Crack face sliding displacement (CSD) as an input in exact GLOB-LOC expressions for in-plane elastic constants of symmetric damaged laminates
| Autor: | Mohamed Sahbi Loukil, Janis Varna |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Computational Mechanics 02 engineering and technology Composite laminates 021001 nanoscience & nanotechnology Displacement (vector) Finite element method In plane 020303 mechanical engineering & transports Stiffness degradation 0203 mechanical engineering Mechanics of Materials Transverse cracking Face (geometry) General Materials Science Composite material 0210 nano-technology Glob (visual system) |
| Zdroj: | International Journal of Damage Mechanics. 29:547-569 |
| ISSN: | 1530-7921 1056-7895 |
| DOI: | 10.1177/1056789519866000 |
| Popis: | The crack opening and crack sliding displacements of both faces of an intralaminar crack are the main parameters defining the significance of each crack in laminate stiffness degradation, according to the previously published GLOB-LOC approach for symmetric laminates with an arbitrary number of cracks in all plies. In the exact stiffness expressions of this approach, the crack density is always multiplied by crack opening displacement and crack sliding displacement. The dependence of crack opening displacement on geometrical and elastic parameters of adjacent plies was studied previously and described by simple fitting functions. The crack sliding displacement has been analyzed for low-crack densities only and the proposed finite element method-based fitting expressions are oversimplified not including the out-of-plane ply stiffness effects. Based on finite element method analysis, more accurate expressions for so-called non-interactive cracks are suggested in the presented article. For the first time the shear stress perturbations are analyzed and interaction functions are presented with the feature that they always lead to slightly conservative predictions. The presented simple fitting functions, when used in the GLOB-LOC model, give predictions that are in a good agreement with finite element method results and with experimental data for laminates with damaged off-axis plies in cases when crack face sliding is of importance. The significance of including crack sliding displacement in stiffness predictions is demonstrated. |
| Databáze: | OpenAIRE |
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