CAJ | 학술논문

金刚石复合片(PDC)钻头钎焊裂纹尖端两侧临近界面处应力高度集中，是导致其断裂失效的主要原因。基于ANSYS 对PDC钻头钎焊裂纹进行数值模拟，针对焊缝裂纹形状、厚度、位置的不同，能对裂纹尖端应力场等值线图及应力强度因子进行数值计算。借助这一计算 PDC 焊缝裂纹应力强度因子的新方法，阐述了PDC断裂失效机理，用以指导钻头焊接工艺，稳定和提高 PDC 钻头焊接质量。
금강석복합편(PDC)찬두천한렬문첨단량측림근계면처응력고도집중，시도치기단렬실효적주요원인。기우ANSYS 대PDC찬두천한렬문진행수치모의，침대한봉렬문형상、후도、위치적불동，능대렬문첨단응력장등치선도급응력강도인자진행수치계산。차조저일계산 PDC 한봉렬문응력강도인자적신방법，천술료PDC단렬실효궤리，용이지도찬두한접공예，은정화제고 PDC 찬두한접질량。
Highly concentrated stress near the interface on both sides of brazing seam tip is the main reason for fracture failure of polycrystalline diamond compact (PDC) bits. On the basis of ANSYS, numeric simulation was conducted for brazing crack of PDC bit. Aiming at different shape, thickness and position of brazing seam, stress field contours and stress intensity factors were calculated at the tip of cracks. With aide of this new method for calculation of stress intensity factor, the paper described the mechanism of PDC fracture failure to guide the weld-ing process, stabilize and improve the quality of welding PDC bits.