Micro-mechanical damage model accounting for composite material nonlinearity due to matrix-cracking of unidirectional composite laminates
| Autor: | Ghazi Abu-Farsakh, Haitham M. Al-Jarrah |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Composite number General Engineering chemistry.chemical_element 02 engineering and technology Epoxy Composite laminates 021001 nanoscience & nanotechnology Nonlinear system Matrix (mathematics) 020303 mechanical engineering & transports 0203 mechanical engineering chemistry visual_art Ceramics and Composites visual_art.visual_art_medium Fiber Graphite Composite material 0210 nano-technology Boron |
| Zdroj: | Composites Science and Technology. 167:268-276 |
| ISSN: | 0266-3538 |
| DOI: | 10.1016/j.compscitech.2018.08.012 |
| Popis: | A new micromechanical damage model for predicting the effect of matrix-cracking on the mechanical behavior of the composite material is proposed. The model is based on the volumetric change that occurred due to the presence of cracks in a composite lamina due to uniaxial off-axis loading. It determines the volumetric crack-density (VCD) by combining the macro-mechanical and micro-mechanical principles. A representative volume-element is proposed that determines the material mechanical properties (E1, E2, G12 and ν 12 ) in terms of crack-density, fiber and matrix properties and initial volume-fraction of fibers. The rule-of-mixture in combination with Halpin-Tsai model is used to determine the mechanical properties of a cracked composite lamina. It has been shown that, matrix-cracking is the main cause for composite-material nonlinearity. Moreover, the model has been shown to give a reliable and reasonable predictions of the VCD and the tangential damage-factor (TDF) for various fiber/matrix systems using the corresponding available data from literature. An alternative secant damage-factor is being proposed, which has a linear relationship with the VCD. In order to validate the model, two composite materials; Boron/Epoxy (Narmco-5505) and Graphite/Epoxy (4617/Modmor-II), have been considered using laminates at different fiber-orientation angles. The maximum volume-crack-density (MVCD) and maximum secant damage-factor (MSDF) are obtained using equations that depend on the fiber-orientation angle and the initial material mechanical properties. |
| Databáze: | OpenAIRE |
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