Stress Concentration Around a Small Circular Hole in the HiMAT Composite Plate.
Abstract
When an infinite isotropic plate containing a circular hole is subjected to remote uniaxial tension, the tangential stress along the boundary of the circular hole will reach a value three times the remote tensile stress at two boundary points lying on the hole diameter perpendicular to the loading axis. Namely, the maximum tangential stress concentration factor is 3, which is independent of the hole size. For anisotropic materials, such as fiber-reinforced composite materials, the picture is entirely different. The value of the maximum tangential stress concentration factor for a composite plate can be greater or less than 3, and the locations of the maximum stress points could shift depending on the loading direction and the fiber orientations. This report calculates the tangential stress distribution around a circular hole in a composite plate (single ply or laminated) and examines how the maximum stress points shift with the fiber orientations. In addtion, the dependency of the stress concentration factor on the hole size is examined. In the analysis, the composite system is treated as a continuous anisotropic plate having effective elastic properties. The calculated stress concentration factors are then compared with experimental data. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1985
- Accession Number
- ADA302100
Entities
People
- William L. Ko
Organizations
- National Aeronautics and Space Administration