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) : Sunny, George P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a542013.pdf


Report Date : Mar 2011


Pagination or Media Count : 308


Abstract : High strain-rate tests are performed on LM-1 using a Split-Hopkinson Pressure Bar (SHPB) to investigate effects of L/D 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 L/D 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 2100/s, along with axial splitting at strain-rates above 3000/s. 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.


Descriptors :   *HYDROXY TERMINATED POLYBUTADIENE , *COMPOSITE MATERIALS , *ZIRCONIUM COMPOUNDS , *METALLIC GLASS , THESES , AMORPHOUS MATERIALS , STRAIN(MECHANICS) , BULK MATERIALS , BUTADIENES , POLYMERS , FRAGMENTATION , ANNEALING , STRESS STRAIN RELATIONS , DEFORMATION


Subject Categories : Polymer Chemistry
      Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Properties of Metals and Alloys
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE