Measures of Bulk and Grain Strain in Deformation Processes(PREPRINT)
Abstract
Many instances of severe plastic deformation produce a heterogeneous distribution of strain through a material. Common methods of describing the severity of deformation based on changes in the external dimensions of a specimen masks this heterogeneity, which is difficult to measure directly. This study describes a method of measuring internal strain based on the observation that networks of internal boundaries within a polycrystalline material deform locally in a manner congruent with the local metal flow. Appropriate measurements of the development of the spatial anisotropy of such networks with increasing deformation provide a basis for defining several measures of the local total strain. These quantities, called "grain strains" when the boundaries observed are grain boundaries, can serve as an experimental measure of the internal total strain in various locations in a specimen for comparison with computations based on finite element models using various constitutive relations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2007
- Accession Number
- ADA470126
Entities
People
- Craig S. Hartley
- Jonathan E. Spowart