1. Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy.
- Author
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Xu, Xiaodong, Wisnom, Michael R., Sun, Xiaoyang, Rev, Tamas, and Hallett, Stephen R.
- Subjects
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THICKNESS measurement , *PHYSICS experiments , *FRACTURE mechanics , *LAMINATED materials , *EPOXY resins , *MECHANICAL loads - Abstract
Mode II fracture energy, G IIC , is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has been studied using IM7/8552 carbon/epoxy laminates with cut central plies. External TTC loads were applied through bi-axial testing. Unidirectional (UD) cut-ply specimens were used to determine the TTC enhancement factor, η G , for G IIC . A similar enhancement effect was also found in Quasi-isotropic (QI) specimens with 2 extra cut central 0° plies inserted into the layup. The TTC enhancement factor was implemented in a Finite Element Analysis (FEA) framework using cohesive interface elements, showing that the determined η G can be successfully used to model the effect of TTC on delamination. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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