建筑钢材GTN损伤模型参数识别

发布时间：2018-02-26 09:02

本文关键词： 热轧无缝钢管 QB 静力试验 GTN模型损伤参数　出处：《建筑结构学报》2014年04期 　论文类型：期刊论文

【摘要】：对Q345B热轧无缝钢管加工的光滑和缺口圆棒试件进行单调加载试验,获取其应力-应变关系、载荷-位移曲线及基本材料参数,研究GTN损伤模型参数取值范围,采用逆推法识别GTN参数,在ABAQUS中利用自编GTN损伤模型UMAT用户子程序实现圆棒试件试验过程的数值模拟,依据数值分析结果比较孔洞的初始体积分数f0、形核孔洞体积分数fn和表征材料失效时的孔洞破坏体积分数fF三个损伤参数对断裂预测结果的影响。结果表明:试件失效点位置随着f0和fn的增大提前出现,而fF越大,试件断裂后下降段斜率则越小,并据此确定Q345B热轧无缝钢管材GTN损伤模型参数,所识别参数可以较准确预测钢试件的断裂点。
[Abstract]:A monotone loading test was carried out on the smooth and notched round bar specimens of Q345B hot rolled seamless steel tube. The stress-strain relationship, load-displacement curve and basic material parameters were obtained, and the range of GTN damage model parameters was studied. The inverse method is used to identify the GTN parameters, and the self-made GTN damage model UMAT user subroutine is used to realize the numerical simulation of the test process of the round rod in ABAQUS. According to the results of numerical analysis, the effects of initial volume fraction f _ 0, nucleation volume fraction f _ n and void failure volume fraction f _ (F) on fracture prediction results were compared. With the increase of f0 and fn, the position of failure point appears ahead of time. The larger the F F is, the smaller the slope of the falling section is after fracture, and the GTN damage model parameters of Q345B hot rolled seamless steel tube can be determined accordingly. The identified parameters can accurately predict the fracture point of the steel specimen.
【作者单位】：北京交通大学土木建筑工程学院;中国建筑股份有限公司技术中心;
【基金】：国家自然科学基金面上项目(51278036) 中国铁路总公司科技研发计划项目(2013T002-A-2) 教育部高等学校学科创新引智计划项目(B13002) 中央高校基本科研业务费专项基金项目(2012JBM007)
【分类号】：TU511.3

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