Simulation of the effect of energy absorption on crashbox with full crash initiator and without crash initiator

Suprayitno³

2021

JMEST

Self Cite

A failure happens within the camshaft of the minibus when the vehicle is in utilize. The camshaft was a fracture within the bearing between the primary cylinder exhaust valve and the second cylinder suction. This simulation aims to find the causes of camshaft failure utilizing the finite element method with a static structural approach, including simulations of deformation, strain, stress, fatigue life (stress-life and strainlife), and cracks. The method used in this paper is the finite element method with a static structural approach by ANSYS software. The camshaft material is a gray cast iron designed using Solidworks. Pre-processing includes meshing with a size of 3 mm. The value of loading force (1348.28 N) and torque (113400 Nmm) are fixed, and the boundary conditions are varied. Processing includes the process of computation and postprocessing into a part that displays the results. The simulation results show that for all the deformation and strain values that are in the elasticity area of the material, the maximum and minimum stress which is below the strength of the material, the location of the maximum values of deformation, strain, and stress is not at the fault location. The simulation of fatigue life both in stress-life and strain-life results in infinite cycles, which is above 10 6 cycles, while the simulation of cracks results in a decrease in the cycle. Based on the simulation results with the above parameters to the camshaft, it was found that a failure was caused by a defect characterized by reduced fatigue life at the same loading conditions.

Section: Introductionmentioning

confidence: 99%

Camshaft Failure Simulation with Static Structural Approach

Prasetya¹,

Suprayitno³

2021

JMEST

Self Cite

Kijang LGX camshaft’s failure analysis using the finite element method approach

Prasetya

IOP Conf. Ser.: Mater. Sci. Eng.

2021

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.

Coil spring type analysis using the finite element method

Ananto

IOP Conf. Ser.: Mater. Sci. Eng.

2021

Manoeuvre ability and driving comfort are the most important things in the automotive sector. Spring is a fundamental mechanical element that widely used in vehicle suspension applications. Holds loads perpendicular and absorbs shock loads from wheel vibrations so that they are not transmitted directly to the chassis. Therefore, the coil spring was made from a coil of high carbon steel rods in the form of a coil. The purpose of this article was to determine the differences in stress and strain strengths of several different types of coil springs. The types of springs used include the constant pitch spring, variable pitch spring, and barrel coil spring. Various types will be designed using Inventor software while the simulation used ANSYS 19.2 software. ANSYS engineering data used SUP 9 material and was subjected to a load of 6315 N. The results of the analysis showed that among the other three types, barrel coil spring has the lowest equivalent stress and maximum shear stress of 509.72 and 293.41 MPa, respectively, so it has the highest strength.