管线钢管韧性的设计和预测

韧性的设计和预测是油气管线设计的重要内容。基于油气管线脆性断裂的防止、裂纹起裂阻力的优化和延性断裂扩展的控制,本研究对管线钢管的脆性断裂韧性、起裂韧性和延性断裂止裂韧性的设计和预测进行了分析和讨论。管线钢管的脆性断裂韧性设计以在最低运行温度下,DWTT试样85%SA作为设计和评定的标准;当进行起裂韧性设计和预测时,以最大理论临界裂纹尺寸的90%作为钢管所容忍的临界裂纹尺寸,临界裂纹尺寸所对应的韧性即为起裂韧性;天然气管道延性断裂止裂韧性设计的基本方法为Battlle双曲线方法及其简化公式。

The Design and Prediction of Line Pipe Toughness

The design and calculation of toughness is an important content in design pipeline used for transporting oil and gas.On the basis of preventing brittle fracture,optimizing resistance to fracture initiation,and controlling ductile fracture propagation,it analyzed and discussed design and prediction of brittle fracture,initiation fracture toughness and brittle fracture arrest toughness of line pipe.Under the lowest operation temperature,85% SA of DWTT is the design and evaluation standard of brittle fracture toughness,while designing and predicting initiation toughness,the 90% of the biggest theoretic critical crack size is the size which can be tolerated by steel pipe,and the corresponding toughness of critical crack size is initiation toughness.The hyperbola method and its simplified formula are the basic method to design brittle fracture arrest toughness of gas pipeline.