# Effect of material strength on the relationship between the principal Hugoniot and quasi-isentrope of beryllium and 6061-T6 aluminum below 35 GPa

## Abstract

Quasi-isentropic (QI) compression can be achieved by loading a specimen with a low strain rate, long rise time uniaxial strain wave. Recent experimental data show that the quasi-isentrope of 6061-T6 aluminum lies a few percent above the principal Hugoniot, that is, at a given specific volume, the QI stress exceeds the principal Hugoniot stress. It has been suggested that this effect is due to material strength. Using Hugoniot data, shock-reshock, and shock-unload data for beryllium and 6061-T6 aluminum, we have constructed the quasi-isentropes as functions of specific volume. Our results show that the QI stress exceeds the principal Hugoniot stress above a Hugoniot stress of 8.4 GPa in beryllium, and between Hugoniot stresses of 3.8 and 21.4 GPa in aluminum. The effect is due to strength and implies that the QI yield strength can be large. Our calculations show that the QI yield strength is 0.9 GPa in aluminum at a QI stress of 9 GPa, and 5.2 GPa in beryllium at a QI stress of 35 GPa.

- Authors:

- Publication Date:

- Research Org.:
- University of California, Lawrence Livermore National Laboratory, Livermore, California 94550

- OSTI Identifier:
- 6069594

- DOE Contract Number:
- W-7405-ENG-48

- Resource Type:
- Journal Article

- Journal Name:
- J. Appl. Phys.; (United States)

- Additional Journal Information:
- Journal Volume: 57:5

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 36 MATERIALS SCIENCE; ALUMINIUM; EQUATIONS OF STATE; ISENTROPIC PROCESSES; STRESSES; YIELD STRENGTH; BERYLLIUM; COMPRESSION; PRESSURE EFFECTS; SHOCK WAVES; STRAINS; TENSILE PROPERTIES; ALKALINE EARTH METALS; ELEMENTS; EQUATIONS; MECHANICAL PROPERTIES; METALS; 360103* - Metals & Alloys- Mechanical Properties

### Citation Formats

```
Moss, W C.
```*Effect of material strength on the relationship between the principal Hugoniot and quasi-isentrope of beryllium and 6061-T6 aluminum below 35 GPa*. United States: N. p., 1985.
Web. doi:10.1063/1.334434.

```
Moss, W C.
```*Effect of material strength on the relationship between the principal Hugoniot and quasi-isentrope of beryllium and 6061-T6 aluminum below 35 GPa*. United States. doi:10.1063/1.334434.

```
Moss, W C. Fri .
"Effect of material strength on the relationship between the principal Hugoniot and quasi-isentrope of beryllium and 6061-T6 aluminum below 35 GPa". United States. doi:10.1063/1.334434.
```

```
@article{osti_6069594,
```

title = {Effect of material strength on the relationship between the principal Hugoniot and quasi-isentrope of beryllium and 6061-T6 aluminum below 35 GPa},

author = {Moss, W C},

abstractNote = {Quasi-isentropic (QI) compression can be achieved by loading a specimen with a low strain rate, long rise time uniaxial strain wave. Recent experimental data show that the quasi-isentrope of 6061-T6 aluminum lies a few percent above the principal Hugoniot, that is, at a given specific volume, the QI stress exceeds the principal Hugoniot stress. It has been suggested that this effect is due to material strength. Using Hugoniot data, shock-reshock, and shock-unload data for beryllium and 6061-T6 aluminum, we have constructed the quasi-isentropes as functions of specific volume. Our results show that the QI stress exceeds the principal Hugoniot stress above a Hugoniot stress of 8.4 GPa in beryllium, and between Hugoniot stresses of 3.8 and 21.4 GPa in aluminum. The effect is due to strength and implies that the QI yield strength can be large. Our calculations show that the QI yield strength is 0.9 GPa in aluminum at a QI stress of 9 GPa, and 5.2 GPa in beryllium at a QI stress of 35 GPa.},

doi = {10.1063/1.334434},

journal = {J. Appl. Phys.; (United States)},

number = ,

volume = 57:5,

place = {United States},

year = {1985},

month = {3}

}