【摘要】 对混凝土断裂时的电磁发射现象进行了理论研究,研究表明:混凝土断裂电磁发射是由于裂纹尖端电荷随着裂纹的加速扩展运动而产生.应用断裂力学理论分析了混凝土断裂时初始裂纹长度与裂纹扩展加速度之间的关系,并对影响裂纹扩展速度和加速度的相关因素进行了分析.根据实验结果,利用电磁学理论,分析了由于裂纹尖端电荷的加速运动所激发的电磁场强度及其频谱特性.更多还原

【Abstract】 A new idea that the distribution movement of electric charge in the cr ack tip end being associated with concrete fracture propagation produce electrom agnetic emission is brought up. According to the theory of the fracture mechanic s,the relation between initial length of crack and velocity and/or acceleratio n of crack propagation has been derived and calculated. Based on the electromag netic theory the relation between the acceleration movement of electric charge in the crack tip end, the value of electromagnetic field and the spectrum are analyzed.更多还原