CAJ | 학술논문

用三点弯曲法研究带有初始裂纹的毛竹弦向的I型断裂行为。利用COD规测量试件的裂纹张开位移，确定试件裂纹尖端的扩展位移，得到载荷-位移曲线，并利用刚度割线法确定临界载荷PQ 的值，测定竹材的断裂韧性。结果表明：毛竹具有良好的断裂韧性，本实验中测得KIC平均值为17．10 MPa· m1/2。在显微镜下观察裂纹破坏模式，可知裂纹扩展并不是按照既定裂纹开口方向，而会沿纤维界面扩展。
용삼점만곡법연구대유초시렬문적모죽현향적I형단렬행위。이용COD규측량시건적렬문장개위이，학정시건렬문첨단적확전위이，득도재하-위이곡선，병이용강도할선법학정림계재하PQ 적치，측정죽재적단렬인성。결과표명：모죽구유량호적단렬인성，본실험중측득KIC평균치위17．10 MPa· m1/2。재현미경하관찰렬문파배모식，가지렬문확전병불시안조기정렬문개구방향，이회연섬유계면확전。
We studied the moso bamboo with initial crack of typeI by three point bending method.With COD gauge, we meas-ured the crack opening displacement to determine the crack tip extended displacement of the specimen and correct the in-dentation.We got a load-displacement curve and PQ by stiffness correction method.The bamboo has good fracture tough-ness, and the average is 17.10 MPa· m1/2 .Under the microscope, the crack propagation is not established in accordance with the crack opening direction and can extend along the fiber interface.