Cyclic Crack Growth Emanating at a Round Notch Considering Viscoplasticity
Abstract
A finite element investigation was conducted to analyze a crack growing from a round (large radius) notch under cyclic conditions at 1200 deg F. The results of the finite element analysis were compared to previously published results obtained for a crack emanating from a blunt notch and a single-edge-cracked specimen. The finite element program used was a two-dimensional materially and geometrically nonlinear finite element code called SNAP. The program has the capability to release fixed nodes to allow crack growth and the ability to simulate crack closure under cyclic conditions. Constitutive equations set forth by Bodner and Partom were used to account for the nonlinear, viscoplastic material behavior exhibited by IN-718 at 1200 deg F. Finite element analysis of a crack growing from a round notch under cyclic loading provided crack opening profile information, opening and closing loads, stress and strain profiles and plastic zone estimations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1987
- Accession Number
- ADA189577
Entities
People
- Gary L. Chestnut
Organizations
- Air Force Institute of Technology