纤维分布与界面强度对复合材料横向压缩性能影响分析
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摘要
建立了纤维随机分布代表性体积单元微观力学模型,采用随机扩张算法生成纤维随机分布模型,微观有限元模型中采用内聚力单元和Drucker-Prager弹塑性准则分别对界面和基体的力学行为进行描述,分析研究了纤维分布形式与界面强度对复合材料横向压缩性能的影响。结果表明纤维随机分布是引起复合材料横向压缩强度不稳定的一个因素;基体剪切塑性损伤而不是界面损伤在复合材料横向压缩破坏过程中起主导作用,因而采用无界面单元模型可以简化建模、不需要考虑界面强度取值,并能很好地预测复合材料横向压缩强度与压缩损伤破坏形貌。
The representative volume element(RVE) of the computational micromechanics is established with random fiber distribution being generated by random sequential expansion algorithm. The plasticity of matrix and interfacial decohesion are simulated by using Drucker-Prager model and cohesive zone model respectively. The effects of the random fiber distribution and interfacial strength on the transverse compressive strength of unidirectional composites are analyzed. The results show that the random fiber distribution is a factor to cause the instability of the transverse compressive strength. Meanwhile, the matrix plastic shear damage and non interfacial damage is dominated in compression failure. Therefore, the RVE model without interface element adopted can clearly predict the compressive strength and the damage process of unidirectional composites, which contributes to simplify the modeling without considering the value of interfacial parameters.
The representative volume element(RVE) of the computational micromechanics is established with random fiber distribution being generated by random sequential expansion algorithm. The plasticity of matrix and interfacial decohesion are simulated by using Drucker-Prager model and cohesive zone model respectively. The effects of the random fiber distribution and interfacial strength on the transverse compressive strength of unidirectional composites are analyzed. The results show that the random fiber distribution is a factor to cause the instability of the transverse compressive strength. Meanwhile, the matrix plastic shear damage and non interfacial damage is dominated in compression failure. Therefore, the RVE model without interface element adopted can clearly predict the compressive strength and the damage process of unidirectional composites, which contributes to simplify the modeling without considering the value of interfacial parameters.
引文
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[3] VAJARI D A,GONZáLEZ C,LLORCA J,et al.A Numerical Study of the Influence of Microvoids in the Transverse Mechanical Response of Unidirectional Composites[J].Composites Science & Technology,2014,97(16):46-54
[4] NAYA F,GONZáLEZ C,LOPES C S,et al.Computational Micromechanics of the Transverse and Shear Behavior of Unidirectional Fiber Polymers Including Environmental Effects[J].Composites:Part A,2017,92:146-157
[5] 澎湃,赵美英,王文智.细观力学模型预测复合材料横向强度性能研究[J].机械科学与技术,2017,36(10):1611-1618PENG Pai,ZHAO Meiying,WANG Wenzhi.Transverse Strength Prediction of Composite Materials via Micromechanics Model[J].Mechanical Science and Technology for Aerospace Engineering,2017,36(10):1611-1618 (in Chinese)
[6] GONZáLEZ C,LLORCA J.Mechanical Behavior of Unidirectional Fiber-reinforced Polymers under Transverse Compression:Microscopic Mechanisms and Modeling[J].Composites Science & Technology,2007,67(13):2795-2806
[7] TOTRY E,GONZáLEZ C,LLORCA J.Failure Locus of Fiber-Reinforced Composites under Transverse Compression and Out-of-Plane Shear[J].Composites Science & Technology,2008,68(3):829-839
[8] TOTRY E,GONZáLEZ C,LLORCA J.Prediction of the Failure Locus of C/Peek Composites under Transverse Compression and Longitudinal Shear through Computational Micromechanics[J].Composites Science & Technology,2008,68(15):3128-3136
[9] CANAL L P,GONZáLEZ C,SEGURADO J,et al.Intraply Fracture of Fiber-reinforced Composites:Microscopic Mechanisms and Modeling[J].Composites Science & Technology,2012,72(11):1223-1232
[10] YANG L,YAN Y,LIU Y,et al.Microscopic Failure Mechanisms of Fiber-Reinforced Polymer Composites under Transverse Tension and Compression[J].Composites Science & Technology,2012,72(15):1818-1825
[11] O′DWYER D J,O′DOWD N P,MCCARTHY C T,Numerical Micromechanical Investigation of Interfacial Strength Parameters in a Carbon Fibre Composite Material[J].Journal of Composite Materials,2014,48(6):749-760
[12] PARAMBIL N K,GURURAJA S.Micro-Scale Progressive Damage Development in Polymer Composites under Longitudinal Loading[J].Mechanics of Materials,2017,111:21-34
[13] MAREK R.A Study of Deformation and Failure of Unidirectional Fiber-Reinforced Polymers under Transverse Loading by Means of Computational Micromechanics[M].Switzerland,Springer International Publishing,2016
[14] LUBLINER J,OLIVER J,OLLER S,et al.A Plastic-Damage Model for Concrete[J].International Journal of Solids & Structures,1989,25(3):299-326
[15] YANG L,YAN Y,RAN Z,et al.A New Method for Generating Random Fibre Distributions for Fibre Reinforced Composites[J].Composites Science & Technology,2013,76(76):14-20
[16] SODEN P D,HINTON M J,KADDOUR A S.Lamina Properties,Lay-up Configurations and Loading Conditions for a Range of Fibre-Reinforced Composite Laminates[J].Composites Science & Technology,1998,58(7):1011-1022