NM450TP耐磨高强钢板弯曲开裂的极限应变与数值模拟分析  

Ultimate strain and numerical simulation analysis of bending cracking of NM450TP abrasion-resistant steel plate

作　　者：李冠楠 周银 郑宇 王旭 杨帆[1] 温彤[1] LI Guan-nan;ZHOU Yin;ZHENG Yu;WANG Xu;YANG Fan;WEN Tong(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Technical Center,Handan Iron and Steel Group Co.,Ltd.,Handan,Hebei 056015,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]河钢集团邯钢公司技术中心,河北邯郸056015

出　　处：《模具工业》2022年第10期1-6,共6页Die & Mould Industry

基　　金：重庆市基础研究与前沿探索专项项目(cstc2020jcyjmsxmX0420)。

摘　　要：分析了NM450TP耐磨高强钢板弯曲及开裂的断面特征,利用DIC法获取了弯曲开裂应变;通过有限元逆向优化法得到了NM450TP耐磨高强钢的材料本构方程,并将其用于弯曲过程的FEM分析。结果表明,NM450TP耐磨高强钢板弯曲开裂断口具有明显缩颈与剪切的复合断裂特征,微观上存在微孔聚合型的韧性和解理混合断裂形式;采用基于DIC的断裂应变和优化的本构方程,能准确预测NM450TP耐磨高强钢板的弯曲开裂现象,真实反映裂纹的萌生、扩展行为以及最终形态。The section characteristics of bending and cracking of NM450TP abrasion-resistant steel plate were analyzed,and the bending cracking strain was obtained by DIC method.The material constitutive equation of NM450TP wear-resistant high strength steel was obtained by finite element reverse optimization method and used for FEM analysis of bending process.The results showed that the bending cracking of NM450TP abrasion-resistant steel had obvious composite fracture characteristics with neck shrinkage and shear,and there was a mixed fracture form of toughness and cleavage of microporous polymerization.The bending cracking phenomenon of NM450TP wear-resistant steel plate could be accurately predicted by fracture strain based on DIC and optimized constitutive equation,and the initiation,propagation behavior and final shape of the crack were truly reflected.

关 键 词：弯曲 耐磨钢 开裂 数值模拟 DIC 

分 类 号：TG76[金属学及工艺—刀具与模具] O242.21[理学—计算数学]