Calculation of thermal trapping in shock deformation of aluminum

Journal Article · Mon Nov 01 04:00:00 EST 1982 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.330101· OSTI ID:6740556

Grady, D E; Asay, J R

A precipitation hardened aluminum alloy (6061-T6) has been investigated extensively in terms of shock deformation properties during past years. Recently, advances in time-resolved measurements of stress waves in solids have assisted in revealing complicating features in the shock deformation process which are not easily incorporated into existing theories of plastic deformation. Specifically, significant changes in the dynamic hardness, post shock hardness, steady wave viscosity, and post shock microstructure have been observed over the shock pressure range of 5--20 GPa. Microscopic heterogeneity in the shock deformation process is one possible cause for the observed effects. Deformation heterogeneities can lead to transient temperature gradients. We have performed calculations which indicate that over the range of strain rates occurring in steady wave shocks in aluminum, a transition from thermal equilibrated to thermal trapping deformation can occur. The shock pressure at which the thermal transition is calculated to occur is consistent with onset of the observed anomalous shock effects.

• Research Organization: Sandia National Laboratories, Albuquerque, New Mexico 87185
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6740556
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 53:11; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL STRUCTURE
DEFORMATION
EQUILIBRIUM
HARDENING
IMPACT SHOCK
MATHEMATICAL MODELS
MICROSTRUCTURE
PRECIPITATION HARDENING
RESOLUTION
STRAINS
STRESSES
TEMPERATURE GRADIENTS
THERMAL EQUILIBRIUM
THERMAL STRESSES
TIME RESOLUTION
TIMING PROPERTIES
TRAPPING
VERY HIGH PRESSURE
VISCOSITY