随机疲劳下复合材料剩余刚度-剩余强度关联模型及寿命预测  

Residual Stiffness-Residual Strength Correlated Model and Life Prediction of Composite Materials under Random Fatigue Loading

作　　者：李友明 景昭[2] 吴增文 李冰垚 刘琛 葛敬冉 梁军 LI Youming;JING Zhao;WU Zengwen;LI Bingyao;LIU Chen;GE Jingran;LIANG Jun(Institute of Advanced Structure Technology,Bejing Intitute of Technology Beiing 100081,China;Bejjing Institute of Space Long March Vehicle,Bejjing 100076,China;Robotics Institute,Ningbo University of Technology,Ningbo 315211,China)

机构地区：[1]北京理工大学先进结构技术研究院,北京100081 [2]北京航天长征飞行器研究所,北京100076 [3]宁波工程学院机器人学院,宁波315211

出　　处：《强度与环境》2024年第1期23-30,共8页Structure & Environment Engineering

基　　金：国家自然科学基金(12102215,U20B2002);浙江省自然科学基金(LQ21A020001)。

摘　　要：剩余刚度和剩余强度作为描述复合材料疲劳损伤程度最常见的方法,在应用过程中都存在各自的优缺点。刚度试验成本低,但缺少明确的失效判据使得其实际工程中的应用受到限制,强度虽然存在天然的失效判据,但破坏性试验导致试验成本较高。考虑复合材料结构大多在随机交变载荷下服役,如噪声、振动等。本文通过复合材料常幅疲劳数据推导了随机疲劳下的剩余强度曲线,提出了一种随机载荷下的剩余刚度-强度关联模型,减少了试验时间和成本,并通过关联模型预测了结构随机疲劳寿命,预测值与试验值具有较好的一致性。Residual stiffness and residual strength,as the most common methods to describe the fatigue damage degree of composite materials,have their own advantages and disadvantages in application.The cost of stiffness experiment is low,but the lack of clear failure criterion limits its application in practical engineering.Although there is a natural failure criterion for strength,destructive experiment leads to high cost of experiment.At the same time,it is considered that most composite structures are in service under random alternating loads,such as noise and vibration.In this paper,the residual strength curve under random fatigue is derived from the constant amplitude fatigue data of continuousfiber reinforced composites.A residual stiffness-strength correlated model under random loading is proposed,which reduces the experimental time and cost.The fatigue life of the structure is predicted by the correlated model,and the predicted value is in good agreement with the experimental value.

关 键 词：复合材料 随机疲劳 剩余强度 剩余刚度 疲劳寿命 

分 类 号：V415.5[航空宇航科学与技术—航空宇航推进理论与工程]