【摘要】 文章采用损伤力学方法对Dugdale塑性区模型进行修正,研究损伤分布对裂尖塑性区的影响。修正的塑性区模型与Dugdale模型、Irwin模型进行了比较,结果令人满意。又通过该模型,研究声发射总计数N与应力强度因子K及塑性区半径ry之间的关系,与实验结果一致。说明可采用宏观变量ry来描述声发射活动中的微观损伤变化,有利于从多角度揭示产生声发射源的机理,适于工程应用。更多还原

【Abstract】 A modified Dugdale plastic zone model is proposed using damage mechanics technique.Damage distributions in the region of crack tip are considered.Comparisons are made among the damage model,Dugdale plastic model and Irwin model.The results are satisfactory.Based on the modified model,the correlation of acoustic emission(AE) total counts N,stress intensity factor K and plastic zone size ry was made.Good agreement is observed by experiment.It is indicated that the micro-damage changes in the acoustic emission activities can be described by macro variables ry.It is beneficial from multi-aspects to reveal the source mechanisms of acoustic emission and is suited for engineering applications.更多还原