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.
A new idea that the distribution movement of electric charge in the crack tip end being associated with concrete fracture propagation produce electromagnetic emission is brought up. According to the theory of the fracture mechanics, the relation between initial length of crack and velocity and/or acceleration of crack propagation has been derived and calculated. Based on the electromagnetic 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.
出处
《华中科技大学学报（城市科学版）》
CAS
2005年第3期29-31,共3页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金资助项目(5020901350238040).
关键词
混凝土
断裂
电磁发射
concrete
fracture
electromagnetic emission
