Modelling on stress redistribution around broken fibers for fiber reinforced plastic with poor fiber distribution uniformity

Zhu, Fulei; Yu, Dianlong; Jia, Tian; Cheng, Yuanqi; Zhang, Shufeng

doi:10.1002/pc.27020

Polymer Composites

2022

DOI: 10.1002/pc.27020

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Modelling on stress redistribution around broken fibers for fiber reinforced plastic with poor fiber distribution uniformity

Fulei Zhu

Dianlong Yu

Tian Jia

et al.

Abstract: In order to calculate stress redistribution after a fiber breaking for unidirectional fiber reinforced plastic (FRP) with practically poor fiber distribution uniformity, a new and efficient FE model is developed with high computation efficiency. Based on the proposed FE model, the stress concentration factor (SCF) of intact fibers around a broken fiber is investigated for unidirectional FRP. It is observed that the SCF depends heavily on the local fiber volume ratio (FVR), and a modified analytical SCF model i… Show more

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Cited by 3 publications

References 58 publications

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The strength prediction model of unidirectional fiber reinforced composites based on the renormalization group method

Qian,

Li,

Zhou

et al. 2024

Composites Science and Technology

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The strength prediction model of unidirectional fiber reinforced composites based on the renormalization group method

Qian,

Li,

Zhou

et al. 2024

Composites Science and Technology

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An accurate analytical model for stress overload around multiple fiber breakpoints in unidirectional fiber reinforced plastic

Yu,

Zhu,

Cheng

et al. 2023

Journal of Reinforced Plastics and Composites

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Efficient and accurate calculation of stress overload and stress redistribution near the fiber breakpoint is the basis for simulating the tensile damage evolution of unidirectional fiber reinforced plastic (FRP), and it is also the premise for predicting the tensile-tensile fatigue life. In this study, an efficient finite element (FE) model with a large number of fibers was developed based on the FE method to calculate stress concentration factor (SCF) near multiple breakpoints, and the calculation time only takes 3 min on average. The FE model is used to efficiently calculate multiple breakpoints and the stress distribution near the breakpoint considering the interface debonding. Based on the efficient FE model, an analytical model is developed to calculate the stress overload superposition around multiple breakpoints. In this analytical model, the shear stress distribution near the broken fiber elements is established based on the experiment, and the stress redistribution mechanism near the breakpoint in FRP with random distribution of fibers is established. Moreover, the calculation method of stress overload near multiple break points is established, and the FE method is verified.

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Computational Analysis of the Micromechanical Stress Field in Undamaged and Damaged Unidirectional Fiber-Reinforced Plastics Using a Modified Principal Component Analysis

Lopez,

Çelik,

Hopmann

2024

Polymers

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This study investigated the internal stress distribution of unidirectional fiber-reinforced plastics (UD-FRP) at the micro level using principal component analysis (PCA). The composite material was simulated using a representative volume element model together with the embedded cell approach. Two fundamental quasi-static load cases, transverse and longitudinal tensile deformation, were considered. The experimental results show that mechanical failure occurred at 2.15 ± 0.06% transverse tensile strain and at 1.52 ± 0.07% longitudinal tensile strain. Furthermore, the undamaged state and a combination of matrix and interface damage, as well as fiber breakage, were simulated. From the simulations, the octahedral shear stress and octahedral normal stress were computed at the integration points of the matrix elements, constituting what is known as the octahedral stress field. A modification on the PCA to obtain mesh-independent eigenvalues is presented and was used to investigate the effects of damage events on the octahedral stress field. The results indicate that each damage mechanism had a distinct signature in the redistribution of the stress field, characterized by specific changes in the eigenvalues and orientation of the principal component (θ1). Furthermore, the PCA suggests that the accumulation of matrix damage began to be relevant at the 1% strain, while fiber breakage began at an average longitudinal strain of 0.98 ± 0.12%. Additionally, it is shown that the first principal component served as an indicator of the predominant stress state of the stress field. This investigation suggests that the PCA can provide valuable insights regarding the complex damage mechanisms of UD-FRP that may not be captured by conventional mechanical analysis.

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Modelling on stress redistribution around broken fibers for fiber reinforced plastic with poor fiber distribution uniformity

Cited by 3 publications

References 58 publications

The strength prediction model of unidirectional fiber reinforced composites based on the renormalization group method

The strength prediction model of unidirectional fiber reinforced composites based on the renormalization group method

An accurate analytical model for stress overload around multiple fiber breakpoints in unidirectional fiber reinforced plastic

Computational Analysis of the Micromechanical Stress Field in Undamaged and Damaged Unidirectional Fiber-Reinforced Plastics Using a Modified Principal Component Analysis

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