Effect of viscoelasticity on interfacial stress transfer mechanism in the biocomposites: A theoretical study of viscoelastic shear lag model
Effect of viscoelasticity on interfacial stress transfer mechanism in the biocomposites: A theoretical study of viscoelastic shear lag model
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DOI：
10.1016/j.compositesb.2018.11.086
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
Jiayu Wu;Jiayu Wu;Hong Yuan;Long-yuan Li
中科院分区：
文献类型：
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作者：
Jiayu Wu;Jiayu Wu;Hong Yuan;Long-yuan Li
具有规则交错排列微结构的生物复合材料在天然生物组织中经常被观察到，并且表现出优越的上级力学性能。由于其粘弹性性质，生物复合材料表现出应力率依赖的刚度函数和力学行为。本文提出了一个线性粘弹性剪切滞后模型（SLM）来描述三角形加载脉冲下生物复合材料的细观力学行为。理论和数值结果推导出预测纤维和纤维间基质的变形和应力传递，而生物复合材料是短暂的拉伸。解析解和数值解的结果表明，纤维搭接长度和加载速率如何影响生物复合材料的应力传递和力学性能。阐述了粘弹性生物材料在瞬态载荷作用下的结构-性能相关性，指出具有粘弹性的软物质特征长度的存在参与了瞬态载荷作用下相邻增强体之间的载荷传递机制，优化了相邻增强体之间的载荷传递机制.研究发现，不连续原纤模型可以保证较大的相对滑动变形，有利于能量耗散，保护原纤不受整体损伤，实现高韧性和高韧性，为工程纤维增强复合材料提供有益的设计策略。
Biocomposite with regularly staggered alignment microstructure is frequently observed in natural biological tissues, and exhibits superior mechanical behavior. Owing to their viscoelastic nature, biocomposites exhibit stress rate-dependent stiffness function and mechanical behavior. In this paper, a linear viscoelastic shear lag model (SLM) is proposed to illustrate the micromechanical behavior of biocomposites under triangular loading pulse. Theoretical and numerical results are derived to predict the deformation and stress transfer between fibers and interfibrous matrix while the biocomposite is transiently stretched. The results from the analytical and numerical solutions demonstrate that how the fiber overlap length and loading rate affect the stress transfer and mechanical properties of biocomposites. The structure-property correlation is illustrated for viscoelastic biomaterials under transient loading, and existence of characteristic length of soft matter with viscoelastic property is involved in load transfer mechanism between the adjacent reinforcements in transient regime, which optimizes the load transfer mechanism between the adjacent reinforcements. Furthermore, we found that discontinuous fibril model could ensure large relative sliding deformation, helping dissipate energy, protecting fibril from overall damage, and achieving high ductility and high toughness, which can provide beneficial design strategies for engineering fiber reinforced composites.