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文章考虑损伤效应,研究材料疲劳过程损伤特征及相对应的声发射活动性。导出的疲劳损伤演化方程具有与声发射活动相似的Paris公式形式,发展了研究裂纹声发射活动的损伤力学方法。又通过分析损伤对塑性区尺寸的影响,提出塑性区损伤修正模型。采用该修正模型的预测结果与实验结果基本吻合。并以声发射参数为损伤变量提出声发射活动中的损伤发展规律。经试验数据分析,文中提出的塑性区修正模型可以较好地反映声发射活动规律,损伤发展规律符合试验观察结果。
The article considers the damage effect and studies the damage characteristics of the material during the fatigue process and the corresponding acoustic emission activities. The derived fatigue damage evolution equation has the Paris formula form similar to the acoustic emission activity, and the damage mechanics method for studying the acoustic emission activity of the crack has been developed. By analyzing the influence of damage on the size of plastic zone, a plastic zone damage correction model is proposed. The prediction results using this modified model are in good agreement with the experimental results. The acoustic emission parameters were taken as damage variables to propose the rule of damage development during acoustic emission. Based on the experimental data, the plastic zone correction model presented in this paper can well reflect the law of acoustic emission and the law of damage development accords with the experimental observation.