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首页> 外文期刊>Latin American Journal of Solids and Structures >Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.
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Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.

机译：基于纤维断裂的临界数和纤维-基质界面强度的修正，用于单向复合材料拉伸响应的破碎模型。

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Abstract A fragmentation model based on global load sharing (GLS) theory is developed to obtain stress-strain curves that describe the mechanical behavior of unidirectional composites. The model is named C N B + τ * because it is based on the Critical Number of Breaks model (CNB) and on the correction of the fiber matrix interfacial strength, τ *. Model allows both obtaining the ultimate tensile strength of CFRP and GFRP composites, and correcting the σ vs ε curve to match its peak point with the predicted strength, which is more accurate than the one obtained by previous GLS-based models. Our model is used to classify the mechanical response of the material according to the energetic contributions of two phenomena up to the failure: intact fibers (IF) and fragmentation (FM). Additionally, the influence of fiber content, V f, on the tensile strength, σ U, failure strain, ε U, and total strain energy, U T, is analyzed by means of novel mechanical-performance maps obtained by the model. The maps show a dissimilar behavior of σ U, ε U and U T with V f between GFRP and CFRP composites. The low influence of V f on the percent energetic contributions of IF and FM zones, as well as the larger energetic contribution of the FM zone, are common conclusions that can be addressed for both kinds of composites.
机译：摘要建立了基于全局载荷分担（GLS）理论的破碎模型，以获取描述单向复合材料力学行为的应力-应变曲线。该模型被命名为C N B +τ*，因为它基于临界断裂数模型（CNB）和纤维基质界面强度τ*的校正。该模型既可以获取CFRP和GFRP复合材料的极限拉伸强度，又可以校正σvsε曲线以使其峰值与预测强度相匹配，这比以前的基于GLS的模型所获得的精确度更高。我们的模型用于根据直到故障的两种现象的能量贡献对材料的机械响应进行分类：完整纤维（IF）和碎裂（FM）。此外，通过该模型获得的新型机械性能图，分析了纤维含量V f对拉伸强度σU，破坏应变εU和总应变能U T的影响。这些图显示了GFRP和CFRP复合材料之间的σU，εU和U T与V f的不同行为。 V f对IF和FM带的百分比能量贡献的影响较小，而FM带的较大能量贡献是可以针对两种复合材料解决的常见结论。

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