CAJ | 학술논문

以国际板料成形数值模拟会议(Numisheet2011)上提出的第四个标准考题为研究对象，应用ABAQUS对DP780高强钢板弯曲及回弹过程进行模拟。结果表明：随着网格划分尺寸减小，回弹量逐渐增大，网格密度对板料弯曲回弹量有较大的影响；随着摩擦因数的逐渐增大，回弹量先快速增大，然后缓慢减小。将得到的与试验值相匹配的网格尺寸（2.75 mm）和摩擦因数（0.1）应用于板料预变形之后再拉深弯曲过程模拟，结果发现：板料预变形之后拉深弯曲回弹量增大。将模拟值与Numisheet2011会议得到的试验值对比发现，板料弯曲模拟与试验的回弹变化趋势相同，且3个回弹表征量的模拟误差都在10%以内。
이국제판료성형수치모의회의(Numisheet2011)상제출적제사개표준고제위연구대상，응용ABAQUS대DP780고강강판만곡급회탄과정진행모의。결과표명：수착망격화분척촌감소，회탄량축점증대，망격밀도대판료만곡회탄량유교대적영향；수착마찰인수적축점증대，회탄량선쾌속증대，연후완만감소。장득도적여시험치상필배적망격척촌（2.75 mm）화마찰인수（0.1）응용우판료예변형지후재랍심만곡과정모의，결과발현：판료예변형지후랍심만곡회탄량증대。장모의치여Numisheet2011회의득도적시험치대비발현，판료만곡모의여시험적회탄변화추세상동，차3개회탄표정량적모의오차도재10%이내。
The fourth standard examination question in Numisheet2011 was taken as the re-search object, and the bending and spring-back process of DP780 high strength steel was simulated by ABAQUS. The results indicate that with the decrease of grid division dimen-sion, the spring-back value increases gradually; and the grid density has a biggish effect on the sheet metal bending spring-back value. With the gradual increase of friction coeffi-cient, the spring-back value increases quickly at the beginning and then decreases slowly. The obtained mesh size (2.75mm) and friction coefficient (0.1) which matched with the ex-perimental values were applied to the simulation of pre-stretching sheet metal forming pro-cess. The results show that the spring-back value after pre-stretching increases. Comparing the simulated values with experimental values obtained from Numisheet2011, the precision with and without pre-strain was all above 90%.