CAJ | 학술논문

针对钢结构在外力作用下由于自身材料断裂韧度不足引起的断裂事故，按照Wells提出的CTOD断裂判据，建立X80钢薄板在受外载作用下的力学模型，并对其断裂韧度的安全性进行了评估。在裂纹体受载后，对原裂纹尖端垂直于裂纹方向的裂纹尖端张开位移δ进行了有限元计算，提出了K-δ方法、 COD-δ方法和J-δ方法等有限元计算方法，且与断裂力学理论计算的δ结果误差极小。同时对X80钢断裂韧度按照BS 7448规范进行了测试，裂纹尖端张开位移的有限元计算方法和断裂韧度测试结果可供企业和科研院所参考。
침대강결구재외력작용하유우자신재료단렬인도불족인기적단렬사고，안조Wells제출적CTOD단렬판거，건립X80강박판재수외재작용하적역학모형，병대기단렬인도적안전성진행료평고。재렬문체수재후，대원렬문첨단수직우렬문방향적렬문첨단장개위이δ진행료유한원계산，제출료K-δ방법、 COD-δ방법화J-δ방법등유한원계산방법，차여단렬역학이론계산적δ결과오차겁소。동시대X80강단렬인도안조BS 7448규범진행료측시，렬문첨단장개위이적유한원계산방법화단렬인도측시결과가공기업화과연원소삼고。
Aiming at the fracture accidents of steel structures caused by inadequate toughness of material under external forces,the security of the fracture toughness for the mechanical model of X80 thin steel plates under external forces was analyzed in accordance with Wells’ CTOD fracture criteria.For post-loaded crack,the crack tip opening displacement δperpendicular to the direction of crack within the original crack tip was calculated by finite element method.The K-δ method ,COD-δ method and J-δ method were presented,and the results are identical to the theoretical calculated results in fracture mechanics.Therefore the finite element calculating results have a high precision.The fracture toughness of X80 steel was tested according to BS 7448.The result for fracture toughness and finite element method of calculating crack tip opening displacement can be referred by enterprises and scientific research institutions.