CAJ | 학술논문

针对设备构件裂纹尖端处的奇异现象，利用等效扭转线弹簧模拟裂纹，建立了基于ANSYS软件的裂纹梁有限元模型。利用断裂力学理论，推导了不同裂纹相对位置和相对深度下弹簧等效刚度计算式，应用该有限元模型分析了裂纹几何参数（相对位置和相对深度）的改变对梁固有频率的影响，并给出了数值模拟计算的实例。
침대설비구건렬문첨단처적기이현상，이용등효뉴전선탄황모의렬문，건립료기우ANSYS연건적렬문량유한원모형。이용단렬역학이론，추도료불동렬문상대위치화상대심도하탄황등효강도계산식，응용해유한원모형분석료렬문궤하삼수（상대위치화상대심도）적개변대량고유빈솔적영향，병급출료수치모의계산적실례。
According to the components of the singular phenomenon at the crack tip ,equivalent torsion spring element simulation of crack was used to establish the finite element model of cracked beam that is based on ANSYS software .A fracture mechanics theory was used to deduce equivalent spring stiffness calculation type of the crack in different relative position and depth , and this finite element model was used to analysis the geometric parameters of relative position and depth which changed influence on the natural frequency .The numerical examples verified the correctness of the algorithm ,w hich provides the theory basis for crack damage identification .