Accession Number:

ADA411161

Title:

Low-Velocity Spall Testing of TI-6AL-4V Alloy and New Spall Criterion Based on Mesoscale

Descriptive Note:

Interim rept. 17 Jun-16 Sep 2002

Corporate Author:

METZ UNIV (FRANCE) LAB OF PHYSICS AND MECHANICS OF MATERIALS

Personal Author(s):

Report Date:

2002-09-16

Pagination or Media Count:

3.0

Abstract:

This Interim Report covers the contract period from June 172002 to Sept. 162002 the first period of three months.The research in this Project is directed toward better understanding of the development of the local plastic fields occurring in mesoscale during spalling of Ti-6A1-4V alloy. The specimens in the form of disks of different thickness and DIA 57.0 mm have been delivered by AMSRL-WM-TA, APG Aberdeen, MD. Later, all specimens have been polished and measured in our Laboratory LPMM. The plate-plate facility is in the stage of preparation. Since an observation on mesoscale is envisaged, more exactly, the surface topography after spall fracture will be analyzed, two new high resolution profilometers, one based on the light interferometry WYKO NTl000 by VEECO and the second MAHR profilometer, based on mechanical contact, have been put into operation. Both profilometers are equipped with a software which has been already tested . The software permits for a detailed analysis of 3D profiles. Preliminary analyses of the spall surfaces available after earlier experiments are in progress. The test results obtained for Ti-6Al-4V from experiments of shearing at high strain rates will be applied to identification of material constants in new temperature coupled constitutive relation.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE