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The simulations on hip joint implants aim to analyze the total deformation, maximum principal stress, and maximum shear stress with variations in time and motion activity (walking, jumping, and descending stairs). The method used in this simulation consists of design using Autodesk Inventor 2014 software, input material and properties, determining fix support, meshing, walking, and results using ANSYS 18.1 software. Finite element method analysis is based on walking, jumping, and descending stairs for 0 seconds to 0.45 seconds. The analysis showed that the hip joint implant produced 8333 nodes, 4534 elements, and total deformation of 0.39 mm (walking), 0.80 mm (jumping), and 0.90 mm (descending stairs). The maximum principal stresses are 192 MPa (walking), 397 MPa (jumping), and 438 MPa (descending stairs). The maximum shear stresses are 125 MPa (walking), 264 MPa (jump), and 291 MPa (descending stairs).

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The failure occurred in the camshaft of the minibus vehicle after 14 years of use and a failure analysis was carried out to find the cause. The purpose of this paper is to simulate a failed camshaft by evaluating stress and fatigue using the ANSYS structural static approach to find the cause of the failure. Camshaft meshed with a size of 5 mm for the outer part of the fracture and 3 mm on the fracture. The load given is force (1400 N) and torque (113 Nm) and the support is fixed support on the second bearing. The stress shows that the applied load does not because fracture based on the theory of maximum normal stress and Mohr's criteria, the location of the highest and lowest stresses is not in the fault area, and fatigue life without defects produces infinite cycles or will not fail, and fatigue life simulation with defects results in a reduction in life. Based on these parameters, failure is caused by defects in the fractured part with an indication of the location of the fracture beyond the greatest potential for fracture and lower fatigue life.

The camshaft on the Kijang LGX was broken after 14 years of use. This study aims to determine causes of camshaft fracture using finite element approach. The software used is Solidworks and ANSYS 17.0 for FEM simulation. The results to be obtained from the simulation results are stress, strain, and deformation which are then analyzed. The results showed that the greatest stress occurred in the fillet section where the area with highest stress concentration was 168.93 MPa. This value is smaller than the compressive strength so that the applied stress is within the limits of the strength of the material. Maximum stress location is 7 mm away from the fracture site (53.17 MPa), therefore the stress is not the main cause of the camshaft fracture and it can be assumed that there is a defect. The maximum strain is located at the same location as the maximum stress which is 0.0015361 mm/mm. The maximum deformation value is 0.016741 which is far from the fracture (located at the end of the cam). This value is included in the elastic deformation of the material so that the load applied to the camshaft does not change shape / does not lead to plastic deformation that triggers the appearance of cracks.