Abstract The pultrusion of large-diameter glass fiber reinforced epoxy rods at high pulling speed is often accompanied by the formation of cracks at the surface of a profile, leading to product rejection. In this study, we investigate the causes of crack formation based on numerical simulations of manufacturing process mechanics, including the temperature distribution, degree of polymerization, and residual stresses. Based on the built model, we solve the problem of temperature condition optimization for maximizing pulling speed. The results show that up to 27% increases in pulling speed are possible provided that the following conditions are met: thermal destruction of the material is avoided; a profile is cooled sufficiently quickly before cut-off; a high degree of polymerization is achieved in a final product; and there are no cracks in a profile.

中文翻译：

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大尺寸型材拉挤开裂建模

摘要 大直径玻璃纤维增​​强环氧树脂棒材在高速拉挤过程中，常伴随型材表面出现裂纹，导致产品报废。在这项研究中，我们基于制造过程力学的数值模拟来研究裂纹形成的原因，包括温度分布、聚合度和残余应力。基于建立的模型，我们解决了温度条件优化问题，以最大限度地提高拉速。结果表明，如果满足以下条件，提拉速度最多可提高 27%：避免材料的热破坏；型材在切断前足够快地冷却；在最终产品中实现高聚合度；