An elastic-plastic interface constitutive model for combined normal and shear loading : application to adhesively bonded joints

The behavior of mechanical adhesive interfaces when subjected to a variety of separation and slide loading modes, strain rates, and thermal conditions are of interest in many technical areas. An elastic-plastic constitutive model for adhesive interfaces subjected to combined normal and shear loading has been developed and numerically implemented in a finite element software package. The traction-separation behavior is defined for the normal and shear mechanisms and a displacement jump angle is found to drive the behavior of the initial strength values, as well as the critical and failure displacement jumps of the separate mechanisms that are used to define the model. A set of calibration experiments are performed to fully define an aluminum/adhesive/aluminum system subjected to five different combined loading angles. Tension and shear tests on the aluminum/adhesive/aluminum system at three different rates are used to determine the sensitivity of the adhesive interface to strain rate. The capability of the constitutive model is then explored for the geometry of bonded curvilinear blocks at different loading angles and for a notched four point bend geometry. In addition, a rate dependent elastic-plastic interface constitutive model for combined normal and shear loading is presented, and an initial calibration of inelastic strain rate sensitivity parameters are found.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Cookson, Mary Catherine

Advisor dc:contributor.advisor

• Lallit Anand.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/62527

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/62527