钢质管道弯曲破坏时材料曲线的确定试验

Experimental Research on Determination of Material Curve of Steel Pipe during Bending Failure

依据ASTM-A370-13规范,对API 5LX52无缝管道钢进行了单轴拉伸试验。得到了不同取样形式下拉伸试样的应力-应变关系曲线,据此分析拉伸试样取样形式对材料特性的影响规律。利用数值仿真软件ABAQUS,以得到的材料应力-应变关系曲线作为有限元计算输入曲线,对复杂荷载作用下X52管道全尺寸弯曲破坏试验进行数值模拟并与试验结果进行对比。结果表明:采用轴向圆棒试样对应的材料曲线得到的数值计算结果与试验结果吻合最好,该取样形式下的材料曲线可以更加准确地表达钢质管道弯曲破坏时的材料特性。

Uniaxial tensile tests of API 5L X52 seamless pipeline steel were carried out according to ASTM-A370-13 standard.The stress-strain curves of the tensile specimens of different shapes were obtained,and the influence of the specimen shape on the material properties was analyzed.Using the stress-strain curves obtained above,the full scale bending failure test of the X52 pipeline under complex loads was simulated by ABAQUS.The numerical results were compared with the experimental results.It shows that the numerical results obtained by using the stress-strain curve of longitudinal round specimen are in good agreement with the experimental results.It can be concluded that the stress-strain curve of the longitudinal round specimen is more accurate to represent the true material properties of steel pipe during bending failure.