Accession Number:

ADA614093

Title:

Annular Pulse Shaping Technique for Large-Diameter Kolsky Bar Experiments on Concrete

Descriptive Note:

Interim rept. Oct 2012-Feb 2014

Corporate Author:

AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIR/ORDNANCE DIVISION

Report Date:

2014-10-01

Pagination or Media Count:

16.0

Abstract:

The goal of this study is to design a novel annular pulse shaping technique for large-diameter Kolsky bars for investigating the dynamic compressive response of concretes. The purpose of implementing an annular pulse shaper design is to alleviate inertia-induced stresses in the pulse shaper material that would otherwise superpose unwanted oscillations on the incident wave. This newly developed pulse shaping technique led to well-controlled testing conditions enabling dynamic stress equilibrium, uniform deformation, and constant strain-rate in the testing of a chosen concrete material. The observed dynamic deformation rate of the concrete is highly consistent 8 variation with the stress in the specimen well equilibrated confirming the validity of this new technique. Experimental results at both quasi-static and dynamic 100s, 240s strain rates showed that the failure strength of this concrete is rate-sensitive. PA 96TW-2014-0048

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE