Accession Number : ADA304019

Title :   Stress Concentrators and Rate Effects in Formation of Adiabatic Shear Bands.

Descriptive Note : Interim rept. no. 2, 1 Sep-30 Nov 95,

Corporate Author : METZ UNIV (FRANCE) LAB OF PHYSICS AND MECHANICS OF MATERIALS

Personal Author(s) : Klepaczko, J. R.

PDF Url : ADA304019

Report Date : NOV 1995

Pagination or Media Count : 2

Abstract : This Abstract covers the second period of the Contract on behavior of stress concentrators in an alloy steel at high loading rates. During this period two researchers have been working on numerical analyses of stress concentrators at high loading rates and on the Critical Impact Velocity in shear. Both numerical studies by the Finite Element method (Abacus) are performed for VAR 4340 steel of hardness 52HRC. Available literature data have been used to formulate a constutive model for VAR 4340 steel. A new series ot tests are in the final stage of preparation. The Modified Double Shear technique (MDS) test technique will be applied to specimens of four different stress concentrators. One part of specimens have been already machined (VAR 4340), but another plaque of this steel is needed to end machining. After machining and thermal treatment the specimens will be tested at different impact velocities. Experimental setup for MDS tests is under modification.

Descriptors :   *STEEL, *STRESS CONCENTRATION, MATHEMATICAL MODELS, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, IMPACT TESTS, FRACTURE(MECHANICS), HEAT TREATMENT, IMPACT STRENGTH, SHEAR STRESSES, GREAT BRITAIN.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE