Accession Number:

ADA542013

Title:

A High Strain-Rate Investigation of a Zr-Based Bulk Metallic Glass and an HTPB Polymer Composite

Descriptive Note:

Final rept. Mar 2009-Jan 2011

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

2011-03-01

Pagination or Media Count:

308.0

Abstract:

High strain-rate tests are performed on LM-1 using a Split-Hopkinson Pressure Bar SHPB to investigate effects of LD ratio and annealing. An ultra high-speed camera was also employed to record the deformation and failure processes of LM-1. The amorphous specimens exhibit a reduction in peak stress with reduced LD ratio and failure at the specimen-insert interface, indicative of stress concentrations due to the difference in the specimen and insert diameters, while the annealed specimens exhibited extensive fragmentation. High strain-rate compression experiments are conducted on a hydroxy-terminated polybutadiene HTPB polymer and its composite using another modified SHPB for testing of soft materials. Results from the experiments on HTPB polymer indicate a transition in the polymer between low and high strain-rate sensitivity at 2100s, along with axial splitting at strain-rates above 3000s. On the other hand, reduced rate-sensitivity is observed in the HTPB composite, most likely due to the presence of numerous interfaces between the glass beads and the polymer binder.

Subject Categories:

  • Polymer Chemistry
  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE