Call number:
ZSP-201-93/11
In:
CRREL Report, 93-11
Description / Table of Contents:
A laboratory study of the behavior of snow under shock wave loading and unloading conditions was conducted using a 200-mm-diameter gas gun to generate loading waves in snow samples with initial densities of 100 to 520 kg m-3 at temperatures of -2 to -23 deg C. Stress levels were 2 to 40 MPa. The response of snow to shock wave loading was measured as a function of distance from the impact plane using embedded stress gauges. Large impedance differences between snow and the stress gauges produced complex stress histories. A finite element model, along with a simple analytical model of the experiment, was used to interpret the stress histories. Snow deformation was not affected by initial temperature, but was found to be rate dependent. The initial density of the snow determined its pressure-deformation path. The pressure needed to compact snow to a specific final density increases with decreasing initial density. The release moduli increased nonlinearly from 50 MPa at a snow pressure of about 15 MPa to 2700 MPa at a snow pressure of about 40 MPa.
Type of Medium:
Series available for loan
Pages:
iii, 150 Seiten
,
Illustrationen
Series Statement:
CRREL Report 93-11
URL:
https://apps.dtic.mil/dtic/tr/fulltext/u2/a270467.pdf
URL:
https://hdl.handle.net/11681/9163
Language:
English
Note:
CONTENTS
Preface
Introduction
Experimental equipment and methods
Gas gun
Snow target assembly
Data acquisition
Experimental procedure
Measured data
Stress histories
Snow characterization
Data analysis
Recommendations
Experimental methods
Experimental needs
Summary
Literature cited
Appendix A : Stress-time data plots
Appendix B: Tabulated stress-time data
Abstract
Location:
AWI Archive
Branch Library:
AWI Library
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