arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.2662cond-mat.mtrl-sci
收藏

混凝土主方向塑性损伤模型

Plastic-damage model for concrete in principal directions

Sergey Ananiev, Josko Ozbolt

摘要:

本文讨论了混凝土的塑性损伤模型。基于各向同性材料的弹性试应力和投影塑性应力状态具有相同的特征向量,在主应力空间中建立加载面,而不用应力张量的不变量。该模型假设正交各向异性损伤方向与弹性预测应力状态的主方向一致(由同轴旋转裂纹模型激发)。由于这一假设,载荷表面和最近点投影算法仍然可以在主方向上形成。非弹性应变的演化是用极小化原理确定的。损伤和塑性部分的非弹性应变分离使用标量参数,这是假设为应力依赖。本文还讨论了一个有效的数值实现。一个说明性的例子证明了该模型的性能。

英文摘要:

In the present paper a plastic-damage model for concrete is discussed. Based on the fact that for isotropic materials the elastic trial stress and the projected plastic stress states have the same eigenvec-tors, the loading surface is formulated in the principal stress space rather than using the invariants of stress tensor. The model assumes that the directions of orthotropic damage coincide with principal directions of elastic predictor stress state (motivated by coaxial rotated crack model). Due to this assumption, the load-ing surface and the closest point projection algorithm can still be formulated in the principal directions. The evolution of the inelastic strain is determined using minimization principle. Damage and plastic parts of the inelastic strain are separated using a scalar parameter, which is assumed to be stress dependent. The paper also discusses an effective numerical implementation. The performance of the model is demonstrated on one illustrative example.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑