【摘要】 根据声发射测试原理,利用信号峰值电压与材料形变过程中释放能量的关系建立了裂纹开裂的声发射参数与应力关系的数学模型,提出了声发射总计数和声发射计数率的一般表达式,研制了声发射装置,并在拉伸试验条件下对具有不同缺陷的ZG25试件进行了声发射检测。实验结果表明:无缺陷的ZG25材料与有气孔、疏松、夹渣和微裂纹缺陷的该材料具有不同的声发射AE事件特征,这对金属材料声发射无损检测具有实际意义。更多还原

【Abstract】 Based on the principle of acoustic emission(AE) detection, a mathematical model between AE parameters and cracking stress from the relation of the signal peak voltage and emission energy during the deformation of material is established.A general expression between the total counts and counting rate is developed.During the tensile test,with the AE detecting system developed,it is found that the defects in ZG25 steel,such as gas pore,slag inclusion and microcrack, show different AE characteristics.Thus,AE as a nondestructive method is practically useful for metallic materials.更多还原