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Progressive failure analysis of unidirectional fiber-reinforced polymers with inhomogeneous interphase and randomly distributed fibers under transverse tensile loading |
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| Authors: | Marek Romanowicz |
| Affiliation: | 1. Texas A&M University, College Station, TX 77843, USA;2. Luleå University of Technology, SE 97187 Luleå, Sweden;3. Université de Lorraine, SI2M, FR-54000 Nancy, France;1. Department “Dynamics and Strength of Machines”, National Technical University, Kharkiv Polytechnic Institute, Ukraine;2. Institute of Materials and Structures, Riga Technical University, Latvia;1. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA;2. Department of Metallurgical and Materials Eng., Faculty of Petroleum and Mining Eng., Suez University, Suez, Egypt;3. Department of Aerospace Engineering, Texas A&M University, College Station, TX 77843, USA;4. Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE 971 87, Luleå, Sweden |
| Abstract: | The effect of damage due to interfacial debonding on the post initial failure behavior of unidirectional fiber-reinforced polymers subjected to transverse tension was investigated using numerical homogenization techniques based on the finite element method. Calculations were performed for unit cells containing fibers distributed at random over the transverse cross-section with inhomogeneous interphase layers. The mechanism of progressive failure was examined at both a global and a local level. A detailed analysis of the proposed micromechanics model revealed that it is able correctly to simulate the evolution of damage and to explain the softening mechanism. It was found that the post initial failure behavior of unidirectional lamina under transverse tension is mainly controlled by the interface strength and the interphase stiffness. The present study showed that local fiber array irregularities are a significant contributor to matrix cracking through local stress concentrations and the occurrence of localization. |
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