Accession Number : ADA319317

Title :   Experimental Results of Cruciform Specimens Under Biaxial Elastic-Plastic Loading.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Wang, C. H. ; Heller, M.

PDF Url : ADA319317

Report Date : AUG 1996

Pagination or Media Count : 55

Abstract : Biaxial experiments have been conducted using cruciform specimens to generate elastic-plastic material deformation data. Such data is required to validate a multiaxial constitutive model which has been implemented in finite element analysis codes at AMRL. The elastic-plastic data have been obtained for two aircraft metallic materials namely: 7050 aluminium alloy and D6AC high strength steel. In this work some of the deficiencies in the existing biaxial test system at AMRL have been rectified, including the provision for strain control testing. It has been shown that for this type of work, a new specimen design is needed to allow a wider range of biaxial stress conditions to be investigated, and a suitable design is given herein. Furthermore, as an alternative to incremental plasticity models, a simple closed-form, integral solution has been developed and is presented for proportional, cyclic loading. Using this integral solution, good agreement between experimental results and the theoretical predictions has been obtained.

Descriptors :   *ELASTIC PROPERTIES, *PLASTIC PROPERTIES, *BIAXIAL STRESSES, *CRUCIFORM CONFIGURATIONS, TEST AND EVALUATION, METALS, AIRCRAFT, ALUMINUM ALLOYS, PREDICTIONS, MODELS, MATERIALS, FINITE ELEMENT ANALYSIS, LOADS(FORCES), DEFORMATION, STEEL, CYCLES, CODING, SOLUTIONS(GENERAL), HIGH STRENGTH, AUSTRALIA.

Subject Categories : Mechanics
      Aircraft
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE