CAJ | 학술논문

采用“镜像”和“剖分－契合”等方法，对SH波作用下半空间孔边界面裂纹的动应力问题进行了研究。首先，采用“镜像法”，将半空间镜像为全空间，构造出满足边界条件的散射波场；其次，借助“剖分－契合”方法和“裂纹切割”技术，将全空间沿界面分割成两个半空间求解后，再由界面应力位移连续“契合”条件组合成全空间，建立起求解该问题的积分方程组；最后，对界面裂纹端点的动应力强度因子（DSIF）进行数值分析。分析结果表明：适当地避开入射波波数、入射角度及裂纹长度等最不利影响因素的组合，可达到降低裂纹尖端点动应力的目的。
채용“경상”화“부분－계합”등방법，대SH파작용하반공간공변계면렬문적동응력문제진행료연구。수선，채용“경상법”，장반공간경상위전공간，구조출만족변계조건적산사파장；기차，차조“부분－계합”방법화“렬문절할”기술，장전공간연계면분할성량개반공간구해후，재유계면응력위이련속“계합”조건조합성전공간，건립기구해해문제적적분방정조；최후，대계면렬문단점적동응력강도인자（DSIF）진행수치분석。분석결과표명：괄당지피개입사파파수、입사각도급렬문장도등최불리영향인소적조합，가체도강저렬문첨단점동응력적목적。
The dynamic stress responses of interface cracks originating at an hole in a half-space to SH-wave were studied using the methods of‘image’and‘partitioning-conjunction’.Firstly,the half space was imaged into a full space and a scattering wave field satisfying boundary conditions was constructed with the method of‘image’.Secondly,with the help of the ‘partitioning-conjunction’method and ‘crack-division’technique,the solving domain was divided into two parts along the interface,the two sub-domains satisfying the continuous ‘conjunction’conditions of displacement and stress on the interface were conjoined,and a group of integral equations were built to solve this problem.Finally,the dynamic stress intensity factor of the interface crack tip was analyzed with the numerical method.Numerical results demonstrated that the purpose of reducing crack tip's dynamic stress can be achieved by properly avoiding the combination of the most adverse effect factors,such as,incident wave number,incident angle,and crack length,etc.