Now showing items 1-9 of 9
Finite element models for predicting crack growth characteristics in composite materials
(Virginia Polytechnic Institute and State University, 1982)
Two dimensional and quasi-three dimensional, linear elastic finite element models for the prediction of crack growth characteristics, including crack growth direction, in laminated composite materials are presented. ...
Closure of fatigue cracks at high strains
(Virginia Polytechnic Institute and State University, 1985)
Experiments were conducted on smooth specimens to study the closure behavior of short cracks at high cyclic strains under completely reversed cycling. Testing procedures and methodology, and closure measurement techniques, ...
Experimental determination of the stress singularity exponent in cracked bodies using photoelasticity
(Virginia Polytechnic Institute and State University, 1986)
An experimental program is developed to investigate the three dimensional nature of the stress field surrounding the border of semi-elliptical surface flaws, particularly the singularity exponent. Stress freezing photoelasticity ...
Analysis of Composite Laminates with Matrix Cracks
(Virginia Tech, 1987)
Analysis of the effects of matrix cracking on composite laminates is a well-known problem which has attracted considerable attention for the past decade. An approximate analytical solution is introduced in this thesis to ...
Prediction of crack extension direction in unidirectional composites
(Virginia Polytechnic Institute and State University, 1984)
The purpose of this study was to gain a better understanding of the parameters affecting crack growth direction in unidirectional comµosite materials. To achieve this, the effect of anisotropy and biaxial loading on the ...
The constrained blister - a nearly constant strain energy release rate test for adhesives
(Virginia Tech, 1988-12-05)
<p>This study developed and analyzed a modification of the blister test permitting nearly constant strain energy release rate testing of adhesive bonds. The work consisted of three parts; (1) development of the testing ...
Preliminary investigation into the cracking of polyurethane
(Virginia Tech, 1987)
Elastic and time dependent matrix cracking in cross-ply composite laminates
(Virginia Polytechnic Institute and State University, 1988)
The effects of time and stress level were investigated in cross-ply laminates to gain more understanding on the damage events in composites. Analytical predictions of the effect of stress level were performed for the ...
An analytical and experimental study of crack extension in center- notched composites
(Virginia Polytechnic Institute and State University, 1987)
The normal stress ratio theory for crack extension in anisotropic materials is studied analytically and experimentally in order to evaluate its validity. The theory is applied within a macroscopic-level analysis of a single ...