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首页> 外文期刊>Plastics, Rubber and Composites >Finite element model of thermla strees effects on stress distributions in rubber modified glassy polymers Part 1 - Single particle model
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Finite element model of thermla strees effects on stress distributions in rubber modified glassy polymers Part 1 - Single particle model

机译：热应力对橡胶改性玻璃态聚合物中应力分布的影响的有限元模型第1部分-单颗粒模型

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A single particle finite element model has been used to analyse the effects of thermal stresses on the stress distributions near the interface between the rubber particle and the matrix in rubber modified polymers. The thermal stresses are due to the mismatch of thermal contraction between the rubber particle and the matrix during cooling. The study is to determine whether the thermal stresses are significant enough to affect the distribution of normal stress and von Mises stress at the particle/matrix interface. Results from the single particle model show that a temperature decrease of 60 K, i.e. from 100 to 40°C, can generate a circumferential compressive stress at the particle/ matrix interface, which is of the same magnitude as the tensile stress required to cause failure in most of the glassy polymers. Although the effect on the circumferential normal stress is significant, its effect on the von Mises stress is very small. The results also show that when the cavitation occurs in the rubber particle, the thermal stress effect is drastically reduced. This study provides encouraging evidence for the importance of thermal stresses in determining the stress distributions in rubber modified polymers and suggests that thermal stresses should be considered in the deformation analysis of these materials.
机译：使用单粒子有限元模型来分析热应力对橡胶改性聚合物中橡胶粒子与基体之间界面附近应力分布的影响。热应力归因于冷却期间橡胶颗粒与基体之间的热收缩失配。该研究旨在确定热应力是否足以影响粒子/基体界面处的正应力和冯·米塞斯应力的分布。单颗粒模型的结果表明，温度降低60 K，即从100降低到40°C，可在颗粒/基体界面产生周向压应力，其强度与引起破坏所需的拉应力相同在大多数玻璃状聚合物中。尽管对圆周法向应力的影响很大，但对冯·米塞斯应力的影响却很小。结果还表明，当在橡胶颗粒中发生气穴现象时，热应力效应大大降低。这项研究提供了令人鼓舞的证据，说明热应力对确定橡胶改性聚合物中应力分布的重要性，并建议在这些材料的变形分析中应考虑热应力。

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