat baja 1 mm yang disusun (00/900/00) dengan komposit berpenguat kawat baja 1.4 mm yang disusun satu arah. Hasil pengujian impak menunjukkan bahwa harga impak semakin meningkat seiring dengan peningkatan fraksi volume kawat. Material komposit yang dibuat memiliki ketahanan yang baik terhadap beban impak dari proyektil 9 mm, tetapi ketahanannya rendah terhadap beban impak dari proyektil 7.62 mm. Ketahanan balistik komposit penguat 1.4 mm lebih kuat dibandingkan komposit penguat 1 mm, pada pengujian balistik 7.62 mm (Tipe III NIJ 0108.01) menghasilkan diameter perforasi komposit penguat 1 mm lebih besar dibandingkan dengan komposit penguat 1.4 mm.

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Composite materials, is one of the types of materials currently being developed because it can combine the material properties that constitute them. One of the many types of developing composite is aluminum composite. This type of composite can provide good mechanical properties with low weight materials than conventional metallic material. Therefore, the aluminum composite material is very promising for the ballistic applications as bullet-proof material. In this study developed a composite consisting of laminated composite plates as matrix AA6061 reinforced with Unidirectional high carbon steel wire of 1.4 mm-Diameter and polyurethane adhesive that works to strengthen the matrix and reinforce bonding, composite variables is done by varying the volume fraction of wires that 2.5%, 5% and 7,5%. Laminate composites was made by manual lamination method, the arrangement of composite reinforced was unidirectional. The characterization was carried out by impact testing, ballistics testing, and macrograph examination on the perforation area. Ballistic testing conducted in accordance with NIJ 0108.01 standards, and the projectiles type are 9 mm (type II) and 7.62 mm (type III). In this research also compare impact value and perforation diameter between laminated composites reinforced by unidirectional high carbon steel wire of 1.4 mm-diameter with laminated composites reinforced by (00/900/00) high carbon steel wire of 1 mm-diameter The results showed that the higher the volume fraction of the wire, the higher the impact value of the laminate composite. The laminate composite was able to withstand the projectile of 9 mm calibre, but was fail under 7.62 mm projectile. Balistic resistant of composite reinforced by 1.4 mm stronger than composite reinforced by 1 mm, in balistic test with 7.62 mm (Tipe III NIJ 0108.01) produce diameter perforation of composite reinforced by 1 mm has bigger penetration than composite reinforced by 1.4 mm. "

"Salah satu kekuatan militer Indonesia yaitu Industri pertahanan nasional khususnya kendaraan tempur membutuhkan adanya modernisasi dari sisi material untuk meningkatkan mobilitas dan efisiensi penggunaan energi saat digunakan di medan perang. Namun, tidak mengurangi atau bahkan diharapkan melebihi dari kekuatan mekanis dari baja tahan peluru yang saat ini masih menjadi andalan dalam manufaktur kendaraan militer Penelitian ini akan berfokus pada komposit laminat dengan matriks logam AA7075 – T6 dengan penguat serat karbon dengan variasi adanya perlakuan pencanaian dingin pada matriks dan kuantitas serat penguat karbon yang divariasikan jumlahnya 10, 20, hingga 30 lembar. Masing-masing sampel diuji balistik pada 2 tingkatan yang berbeda, pistol dengan proyektil 9 mm dan senapan dengan proyektil 5,56 mm. Perlakuan pencanaian dingin sebesar 42% ini menunjukkan adanya peningkatan kekuatan mekanis seperti kekuatan tarik dan kekerasan pada matriks aluminium, tetapi mengurangi performa balistik komposit khususnya di level II dan level III akibat penurunan ketebalan. Penambahan serat karbon terbukti dapat meningkatkan performa balistik komposit di level II dan mengurangi terbentuknya mode kegagalan di level III. Sampel komposit berhasil menahan proyektil pada pengujian balistik dengan pistol dan proyektil 9 mm, tetapi gagal pada pengujian dengan senapan dan proyektil 5,56 mm, dengan mode kegagalan yang timbul berupa petaling, shear plugging, delamination, bulging, fiber breakage, dan crack.

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One of Indonesia's military strengths is the national defense industry, especially combat vehicles, which require modernization in terms of materials to increase mobility and efficient use of energy when used on the battlefield. However, it does not reduce or is even expected to exceed the mechanical strength of bullet-resistant steel which is currently still a mainstay in military vehicle manufacturing. This research will focus on laminated composites with an AA7075 - T6 metal matrix with carbon fiber reinforcement with variations in the cold rolling treatment of the matrix. and the quantity of carbon reinforcing fiber varied in number from 10, 20, to 30 layers thick. Each sample was tested for ballistics at 2 different levels, a pistol with a 9 mm projectile and a rifle with a 5.56 mm projectile. This 42% cold rolling treatment shows an increase in mechanical strength such as tensile strength and hardness in the aluminum matrix, but reduces the overall ballistic performance especially at level II and level III of the composite due to thickness. The addition of carbon fiber has been proven to improve the performance of composite ballistic at level II and reduce the formation of a fairness mode at level III. Composite samples succeeded in withstanding projectiles in ballistic tests with pistols and 9 mm projectiles, but failed in tests with rifles and 5.56 mm projectiles, with failure modes arising in the form of petaling, shear plugging, delamination, bulging, fiber breakage, and crack."