Dengan meningkatnya kenaikan produksi dalam suatu industri pada umumnya akan
diikuti penurunan kualitas suatu produk dimana akan meningkatkan claim dari customer
yaitu kegagalan mekanik pada rear axle shaft yang patah pada bagian flange. Untuk itu
dilakukan pengujian agar diketahui akar penyebab kegagalan rear axle shaft truk model X
dan memberikan solusi klaim patah. Pengujian yang dilakukan mencakup pengamatan
fracture surface secara makroskopik dan mikroskopik, pengujian mekanikal properti seperti
uji tarik, pengujian komposisi kimia, pengujian kekasaran permukaan , uji Vickers / uji
kekerasan, dan perhitungan shear stress maximal. Dari pengamatan fracture surface tidak
ditemukan crack awal yang menyebakan kegagalan rear axle shaft, hasil untuk uji tarik
material didapat sult 843 (N/mm2) syield 588 (N/mm2) e = 16.30%, untuk pengujian komposisi
kimia bahan didapat hasil yaitu C (0.42-0.48), Si (0.15-0.35), S (0.03) max, P (0.03) max,
Mn( 1.35-1.65), Ni( 0.25 max), Cr (0.35 max), Cu( 0.3 max), dari hasil perhitungan shear
stress maximal memakai persamaan sehingga hasil yang didapat
≥ sult 42.15 N/m2 pada Konsentrasi tegangan Kt 1,406 dan
nilai Torsi , pada pengujian kekasaran permukaan hasil yang didapat semua ada
dalam nilai standard yaitu 3.2 RZ, pada pengujian kekerasan didapat nilai kekerasan 610 HV
dimana standard kekerasan adalah 620HV?800HV, Dari semua pengujian tidak ditemukan
penyebab kegagalan pada rear axle shaft kecuali pada nilai kekerasan sehingga disimpulkan
penyebab patah pada poros dikarenakan nilai kekerasan kurang sehingga dilakukan
perubahan parameter untuk proses hardening
AbstractIncreasing volume production in an industry in general will be followed by decline in
quality product which enhance their customer's claim such a mechanical failure on Rear Axle
shaft which fracture at the flange. The examination was done in order to know the root cause
of the failure of the truck rear axle shafts X model and provide solutions fracture claims Tests
performed include observation of fracture surface in macroscopic and microscopic, testing of
mechanical properties such as tensile test, the testing of chemical composition, surface
roughness testing, test Vickers / hardness test, and calculation of maximum shear stress.
From the observation of fracture surface was not found crack that caused the initial failure of
rear axle shafts, the result for material tensile test sult obtained 843 (N/mm2) syield 588
(N/mm2) e = 16:30%, for testing the chemical composition of the material we got the result
that C ( 0:42 to 0:48), Si (0:15 to 0:35), S (0.03) max, P (0.03) max, Mn (1.35-1.65), Ni (0.25
max), Cr (0:35 max), Cu (0.3 max). Tests performed include testing fracture surface, which is
done by macroscopic and microscopic,the result can not find crack test results early,
mechanical property testing sult obtained 843 (N/mm2) syield 588 (N/mm2) e = 16:30%,
testing the chemical composition of materials obtained results as the standard C (0:42 to
0:48), Si (0:15 to 0:35), S (0.03) max, P (0.03) max, Mn (1.35-1.65), Ni (0.25 max), Cr (0:35
max), Cu (0.3 max), the results of calculations based on the simulated shear stress values
from the equation that is ≥ Sult 42.15 N/m2
obtained maximal torque in the shaft, with a value of 1.406 Kt stress concentration results,
value of hardness testing got result 610 HV hardness but the standard 620HV-800HV, thus
found to be less than the standard. From testing concluded the cause of shaft fractures due to
the lack of hardness, so that changes the process of hardening parameters
