Nonlinear Fracture Mechanics Analysis with Boundary Integral Method.
Abstract
The first goal of the originally proposed program was to extend an existing planar elastic fracture mechanics analysis based on the BIE methodology to the analysis of plastic zones around cracks. The second proposed goal was to establish fundamental results for crack tip elastoplastic behavior, based on a numerical and analytical study of the elastoplastic BIE formulation. The third proposed goal was to establish the credibility of the elastoplastic BIE formulation relative to the finite element method for refined numerical analysis of the nonlinear fracture mechanics problem, and to apply the capability to important problems of fatigue crack growth modeling for advanced aerospace structures. The goal for the second year of the effort was to extend the research to the problem of modeling crack extension under elastoplastic conditions. This report summarizes key findings of the current research effort. The next section summarizes the basic two-dimensional elastoplastic formulation and applications. Included in this work are the preliminary applications of the new method to crack extension into prior plastic zones. The next section reports on the use of the new BIE formulation for elastic crack extension. This new result allows for the direct computation of crack weight functions. The last section reports on some recent work, for the 3D BIE fracture mechanics formulation. Some contrast with the 2D formulation is noted. Further work on the 3D problem is expected in the subsequent research program.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 30, 1986
- Accession Number
- ADA173216
Entities
People
- E. Z. Polch
- T. A. Cruse
Organizations
- Southwest Research Institute