Accession Number:

ADA413663

Title:

Analytical Modeling of ASTM Lap Shear Adhesive Specimens

Descriptive Note:

Final rept.

Corporate Author:

WICHITA STATE UNIV KS DEPT OF MECHANICAL ENGINEERING

Report Date:

2003-02-01

Pagination or Media Count:

78.0

Abstract:

Advanced composite materials have been widely used in the aviation industry due to their lightweight and high-corrosion resistance. While the aviation industry increasingly uses adhesive bond for airframe composite structures, two issues have become particularly important certification of adhesives used and certification of adhesive joints. A generally agreed-upon design methodology for adhesive-bonded composite joints, especially the failure criterion, is lacking. Typically, three failure modes of adhesive-bonded composite joints exist 1 adherend failure, 2 adhesive failure failure at the adhesiveadherend interface, and 3 cohesive failure failure within the adhesive layer. A previous report DOTFAAAR-0l57, 2001 included an analytical model development for adherend failure mode. This report describes the investigation of adhesive and cohesive failure modes. The first part presents the derivation of an analytical model for predicting adhesive stress distribution within the joint specimens of ASTM D 3165. Elastic orthotropic adherends and elastic-perfectly plastic adhesive were used in the model development. The developed stress model was verified with finite element models by comparing the adhesive stress distributions. Failure analysis was conducted based on three failure criteria. Predicted strengths were compared with test data. The second part of the report contains finite element approaches for analyzing adhesive and cohesive failure modes. The equivalent plastic strain and J-integral were used as the failure criteria for cohesive and adhesive failure modes, respectively. Experimental data were used to establish the values of the equivalent plastic strain and the critical value of J-integral. 12 tables, 62 figures, 27 refs.

Subject Categories:

  • Adhesives, Seals and Binders
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE