Finite element model for simulating entropy-based strength-degradation of carbon-fiber-reinforced plastics subjected to cyclic loadings
Finite element model for simulating entropy-based strength-degradation of carbon-fiber-reinforced plastics subjected to cyclic loadings
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DOI：
10.1016/j.ijfatigue.2022.107204
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发表时间：
2022-08-20
影响因子：
6
通讯作者：
Tay, T. E.
中科院分区：
文献类型：
--
作者：
Koyanagi, Jun;Mochizuki, Asa;Tay, T. E.
在这项研究中，基于碳纤维增强塑料(CFRP)铺层的应力和应变历史，建立了一种新的模拟强度和断裂能降低的模型，从而使我们能够全面地模拟CFRP铺层的包括疲劳破坏在内的各种失效。强度折减和断裂能折减被定义为熵产生的函数。由绝对温度和耗散的机械能(如非弹性磁滞回线的面积)得到了熵值。在传统的Hashin准则中引入了强度折减和断裂能折减。文中给出了该模型的算法，并进行了数值验证。通过一种简化的频变CFRP层合板模型，数值模拟了90度层在循环位移条件下的延迟破坏。
In this study, a novel model for simulating strength and fracture energy reductions based on the stress and strain histories of a carbon-fiber-reinforced plastic (CFRP) ply is developed, thus allowing us to comprehensively simulate the versatile failures including fatigue failure for CFRPs. The strength and fracture energy reductions are defined as functions of entropy generation. The entropy value is obtained from the absolute temperature and dissipated mechanical energy, such as the area of the inelastic hysteresis loop. Strength and fracture energy reductions are introduced into the conventional Hashin's criterion. An algorithm for this model and some numerical validations are presented herein. Through a simplified CFRP laminate model with frequency dependence, a delayed failure of 90 degrees layer under cyclic displacement conditions is numerically simulated.