An Analysis of Cracks Emanating From a Circular Hole in Unidirectional Fiber Reinforced Composites. Part 2.
Abstract
An analytical method is developed for cracks emanating from a circular hole in an off-axis unidirectional fiber-reinforced composite. The method is formulated by using conservation laws of elasticity and fundamental relationships in anisotropic fracture mechanics. The method provides a very convenient and accurate means to examine the complicated crack behavior, when used in conjunction with a suitable numerical scheme such as the finite element method. The formulation is eventually reduced to a system of linear algebraic equations of mixed-mode stress intensity factors. Fracture parameters, describing crack-tip of deformation and fracture in the composite, are obtained explicitly. Effects of material anisotropy and crack/hole geometry are examined also. Of particular interest are the energy release rates associated with crack extension; their values are evaluated for various cases. Results show that mixed-mode stress intensity factors and energy release rates associated with the cracks emanating from a hole change very appreciably with fiber orientation in the composite. K sub I and G increase monotonically with increasing e; but K11 reaches its maximum at theta = 45 deg, and then decreases gradually as theta increases further. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1981
- Accession Number
- ADA302677
Entities
People
- J. F. Yau
- S. S. Wang
Organizations
- University of Illinois Urbana–Champaign