Surface Reactions and Fatigue Crack Growth
Abstract
Recent fracture mechanics and surface chemistry studies of environment assisted crack growth in gaseous environments have shown that crack growth may be controlled in some systems by the rate of surface reactions and in others by the rate of transport of the aggressive environment to the crack tip. Based on considerations of surface reactions and gas transport, a model for surface reaction and transport controlled fatigue crack growth in single component gaseous environments was proposed and experimentally verified. In practice, however, there is usually more than one gas in a given environment. The various component gases can compete for surface reaction sites and therefore alter the fatigue crack growth response. In this paper, the development of the model for surface reaction and transport controlled fatigue crack growth in single component gaseous environments is briefly reviewed. Modeling of fatigue crack growth in a binary gas mixture, in which one of the components acts as an inhibitor, is described, and the model is applied to the consideration of the influence of oxygen on fatigue crack growth in humid air. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1981
- Accession Number
- ADA109296
Entities
People
- G. W. Simmons
- Robert P. Wei
Organizations
- Lehigh University