J4 ›› 2008, Vol. 19 ›› Issue (4): 0-401.
• 材料工程 • 下一篇
张莉;刘文晶;程靳;付德龙
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Zhang Li;Liu Wenjing;Cheng Jin;Fu Delong
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摘要：
通过二维弹塑性有限元计算得到I型静态裂纹在常幅疲劳载荷下裂纹尖端塑性应变能，进而获得裂纹尖端塑性应变能和应力强度因子幅值的非线性关系;根据能量平衡概念，建立了裂纹扩展速率与裂纹尖端塑性应变能的关系。由此得到一种基于裂纹尖端塑性应变能的疲劳裂纹扩展寿命预测模型，利用该模型预测了中心裂纹平板的疲劳裂纹扩展寿命，预测结果与试验值吻合得很好。
关键词: 裂纹扩展寿命预测;裂纹扩展速率;塑性应变能;应力强度因子
Abstract:
The total plastic strain energy of a stationary crack per cycle was calculated through 2-D elastic plastic finite element analysis under constant amplitude fatigue loading,and the nonlinear relation of total plastic strain energy with stress intensity factor range was obtained. With the energy balance concept,the relation between the crack growth rate and the total plastic strain energy per cycle was established. So a prediction model of fatigue crack growth life based on the total plastic energy was proposed,and the predictions of the model are in good agreement with the experimental results of the center-crack panel.
Key words: prediction of crack growth life;crack growth rate;plastic strain energy;stress intensity factor
中图分类号:
O346.2
张莉;刘文晶;程靳;付德龙;. 对2024铝合金疲劳裂纹扩展寿命进行预测[J]. J4, 2008, 19(4): 0-401.
Zhang Li;Liu Wenjing;Cheng Jin;Fu Delong. Prediction of Fatigue Crack Growth Life of 2024 Aluminum Alloy Based on the Plastic Energy[J]. J4, 2008, 19(4): 0-401.
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