An Analytical Study of the Split Hopkinson Bar Technique for Strain-Rate Dependent Material Behavior.
Abstract
The validity of the split Hopkinson bar technique for determining dynamic material behavior is examined for speciment materials which exhibit strain-rate dependent mechanical behavior. The torsional mode of deformation is chosen as more closely representing a one-dimensional state of stress. The details of the propagation and reflection of stress waves within the specimen are studied using a numerical procedure based on the method of characteristics. Reconsitituted stress- strain curves calculated from the conventional analysis of the split Hopkinson bar experiment are compared with actual material behavior for a number of simulated experiments involving variations in input stress, gage length, material behavior, and static stress-strain curves including statically prestressed materials. The validity of the experimental technique is discussed and limitations on its use are delinaeated. (Author-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1971
- Accession Number
- AD0732196
Entities
People
- Theodore Nicholas
Organizations
- Air Force Research Laboratory