本文针对船用复合材料应力峰值点附近应力梯度对疲劳寿命的影响，提出一种基于应力场强法的疲劳寿命预测方法。鉴于一维应力场强法在复合材料疲劳预测方面存在精度不足的问题，提出一种改进的二维应力场强法（ETEVM）。基于多组AS4/PEEK单向纤维板在各种角度下的疲劳寿命实验数据，同时，根据已有的疲劳寿命预估铺层角公式预测几种角度单向板的疲劳寿命，并和场强法进行对比。结果表明，设计的ETEVM预测精度最高，预测误差在2倍误差带之间。
This study proposes a fatigue life prediction method based on the stress field strength method for the effect of stress gradient on fatigue life near the peak stress point of marine composites. Given that the lack of accuracy of the one-dimensional stress field strength method in the fatigue prediction of composite materials, we propose an improved two-dimensional stress field strength method.Based on several sets of experimental data on the fatigue life of AS4/PEEK unidirectional fiber boards at various angles, meanwhile, we predict the fatigue life of unidirectional boards at several angles based on the existing formula for fatigue life prediction of the layup angle, and compare it with the field strength method. The results show that the designed ETEVM has the highest prediction accuracy, and the prediction error is between twice the error band.
2025,47(1): 18-23 收稿日期：2024-3-1
DOI：10.3404/j.issn.1672-7649.2025.01.004
分类号：U664.12
基金项目：国家自然科学基金资助项目（52305110）
作者简介：蒋寒斌(1998-),男,硕士研究生,研究方向为材料疲劳寿命行为
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