复合材料层压板S-N曲线模型的综述与评估  

Review and Evaluation of S-N Curve Models for Composite Laminates

作　　者：冯炜森 杨成鹏[1] 贾斐 FENG Weisen;YANG Chengpeng;JIA Fei(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi’an 710072,China;School of Mechano-Electronic Engineering,Xidian University,Xi’an 710071,China)

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072 [2]西安电子科技大学机电工程学院,西安710071

出　　处：《材料导报》2024年第22期278-287,共10页Materials Reports

基　　金：国家自然科学基金(12072274)。

摘　　要：S-N模型是分析预测材料及其结构疲劳寿命的重要基础。本文对复合材料层压板的S-N曲线模型进行了全面综述,并将其归纳为基于数据拟合思想的经验模型和考虑损伤机理的半经验模型。研究发现,应力比是S-N模型需要考虑的关键载荷参数,而包含应力比的半经验模型较少、经验模型更为匮乏。拟定了模型评估五个基本标准,选取了两种材料体系、不同铺层结构层合板在不同应力比条件下的八组疲劳数据,对典型S-N模型的表征能力进行了分析评估。结果表明:Weibull模型、Wu模型和Epaarachchi模型在不同疲劳影响因素下均能表现出较强的拟合能力,整体拟合精度较高,而且Weibull模型和Wu模型具有拟合S-N曲线全区间的能力;Basquin模型虽然在理论和工程中经常使用,但预测精度通常并不理想;相较于不包含应力比的模型,包含应力比的模型其表征精度通常比较差,适用范围反而受限;同时,与半经验模型相比,经验模型通常满足边界条件,对不同形式S-N曲线的拟合优度更高,适应能力更强,且适用范围更广。S-N curve model is an important basis for analyzing and predicting the fatigue life of materials and their structures.This paper presents a comprehensive review of S-N models for composite laminates,and categorizes them into empirical models from data fitting conception and semi-empirical models that consider damage mechanism.It is found that stress ratio is a key loading parameter to be considered in S-N model,while there are fewer semi-empirical models and more scarce empirical models that include stress ratio.In order to verify and evaluate those typical S-N models,five basic criteria for model evaluation were suggested,and eight sets of fatigue data were selected from two material systems with different laminated structures under different stress ratios.The results indicate that the Weibull model,Wu model,and Epaarachchi model can exhibit stronger fitting ability under various fatigue influencing factors with high overall fitting accuracy,and the Weibull model and Wu model also have the ability to fit the entire region of the S-N curve.The Basquin model,although often used in theory and engineering,is not ideal in terms of its accuracy.Compared with those models without stress ratio,the characterization accuracy of the model with stress ratio is usually poor and its scope of application is limited.Meanwhile,compared with semi-empirical model,the empirical model is easier to meet the boundary conditions,has a better fit to different forms of S-N curves,is more adaptable,and has a wider scope of application.

关 键 词：复合材料层压板 疲劳 寿命预测 S-N模型 模型评估 

分 类 号：TB332[一般工业技术—材料科学与工程]