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首页> 外文期刊>Engineering Fracture Mechanics >A novel conjugated bond linear elastic model in bond-based peridynamics for fracture problems under dynamic loads
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A novel conjugated bond linear elastic model in bond-based peridynamics for fracture problems under dynamic loads

机译：一种新型共轭粘合线性弹性模型在动态负荷下骨折问题的基于临床性畸形

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摘要

A novel conjugated bond linear elastic model is proposed and implemented into the bond-based peridynamic (BB-PD) framework. In this model, micro-elastic PD bond energy is not only related to the normal stretch of bonds, but also related to the rotation bond angles of a pair of conjugated bonds. Therefore, micro bond energy mechanism in this study is different from that in the classical continuum mechanism or the standard BB-PD. Only one micro-elastic constant in the standard BB-PD results in the limitation of the effective Poisson's ratio for isotropic material. However, the novel conjugated bond linear elastic model incorporating two micro-elastic constants are proposed, which can overcome the limitation of Poisson's ratio in the standard BB-PD. By comparing the strain energy in the proposed model with that in the classical elastic model, the corresponding micro-macro parameter relationships can be established. In addition, energy-based bond rupture criteria are implemented in the proposed numerical model to simulate fracture problems under dynamic loads. In order to verify the ability and accuracy of the proposed numerical model to simulate fracture problems under dynamic loads, some numerical examples are investigated. The present numerical results are in good agreement with the previous experimental and numerical results. (C) 2017 Elsevier Ltd. All rights reserved.
机译：提出了一种新型共轭键线性弹性模型，并实施到基于粘合的白动力学（BB-PD）框架中。在该模型中，微弹性Pd粘合能量不仅与正常的键粘合有关，而且与一对共轭键的旋转结合角有关。因此，本研究中的微键能量机制与经典连续体机制或标准BB-PD中的微键能量机制不同。标准BB-PD中只有一种微弹常数导致有效泊松对各向同性材料的比率的限制。然而，提出了包含两个微弹性常数的新型共轭键线性弹性模型，这可以克服标准BB-PD中泊松比的限制。通过将所提出的模型中的应变能量与在经典弹性模型中的比较，可以建立相应的微宏参数关系。此外，基于能量的债券破裂标准在所提出的数值模型中实现，以模拟动态负荷下的断裂问题。为了验证所提出的数值模型的能力和准确性以在动态载荷下模拟断裂问题，研究了一些数值示例。目前的数值结果与先前的实验和数值结果吻合良好。 （c）2017 Elsevier Ltd.保留所有权利。

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