Behavior of Porous Beryllium under Thermomechanical Loading. Part 4. Constitutive Model for Wave Propagation,
Abstract
A new constitutive model for wave propagation in porous materials is constructed here. Based on similar models proposed earlier by Herrmann and Holt, the new model features (1) inclusion of deviatoric stresses, (2) an option for porosity-dependent relaxation time for pore closure, (3) elastic reopening of the pores, and (4) an improved plastic compaction function. This model has been applied to plasma-sprayed porous beryllium in the as-sprayed condition (approx. 14% porosity) and after sintering (approx. 10% porosity). The techniques used to correlate data from the static and dynamic experiments which were conducted to provide the supporting inputs to the model are discussed. Wave profiles generated from plate impact experiments were used to test the model under different experimental conditions. The resulting good agreement between the model calculations and wave profile experiments suggests that the mechanical response of porous beryllium can be satisfactorily described within the necessary accuracy by this model. We also discuss two other relevant topics, namely, the effect of an in-material gage on observed wave profiles, and a transient phenomenon affecting the wave profile at the impact surface. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 05, 1974
- Accession Number
- ADA032757
Entities
People
- Francis H. Ree
- R. R. Horning
- W. M. Isbell
Organizations
- University of California