J-Integral under Transient Temperature State

천이온도 상태에서의 J적분

For the cracked plate under transient temperature distribution, J-integral is expressed in the form of line integral by using convolution integral. The J$_{1}$ integral is calculated for a through line center cracked steel plate under thermal and mechanical loading conditions and the calculated values are in good agreement with previous results. The effect of inertia term on the J$_{1}$ integral is not negligible for a glass but for a steel. For the glass plate, the rates of J$_{1}$ integral value to time increase if the values of material properties such as specific heat, thermal conductivity, thermal diffusivity and Young`s modulus as well as crack length and temperature difference in cracked edge increase.

본 연구에서는 천이온도하에 있는 물체의 균열의 거동을 연구하기 위하여 선 적분 형태의 J적분을 유도하고 유한요소법으로 수치계산하여 기존의 결과와 비교한다. 한편 관성항과 재료의 물성치가 J적분값에 미치는 영향을 검토한다.