Numerical simulation for the tensile failure of randomly oriented short fiber reinforced plastics based on a viscoelastic entropy damage criterion
Numerical simulation for the tensile failure of randomly oriented short fiber reinforced plastics based on a viscoelastic entropy damage criterion
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DOI：
10.1016/j.jcomc.2022.100342
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发表时间：
2022-12-16
期刊：
影响因子：
--
通讯作者：
Koyanagi, Jun
中科院分区：
文献类型：
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作者：
Kagawa, Hikaru;Umezu, Yuta;Koyanagi, Jun
在这项研究中，我们进行了随机取向的短纤维增强塑料（SFRP）的拉伸破坏的数值模拟集成熵损伤准则。使用Mori-Tanaka理论作为复合材料的模型。树脂的本构方程是由一个传统的粘弹性模型与幂律考虑熵损伤。利用本构方程和应力-应变历史计算耗散能。将耗散的能量除以绝对温度得到熵值，该熵值与导致弹性模量降低的材料损伤有关。树脂的这种劣化行为被整合到Mori-Tanaka理论中。拉伸破坏模拟在范围从5度到85度的九个角度以10度增量实施，以确定拉伸强度和离轴角之间的关系。这些结果被引入到分层法（LWM）和叠加，以获得随机排列的短纤维增强塑料的拉伸强度。计算是通过改变应变速率来进行的。数值计算结果与实验结果吻合较好。因此，本研究的独创性是将粘弹性熵损伤准则引入传统的细观力学模型。
In this study, we conduct a numerical simulation of the tensile failure of randomly oriented short fiber reinforced plastics (SFRP) by integrating an entropy damage criterion. The Mori-Tanaka theory is used as the model for the composite. The constitutive equation of the resin is defined by a conventional viscoelastic model with a power law considering entropy damage. The dissipated energy is calculated using this constitutive equation and the stress-strain history. Dividing the dissipated energy by the absolute temperature yields an entropy value, which is related to material damage that results in a decrease in the elastic moduli. This deteriorating behavior of the resin is integrated into the Mori-Tanaka theory. The tensile failure simulation is implemented at nine angles ranging from 5 degrees to 85 degrees in 10 degrees increments to determine the relationship between the tensile strengths and off-axis angles. These results are introduced into the layer wise method (LWM) and superimposed to obtain the tensile strength of randomly arranged short fiber reinforced plastics. The calculations are performed by varying the strain rate. The numerical results are in good agreement with the experimental results. Thus, the originality of this study is the introduction of a viscoelastic entropy damage criterion into a conventional micromechanical model.