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Monocoque Vehicle Body-In-White Life Evaluation Using Torsion Endurance Test on Rig

机译：单胶质式车身使用钻机耐力试验的白寿命评价

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摘要

In an automotive product development environment, identifying the premature structural failures is one of the important tasks for Body-In-White (BIW), sub-assemblies and components. The integrated car body structure i.e. monocoque structure, is widely used in passenger cars and SUVs. This structure is subjected to bending and torsional vibrations, due to dynamic loads. Normally the stresses due to bending are relatively small compared to stresses due to torsion in Body-In-White under actual road conditions [1]. This paper focuses on evaluating the life of Body-In-White structures subjected to torsional loading. An accelerated test method was evolved for identifying failure modes of monocoque BIW by applying torsion fatigue. The observation of the crack generation and propagation was made with respect to a number of torsion fatigue cycles. Location correlation was carried out by comparing failure modes of BIW at laboratory test and failure modes of BIW at vehicle level accelerated test arising due to BIW torsion. The road testing requires longer time and greater costs than laboratory testing [1]. In vehicle development process, BIW is developed at an earlier stage. By applying the generic load cycle, the weaker zones and failure modes of Body-In-White (BIW) can be identified at an early stage of vehicle development process and thereby reduce iterations.
机译：在汽车产品开发环境中，识别过早的结构故障是正品（BIW），子组件和组件的重要任务之一。综合车身结构即单胶质结构，广泛用于乘用车和SUV。由于动态载荷，这种结构受到弯曲和扭转振动。通常，由于弯曲导致的应力与由于在实际的道路条件下的身体上的扭转引起的应力相比[1]。本文侧重于评估经受扭转载荷的白色结构的寿命。通过施加扭转疲劳来演化加速试验方法，用于识别单胶合BIW的故障模式。对多种扭转疲劳循环进行裂缝产生和繁殖的观察。通过比较PIW扭转引起的车辆水平加速试验的实验室试验和BIW衰竭模式的BIW失效模式来执行位置相关性。道路测试需要比实验室检测更长的时间和更高的成本[1]。在车辆开发过程中，BIW在较早的阶段开发。通过应用通用载荷周期，可以在车辆开发过程的早期阶段识别身体固定性（BIW）的较弱区域和失效模式，从而降低迭代。

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