Post-Crazing Stress Analysis of Glass-Epoxy Laminates.
Abstract
A glass-epoxy material known as Scotchply XP-250 was characterized. The material's various strengths and stiffnesses were determined in tension, compression, and shear. The three-rail fixture was used for the shear tests. A modified IITRI fixture was used for compression. Glass-epoxy laminates having the following layups were tested in tension: plus or minus 30 s, plus or minus 45 s, plus or minus 60 s, and 0/ plus or minus 45/90 s. The stress-strain behavior in the pre- and post-crazing regions was predicted wth a lamination program which employed the nonlinear ply shear curve. These predicted and test results were compared. A finite element program was written for obtaining stress analysis of laminated structures with stress concentrations. The program used a doubly-curved, isoparametric, thick-plate or thick-shell element. A number of example problems were solved. The finite element results were compared to test results for a 0/plus or minus 45/90 s tension coupon containing a hole. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1979
- Accession Number
- ADA122744
Entities
People
- Dallas G. Smith
- Ju-chin Huang
Organizations
- Tennessee Technological University