The effect of imperfect bonding on stress distribution in fibrous composites

IF 2.3 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Journal of Composite Materials Pub Date : 2024-03-14 DOI:10.1177/00219983241241497
Parvaneh Kheirkhah Barzoki, Tianyi Hua, Ouli Fu, Yasser Gowayed
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Abstract

An attempt was made to map the distribution of stress in fibrous composites with imperfect bonding. Two analytical micro-mechanics models were developed. In the first model, the composite was subjected to axial tensile loading, parallel to the fiber direction, and the assumption of iso-strain was employed to derive the control equations. In the second model, the composite was loaded in the direction transverse to the fiber. An iso-stress condition was employed, and Airy stress function was utilized to articulate the stress and displacement equations. An assumption of how the stress is transferred between the matrix and the fiber was introduced in both models. To investigate and validate the models, specimens were fabricated using a carbon plain weave fabric and a geopolymer matrix. Single fiber pullout and three-point bending tests were carried out. The maximum average tensile stress obtained from the three-point bending tests, as well as the mechanical properties of the fiber and geopolymer, served as input for the models. Results indicate that the effect of the level of bonding is very high in the transverse direction while almost negligible in the axial direction. The difference in the maximum value of the axial tensile stress at the fiber-matrix interface was used to calculate the numerical value of the interfacial shear strength, and the numerical result matched the data obtained from the single fiber pullout test.
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不完全粘合对纤维复合材料应力分布的影响
尝试绘制不完全粘合的纤维复合材料的应力分布图。建立了两个微观力学分析模型。在第一个模型中,复合材料受到平行于纤维方向的轴向拉伸载荷,并采用等应变假设推导出控制方程。在第二个模型中,复合材料在纤维横向方向上受到加载。采用等应力条件,并利用艾里应力函数来阐明应力和位移方程。两种模型都引入了基体和纤维之间应力传递的假设。为了研究和验证模型,使用碳纤维平织布和土工聚合物基体制作了试样。进行了单纤维拉拔和三点弯曲试验。从三点弯曲试验中获得的最大平均拉伸应力以及纤维和土工聚合物的机械性能均可作为模型的输入。结果表明,粘合程度在横向上的影响非常大,而在轴向上几乎可以忽略不计。利用纤维-基质界面上轴向拉伸应力最大值的差值来计算界面剪切强度的数值,数值结果与单根纤维拉拔试验获得的数据相吻合。
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来源期刊
Journal of Composite Materials
Journal of Composite Materials 工程技术-材料科学:复合
CiteScore
5.40
自引率
6.90%
发文量
274
审稿时长
6.8 months
期刊介绍: Consistently ranked in the top 10 of the Thomson Scientific JCR, the Journal of Composite Materials publishes peer reviewed, original research papers from internationally renowned composite materials specialists from industry, universities and research organizations, featuring new advances in materials, processing, design, analysis, testing, performance and applications. This journal is a member of the Committee on Publication Ethics (COPE).
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