CAJ | 학술논문

为了研究断裂力学问题中裂纹尖端区域的局部变形场和断裂特性，采用数字梯度敏感法对带有中心贯穿裂纹的有机玻璃有限宽板条进行了静态实验研究。实验过程中通过CCD记录裂纹尖端区域不同应力状态下的散斑图，对记录的散斑图进行相关运算，得到了不同应力状态下裂纹尖端周围区域内的光线偏转角，并通过偏转角对Ⅰ型裂纹的应力强度因子进行了提取。结果表明，通过数字梯度敏感方法计算得到的应力强度因子与理论值吻合相对较好。
위료연구단렬역학문제중렬문첨단구역적국부변형장화단렬특성，채용수자제도민감법대대유중심관천렬문적유궤파리유한관판조진행료정태실험연구。실험과정중통과CCD기록렬문첨단구역불동응력상태하적산반도，대기록적산반도진행상관운산，득도료불동응력상태하렬문첨단주위구역내적광선편전각，병통과편전각대Ⅰ형렬문적응력강도인자진행료제취。결과표명，통과수자제도민감방법계산득도적응력강도인자여이론치문합상대교호。
In order to study the local deformation field of crack tip and fracture characteristics in fracture mechanics , static fracture tests of the limited-width polymethyl methacrylate specimen with center-crack were carried out with digital gradient sensing method .Speckle patterns under different states of stress near the crack tip were recorded by CCD in the experiment .Angular deflection was obtained by digital image correlation method and stress intensity factor in mode Ⅰcrack was extracted by angular deflection . It shows that the stress intensity factor calculated by digital gradient sensing measurement method is consistent with theoretical results .