Plastic deformation analysis of fracture in constrained interlayers subjected to shear loading
- National Institute of Standards and Technology, Gaithersburg, MD (United States). Polymers Division
- Tel Aviv Univ. (Israel). Dept. of Mechanics, Materials, and Structures
The distribution of elastoplastic stresses and strains in cracked adhesive bonds subjected to shear loading was determined from a large-strain, quasi-static finite element analysis. The adhesive post-yield behavior was modeled by the J{sub 2} criterion with associated flow rule, and isotropic strain hardening was considered. A narrow zone of intense plastic deformation dominated by shear was developed at the very edge of the crack tip. The shear strain within that zone was several times the average shear strain at the crack tip. Increasing adhesive strain hardening or decreasing bond thickness tended to reduce strain localization; for a 0.4 mm and an 18 {micro}m thick bonds, the interlayer shear strain became homogeneous starting from approximately 2.4 mm and 25 {micro}m ahead of the crack tip, respectively. The variations with load of the plastic zone length and of the average shear strain at the crack tip agreed well with experimental results. The mean-stress in the interlayer was found to increase with decreasing bond thickness. Its maximum, which always occurred at the very edge of the crack tip, did not exceed the uniaxial yield stress for all bond thicknesses attempted.
- OSTI ID:
- 89841
- Report Number(s):
- CONF-9409291--; ISBN 1-56676-220-0
- Country of Publication:
- United States
- Language:
- English
Similar Records
An experimentally verified finite element study of the stress-strain response of crack geometries experiencing large-scale yielding
Blunting of a plane strain crack tip into a shape with vertices