Consolidation-Driven Defect Generation in Thick Composite Parts 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of manufacturing science and engineering: Transactions of the ASME
年/卷/期
2018 / 140 / 7
ISSN号
1087-1357
作者单位
Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England;Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England;Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England;Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England;Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England;Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England;
作者
Thompson, A. J.;Ivanov, D. S.;Potter, K. D.;Hallett, S. R.;Nixon-Pearson, O. J.;Belnoue, J. P. -H.;
摘要
Fiber waviness is one of the most significant defects that occurs in composites due to the severe knockdown in mechanical properties that it causes. This paper investigates the mechanisms for the generation of fiber path defects during processing of composites prepreg materials and proposes new predictive numerical models. A key focus of the work was on thick sections, where consolidation of the ply stack leads to out of plane ply movement. This deformation can either directly lead to fiber waviness or can cause excess fiber length in a ply that in turn leads to the formation of wrinkles. The novel predictive model, built on extensive characterization of prepregs in small-scale compaction tests, was implemented in the finite element software ABAQUS as a bespoke user-defined material. A number of industrially relevant case studies were investigated to demonstrate the formation of defects in typical component features. The validated numerical model was used to extend the understanding gained from manufacturing trials to isolate the influence of various material, geometric, and process parameters on defect formation.
机翻摘要
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关键词/主题词
composite manufacturing simulation;wrinkles;excess length;toughened prepreg;variable thickness;
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