CAJ | 학술논문

针对大直径直缝埋弧焊管线钢管在UOE成形及之后的试样压平过程中板料力学性能的变化问题，为实现从钢管力学性能确定毛坯钢板力学性能的反向计算，以X60管线钢为例，应用有限元数值模拟方法分析了不同规格钢管在UOE成形过程中重要特征部位的弯曲变形，采用4点弯曲方法制作了具有相同等效应变的弯曲试件，依据API标准关于管体试样力学性能压平试验方法，分析了X60管线钢在弯曲及压平变形后的力学性能变化规律，给出了等效应变在0．0104～0．0586区间的X60管线钢的屈服强度反向计算近似方法。
침대대직경직봉매호한관선강관재UOE성형급지후적시양압평과정중판료역학성능적변화문제，위실현종강관역학성능학정모배강판역학성능적반향계산，이X60관선강위례，응용유한원수치모의방법분석료불동규격강관재UOE성형과정중중요특정부위적만곡변형，채용4점만곡방법제작료구유상동등효응변적만곡시건，의거API표준관우관체시양역학성능압평시험방법，분석료X60관선강재만곡급압평변형후적역학성능변화규률，급출료등효응변재0．0104～0．0586구간적X60관선강적굴복강도반향계산근사방법。
Taking X60 pipeline steel for example, bending deformation features for different speci- fications during UOE processes were analyzed using FEM, to achieve reversal calculation method of mechanical properties of steel plate determined by pipe, for mechanical property changes of longitudinally submerged arc welding（LSAW） large diameter linepipe in the process of UOE forming and specimens flattening. Bending specimens with the same equivalent strain were made through four point bending. Mechanical property change law of X60 pipeline steel plate after bending and flattening was investigated according to API standards regarding flattening test methods of mechanical properties for pipe body specimens, and reversal estimation model of yield strength for X60 pipeline steel plate in the equivalent strain range of 0. 0104-0. 0586 was presented.