论文标题
在弹性塑料组成模型中的顶端控制
Apex control within an elasto-plastic constitutive model for confined concretes
论文作者
论文摘要
这项工作着重于限制非线性材料响应的多轴载荷时，限制了凝固的数值建模。特别是，这里提出了改进的返回映射程序，以应对屈服表面中的奇异性（角落）问题，能够在主动屈服表面上局部捕获最佳的返回点。该算法应用于脑膜和Willam的产量表面，其塑料电位如Grassl所建议，而Cervenka提出的软化法律适用于混凝土材料。这里讨论了重现混凝土限制行为及其后峰值行为并预测完美可塑性或软化的模型能力。所提出的方法可以应用于沿静水轴具有奇异屈服表面的任何弹性塑料材料。
This work focuses on the numerical modelling of confined concretes when subjected to multiaxial loading accounting for a nonlinear material response. Particularly, an improved return mapping procedure is here presented to cope with the issue of singularities (corners) in the yield surface, able to catch locally the optimal return point on the active yield surface. The algorithm is applied to the Menetry and Willam's yield surface, with a plastic potential as suggested by Grassl and the softening law proposed by Cervenka suitable for concrete materials. The model capabilities to reproduce the confined behaviour of concrete, as well as its post-peak behaviour, and to predict perfect plasticity or softening are here discussed. The proposed approach can be applied to any elastoplastic material with singular yield surface along the hydrostatic axis.
