Bonded repair of a plate with inclined central crack under biaxial loading
- National Cheng-Kung Univ., Tainan (Taiwan, Province of China). Dept. of Mechanical Engineering
This paper is to discuss the performance of bonded repair technology on a plate with inclined central through crack under biaxial loading. The concept is to change the load path and by-pass the defect or crack in structure. Consequently, the stress intensity factors or the energy level near the crack tip can be reduced. Most efforts have been made on the study of how to optimize the patch fiber orientation at different biaxial loading ratios when single or double side reinforcement method is approached. In practical application and for convenience, a general design guideline about ply orientation has been proposed by A. A. Baker and R. Jones. It is suggested that the orientation should be selected to have the maximum practical number of 0{degree} plies in the direction perpendicular to the crack. A small number of plies could also, if desired, be oriented at 90{degree} and {+-}45{degree} to 0{degree} plies to prevent cracking under structure biaxial and shear loads. In this paper, the interaction between biaxial loading and ply orientation on an inclined crack is studied numerically. The results show that if the ply orientation slightly coincides with the maximum principal tensile stress, the stress intensity factors and thus the minimum strain energy density factor can be reduced to the minimum. For those cases of structures under constant loading conditions, it seems to be necessary to modify the design guideline.
- OSTI ID:
- 143615
- Report Number(s):
- CONF-930246--; ISBN 0-87339-251-5
- Country of Publication:
- United States
- Language:
- English
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