Analysis of the thermomechanical shear behaviour of woven-reinforced thermoplastic-matrix composites during forming
Analysis of the thermomechanical shear behaviour of woven-reinforced thermoplastic-matrix composites during forming
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DOI：
10.1016/j.compositesa.2016.03.032
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发表时间：
2016-07-01
影响因子：
8.7
通讯作者：
Major, Zoltan
中科院分区：
文献类型：
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作者：
Machado, Martin;Murenu, Luca;Major, Zoltan
玻璃纤维/聚丙烯复合材料的剪切性能在很大的应变速率和成型温度范围内进行了表征。这里引入了一个温度和速率相关的材料模型来描述所观察到的行为。该模型基于连续方法，并考虑了基于经纬纱旋转的应力目标导数。通过偏置拉伸试验模拟，分析了温度和应变速率对剪切性能的影响。测量了成形过程中板料的温度变化。该数据用于模拟成形过程中的冷却。为了验证温度和成形速度对剪切角分布的影响，进行了等温和瞬态成形模拟。研究发现，在低成形速度下，等温成形的假设不再成立，因为板材的冷却会影响剪切行为。(C) 2016 Elsevier Ltd.版权所有。
Shear behaviour of a glass fibre/polypropylene composite is characterized over a wide range of strain rates and forming temperatures using the bias extension test. A temperature- and rate-dependent material model is here introduced to describe the observed behaviour. The model is based on a continuous approach and formulated considering a stress objective derivative based on the warp and weft yarns rotation. The effects of temperature and strain rate on the shear behaviour are analysed via bias extension test simulations. Temperature change in the sheet during forming was measured. This data is used to model cooling during forming. Isothermal and transient forming simulations were performed in order to show the effects of temperature and forming speed on the obtained shear angle distribution. It was found that at low forming speeds the assumption of isothermal forming is not valid anymore since the cooling of the sheet affects the shear behaviour. (C) 2016 Elsevier Ltd. All rights reserved.