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首页> 外文期刊>Journal of Materials Science >Effect of fibre concentration, temperature and mould thickness on weldline integrity of short glass-fibre-reinforced polypropylene copolymer composites
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Effect of fibre concentration, temperature and mould thickness on weldline integrity of short glass-fibre-reinforced polypropylene copolymer composites

机译：纤维浓度，温度和模具厚度对短玻璃纤维增​​强聚丙烯共聚物复合材料熔合线完整性的影响

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摘要

The effect of fibre concentration, temperature and mould thickness on tensile strength of single- and double-gated injection-moulded polypropylene copolymer reinforced with 0, 10, 20, 30 and 40 wt% short glass fibre was studied at a fixed strain-rate of 7.58 × 10−3 s−1 between 23 and 100 °C. It was found that tensile strength of single-gated mouldings, σc, increased with increasing volume fraction of fibres, ϕf in a nonlinear manner and decreased with increasing temperature in a linear manner. However, for ϕf values in the range 0–10% a simple additive rule-of-mixtures adequately described the variation of σc with ϕf over the entire temperature range 23–100 °C studied here. Tensile strength of double-gated mouldings like their single-gated counterparts decreased linearly with increasing temperature. The presence of weldlines significantly reduced tensile strength of double-gated composite mouldings but had little effect on tensile strength of the matrix. Weldline integrity factor, F σ, defined as weldline strength divided by unweld strength, decreased with increasing ϕf but increased with increasing temperature. A linear dependence was found between F σ and temperature. Mould thickness had no significant effect upon weld and unweld tensile strengths and consequently had no significant effect upon weldline integrity factor.
机译：研究了纤维浓度，温度和模具厚度对以0、10、20、30和40 wt％的短玻璃纤维增​​强的单门和双门注塑聚丙烯共聚物的拉伸强度的影响。在23至100°C之间，为7.58×10 −3 s −1 。发现单浇口模制品的拉伸强度σ c 随纤维体积分数volume f 的增加呈非线性增加，而随温度的升高而减小。线性方式。但是，对于ϕ f 值在0–10％范围内，简单的加法混合法充分描述了σ c 与ϕ f σ定义为焊缝强度除以非焊接强度，随ϕ f 的增加而降低，但随温度的升高而增加。发现F σ与温度之间存在线性关系。模具厚度对焊接和未焊接拉伸强度没有显着影响，因此对焊接线完整性因子也没有显着影响。

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