Fracturing Characteristics of Adhesive Joints.
Abstract
Test methods were developed by MRL for evaluating the fracture mechanics parameters of adhesive joints. These tests, were designed for measuring crack resistance under Mode I, combined Mode I and II, and combined Mode I and and III loading. All of the tests can be applied to monotonically increasing loads, static loads in an environment, i.e., stress corrosion cracking, or to crack growth rate under fatigue loading. There does not appear to be a general 'law' for describing the effect of adding some shear (Mode II or III) onto opening mode loads; rather, the difference between pure and mixed mode loading depends on the load-time profile. Hence, mixed-mode loading must be treated differently for each type of loading. A section on bond manufacturing and testing details compares the phosphoric acid anodizing (PAA) aluminum adherend treatment to the chromic acid etch (FPL) on the basis of resistance to stress corrosion cracking in the wedge test. Application of linear elastic fracture mechanics to the prediction of structural life based on the use of finite element as well as an energy analysis are also discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1978
- Accession Number
- ADA075541
Entities
People
- E. J. Ripling
- Sheldon Mostovoy
Organizations
- Materials Research Laboratory