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Free edge strain concentrations in real composite laminates: experimental-theoretical correlation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Czarnek, R. Buczek, M. B. Post, D. Herakovich, C. T. |
| Copyright Year | 1984 |
| Description | The magnitude of the maximum shear strain at the free edge of axially loaded theta (2)/-theta(2)(s) and (+ or - theta(2) (s) composite laminates was investigated experimentally and numerically to ascertain the actual value of strain concentration in resin matrix laminates and to determine the accuracy of finite element results. Experimental results using moire interferometry show large, but finite, shear strain concentrations at the free edge of graphite-epoxy and graphite-polyimide laminates. Comparison of the experimental results with those obtained using several different finite element representations showed that a four node isoparametric finite element provided the best and most trouble free numerical results. The results indicate that the ratio of maxium shear strain at the free edge to applied axial strain varies with fiber orientation and does not exceed nine for the most critical angle which is 15 deg. |
| File Size | 946247 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840020850 |
| Archival Resource Key | ark:/13960/t6k11x971 |
| Language | English |
| Publisher Date | 1984-07-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Finite Element Method Stress Concentration Edge Loading Graphite-epoxy Composites Fiber Orientation Graphite-polyimide Composites Data Correlation Moire Interferometry Resin Matrix Composites Shear Strain Axial Strain 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 |
