Abstract:
The research is to study the cause of failure of the counter shaft in a pickup truck with
a power output of 144 Hp that has been in use for 8 years, vehicle which was to adjust the
engine to increased horsepower. The counter shaft is made from JIS-SCM 420 hardened lowalloyed
steel. The experiments were divided into 2 methods: stress analysis using
Goodman's equations and finite element analysis using a torque value of 550 N.m. The
results of the analysis concluded that the maximum stress calculated by Goodman's
standard was 1,982 MPa and the safety factor was 3.56, which was close to the value
obtained in the finite element method and the ultimate tensile strength of material is 655
MPa, it can be seen that the calculated stress is 3 times greater than the ultimate tensile
strength which resulting in final counter shaft fracture. The results of the study will be able
to identify the mechanism of the damage which is consistent with the assumption of this
research and which as the information for a protection of any failure shaft