Micromechanical damage behavior of fiber-reinforced composites under transverse loading including fiber-matrix debonding
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ORIGINAL PAPER
Micromechanical damage behavior of fiber-reinforced composites under transverse loading including fiber-matrix debonding and matrix cracks Mohammad Palizvan · Mohammad Tahaye Abadi · Mohammad Homayoune Sadr
Received: 23 July 2019 / Accepted: 18 September 2020 © Springer Nature B.V. 2020
Abstract This paper examines the micromechanical damage behavior of carbon-epoxy composite using representative volume elements (RVEs). An algorithm is developed to generate random distributions of fibers in the RVE, and it is possible to create a fiber distribution with high fiber volume fractions. Fiber-matrix debonding and matrix crack are considered as the dominant damage modes. The fiber material is considered linear elastic and Drucker–Prager’s plastic criterion coupled with progressive damage behavior is assumed for matrix material. Moreover, cohesive elements are considered to model fiber-matrix debonding. The effects of different parameters such as fiber volume fraction, random fiber distribution, normal radii distribution, various cohesive parameters, and minimum fiber neighboring spacing on the overall damage behavior of the RVE, mostly the regime beyond the peak stress, are described in detail. It is concluded that due to the high-stress concentration regions, smaller elements are needed to analyze the high fiber volume fractions RVEs accurately. The peak stress and the corresponding strain are insensitive to microstructural randomness. Furthermore, the RVEs’ final failure strain is highly dependent on different fiber arrangeM. Palizvan · M. H. Sadr (B) Aerospace Engineering Department, Amirkabir University of Technology, Tehran, Iran e-mail: [email protected] M. Tahaye Abadi Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran
ments layouts. Since the RVEs are under transverse strain, normal cohesive strength is the dominant cohesive zone parameter that has a significant role in the damage behavior of RVEs. It is shown that minimum fiber neighboring spacing affects the strain in which matrix crack initiates. Keywords RVE · Fiber-matrix debonding · Matrix crack · Damage mechanics · Composite material
1 Introduction Fiber reinforced composite materials have been applied in a wide range of structural applications (Hollaway 2010), especially in the aerospace industry (Soutis 2005), as they have strong mechanical performance. The mechanical response of composite materials may be affected by several damage mechanisms in which the fibermatrix debonding and matrix cracks are of primary damage modes. Although the initiation and propagation of these damage modes will not directly cause the collapse of the structure, they will instantly decrease the strength of the damaged layer to a specific limit. Experimental researches have confirmed that the primary damage mechanism associated with transverse fiber direction is debonding occurring at the fiber-matrix interface (Gamstedt and Sjögren 1999; Thomas 2006). Due to the damage behavior complexity, many micromechanical investigation
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