Alumina strength degradation in the elastic regime

Journal Article · Fri Jul 10 04:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.55697· OSTI ID:21185655

Furnish, Michael D; Chhabildas, Lalit C ^[1]

---

1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Measurements of Kanel et al. [1991] have suggested that deviatoric stresses in glasses shocked to nearly the Hugoniot Elastic Limit (HEL) relax over a time span of microseconds after initial loading. 'Failure' (damage) waves have been inferred on the basis of these measurements using time-resolved manganin normal and transverse stress gauges. Additional experiments on glass by other researchers, using time-resolved gauges, high-speed photography and spall strength determinations have also lead to the same conclusions. In the present study we have conducted transmitted-wave experiments on high-quality Coors AD995 alumina shocked to roughly 5 and 7 GPa (just below or at the HEL). The material is subsequently reshocked to just above its elastic limit. Results of these experiments do show some evidence of strength degradation in the elastic regime.

• OSTI ID: 21185655
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 429; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
DEFORMATION
FRACTURES
GLASS
IMPACT TESTS
LOADING
MANGANIN
PHOTOGRAPHY
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SHEAR
SHOCK WAVES
STRESSES
TIME RESOLUTION
VELOCITY