A study on the Fatigue Life for a composite material of Vehicles.-The development of lightweight body by using composites

摘要

This paper introduces a test and analysis study on the woven glass and carbon fabric/epoxy laminate composite and sandwich panels applied to mid-size bus vehicle. Mechanical properties of core and composite materials are needed for accurate analysis of the sandwich composites. Elastic modulus, shear modulus and Poisson’s ratio of GFRP, CFRP and core material were obtained from the tension, shear and bending specimens test. Also, fatigue strength (Se) is established from the fatigue test using the staircase method that is one of the statistical method. The fatigue test was conducted using a tension-tension load with a stress ratio R of 0.1 and frequency of 10 Hz. In order to do FE model verification and to evaluate the structural behavior and safety of the joint structure of side panel, the static load tests such as vertical load and compressive load and torsion load tests have been conducted. Finally we achieve a lighter mid-bus structure satisfying the target stiffness, strength and durability, and this technique will be applicable to other vehicles and components.