基于青藏线实测载荷的半挂车疲劳寿命预测

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中图分类号：U467.18；U469.53 文献标志码：B

Fatigue life prediction of semi-trailer based on measured load on Qinghai-Tibet route

XU Gang1，ZHOU Xinyue1，BAO Wenshuai2

（1. School of Automotive Studies， Tongji University，Shanghai 2O1804，China ； 2.Central R&D Center，BaoShan Iron & Steel Co.，Ltd.，Shanghai 2O190O，China）

Abstract： To study the durability performance of a mainstream semi-trailer body，a real road test on the Qinghai-Tibet route is carried out to measure the key acceleration，displacement and strain signals.The sections of the route which have a greater impact on the semi-trailer fatigue life are identified.After that， a virtual test bench for the semi-trailer is established. Using the measured acceleration signals at the axle head and saddle，virtual iterations are carried out to obtain the drive signals for the rig and derive the external load excitation for the semi-trailer body.Finally，the fatigue lifeof the body and its seam welds is calculated.The results show that it is feasible to analyze vehicle fatigue using the technical route of combining the actual road measurement with the virtual test.Thefatigue life of semi-trailer and welds on critical position calculated based on this scheme meets their durability design requirements.

Key words： load spectrum； semi-trailer； fatigue；weld fatigue；virtual test； virtual iteration；pseudo damage

0引言

在绿色低碳发展的时代大背景下，轻量化是汽车设计研发过程中的一个重要议题。（剩余4911字）