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总览 评价 郭凤明 1， ， 冯淼林 2， ， 许金泉 2，* （ 1、 上海交通大学工程力学系； 2、 Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240； ） 摘要： 从特征疲劳长度概念出发，提出一个新的有限疲劳寿命预测模型
郭凤明1，， 冯淼林2，， 许金泉2，*
（
1、上海交通大学工程力学系； 2、Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240； ）
摘要：
从特征疲劳长度概念出发，提出一个新的有限疲劳寿命预测模型，并以该模型为基础，对材料内二维和三维的不同形式的缺陷进行了探讨。分析发现，该模型不仅能够适用于常见的光滑材料和带有宏观缺陷的材料，还能够被应用到产生了尺寸效应问题的微小缺陷上。通过对含有不同尺寸微小圆孔的SUS 630钢在室温下应力控制的疲劳试验，用该模型进行了疲劳寿命预测，预测结果与实测结果符合较好。
关键词：
固体力学；疲劳；尺寸效应；特征长度；寿命预测；SUS630
GUO Fengming， FENG Miaolin， XU Jinquan*
（
Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240； ）
Abstract：
This paper is concerned with the finite fatigue lives of high strength steel SUS 630 H900 taking various defects under high cycle loading in two dimensions (2D) and three dimensions (3D). SUS 630 H900 steel has the extensive applications with specific fatigue features. The related defects refer to long cracks/notches as well as small cracks/notches. The small cracks/notches generally give rise to the size effect on material fatigue strengths and lives. In order to address the size effect, the characteristic fatigue length concept, accounting for the minimum representative size of polycrystalline material under cyclic loadings, is selected to correlate the fatigue lives with the average stress amplitude within the length. In this concept, the characteristic fatigue length is considered as the material intrinsic property and does not vary with the number of cycles to failure. Based on the length, The finite fatigue lives of SUS 630 H900 with various defects are predicted and partially compared with the experimental results. Through the comparison it is found that, the predicted values agree with the experimental results well.
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