当前位置: X-MOL 学术Int. J. Solids Struct. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Modelling of nonlocal damage and failure in ductile steel sheets under multiaxial loading
International Journal of Solids and Structures ( IF 3.6 ) Pub Date : 2021-07-17 , DOI: 10.1016/j.ijsolstr.2021.111166
Marvin Nahrmann 1 , Anton Matzenmiller 1
Affiliation  

A continuum damage model is proposed capturing the influence of damage on the stress tensor for ductile steel sheets under multiaxial loading conditions. The model consists of a critical strain, representing damage initiation, as well as a failure strain. Both are Hosford-Coulomb type functions of the triaxiality and the Lode parameter. In order to prevent the pathological mesh-sensitivity for continuum damage models, the approach is extended towards nonlocal damage evolution. Thereby, two different established methods are compared: the integral based nonlocal formulation and the gradient enhanced damage method. A critical assessment of both methodologies is carried out by comparing the simulation results with test data of various tensile, shear and biaxial specimens, made of the microalloyed steel HX340LAD. The outcome demonstrate the superiority of the gradient enhanced approach for industrial applications, since nearly the same prediction accuracy is obtained as with the integral nonlocal approach, but the simulation time is significantly shorter.



中文翻译:

多轴载荷作用下延性钢板非局部损伤和失效的建模

提出了一种连续损伤模型,用于捕捉多轴载荷条件下损伤对韧性钢板应力张量的影响。该模型由一个临界应变(代表损伤开始)和一个失效应变组成。两者都是三轴度和矿脉的Hosford-Coulomb型函数范围。为了防止连续损伤模型的病理网格敏感性,该方法扩展到非局部损伤演化。因此,比较了两种不同的既定方法:基于积分的非局部公式和梯度增强损伤方法。通过将模拟结果与由微合金钢 HX340LAD 制成的各种拉伸、剪切和双轴试样的测试数据进行比较,对这两种方法进行了严格的评估。结果证明了梯度增强方法在工业应用中的优越性,因为获得了与积分非局部方法几乎相同的预测精度,但模拟时间明显更短。

更新日期:2021-08-13
down
wechat
bug