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Boundary layer thermal stresses in angle-ply composite laminates, part 1. [graphite-epoxy composites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Choi, I. Wang, S. S. |
| Copyright Year | 1981 |
| Description | Thermal boundary-layer stresses (near free edges) and displacements were determined by a an eigenfunction expansion technique and the establishment of an appropriate particular solution. Current solutions in the region away from the singular domain (free edge) are found to be excellent agreement with existing approximate numerical results. As the edge is approached, the singular term controls the near field behavior of the boundary layer. Results are presented for cases of various angle-ply graphite/epoxy laminates with (theta/-theta/theta/theta) configurations. These results show high interlaminar (through-the-thickness) stresses. Thermal boundary-layer thicknesses of different composite systems are determined by examining the strain energy density distribution in composites. It is shown that the boundary-layer thickness depends on the degree of anisotropy of each individual lamina, thermomechanical properties of each ply, and the relative thickness of adjacent layers. The interlaminar thermal stresses are compressive with increasing temperature. The corresponding residual stresses are tensile and may enhance interply delaminations. |
| File Size | 1369935 |
| Page Count | 67 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820018837 |
| Archival Resource Key | ark:/13960/t0ns5kb6x |
| Language | English |
| Publisher Date | 1981-02-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Interlayers Stress Analysis Fiber Composites Edges Thickness Tensile Stress Anisotropy Strain Energy Methods Delaminating Graphite-epoxy Composites Eigenvectors Ply Orientation Boundary Layers Thermal Stresses Residual Stress Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
