CAJ | 학술논문

对带有初始裂纹的毛竹径向试样进行断裂韧性（KIC）试验，并从三个位置、两个方向研究了毛竹的径向断裂行为。结果表明：毛竹径向断裂韧性呈梯度变异性，预制裂纹方向不同也会影响毛竹径向断裂韧性。预制裂纹方向从竹青往竹黄侧开口时，竹青处断裂韧性平均值为4.93 MPa·m1/2、竹肉处平均值为4.07 MPa·m1/2、竹黄处平均值为2.61 MPa·m1/2。而当预制裂纹方向为从竹黄往竹青侧开口时，断裂韧性值提高，原因是被破坏点的方向偏向较强的一面，这时竹青处断裂韧性平均值为6.56 MPa·m1/2、竹肉处平均值为4.62 MPa·m1/2、竹黄处平均值为2.77 MPa·m1/2。
대대유초시렬문적모죽경향시양진행단렬인성（KIC）시험，병종삼개위치、량개방향연구료모죽적경향단렬행위。결과표명：모죽경향단렬인성정제도변이성，예제렬문방향불동야회영향모죽경향단렬인성。예제렬문방향종죽청왕죽황측개구시，죽청처단렬인성평균치위4.93 MPa·m1/2、죽육처평균치위4.07 MPa·m1/2、죽황처평균치위2.61 MPa·m1/2。이당예제렬문방향위종죽황왕죽청측개구시，단렬인성치제고，원인시피파배점적방향편향교강적일면，저시죽청처단렬인성평균치위6.56 MPa·m1/2、죽육처평균치위4.62 MPa·m1/2、죽황처평균치위2.77 MPa·m1/2。
Fracture toughness tesing of moso bamboo radical specimen with initial cracks are conducted and radial fracture behavior of moso bamboo is studied from three positions and two directions. The results indicate that the radical fracture toughness of moso bamboo shows gradient variability and that different pre-crack directions can also affect the radical fracture toughness of moso bamboo. When the pre-crack is openned from out-layer to inner-layer,the KIC of out-layer is 4.93 MPa·m1/2;the middle is 4.07 MPa·m1/2 and the inner-layer is 2.61 MPa·m1/2. When the pre-crack is openned from inner-layer to out-layer, the KIC is higher because damaged point is on the stronger side. In this case,the KIC of out-layer is 6.56 MPa·m1/2;the middle is 4.62 MPa·m1/2 and the inner-layer is 2.77 MPa·m1/2.