Al&r&-Fibrous composite shells containing through-wall-thickness cracks and subjected to bending loads have crack closure at the crack faces under compression. A study was undertaken to determine the effect of crack closure on the displacement and stress fields of a composite shell using the finite
Analysis of effects of crack closure in shells
โ Scribed by Y.W. Kwon
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 591 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0013-7944
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โฆ Synopsis
me effect of crack closure in a shell was studied using the finite element method. Elastic open cylindrical she& containing dour-wall-t~ckness stationary cracks under bending loads, were considered. Crack closure was modeled using the line closure model. Effects of crack closure were compared among shallow, moderately deep and very deep shells. Two bending moments, a positive moment and a negative moment, were also considered to find out the difference on the effect of crack closure for a very deep shell.
๐ SIMILAR VOLUMES
NOMENCLATURE Young's modulus shear modulus elastic constant : 3 -4y plane strain ; 3 -r/l + y plane stress force per unit thickness of plate open end mode I stress intensity factor open end mode II stress intensity factor Poisson's ratio applied uniform tension, 2p/k + 1 distance of concentrated for
Ah&act-It has been suggested that the crack closure concept can account for the retardation in crack growth rate following removal of tensile overloads. To test this possibility measurements of effective stress were made on center notched cracked specimens during tests in which tensile overloads wer