Accession Number : AD0488894

Title :   SHORT-TIME CREEP BEHAVIOR OF HEAT-TREATED 4340 STEEL UNDER UNIAXIAL TENSILE AND 1:2 TENSION-TENSION BIAXIAL LOADING,

Corporate Author : ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL AL PHY SICAL SCIENCES DIRECTORATE

Personal Author(s) : Austin, C. W., Jr

Report Date : 24 JUN 1966

Pagination or Media Count : 51

Abstract : This report presents the results of an experimental investigation to determine the short-time creep characteristics of heat-treated 4340 steel after rapid heating under load for uniaxial tensile loading and 1:2 tension-tension biaxial loading. Tests were conducted at three different stress levels at 700 and 1000 F. The test results and their analysis with regard to previously established creep analysis procedures and classical plasticity theory are presented. The results of this investigation substantiate the validity of classical plasticity theory assumptions of a constant-volume condition and the vonMises condition. The assumption of a generalized stress-strain function which describes the plasticity of a material at all temperatures appears to be invalid. At 1000 F, the effective-stress, effective-strain relation may be used to predict 1:2 tension-tension biaxial creep from uniaxial tensile creep data, while at 700 F, the more conservative maximum-shear-stress, maximum-shear-strain or maximum-principal-strain relation provides the most adequate description of the creep behavior. Apparent anisotropy of plastic flow observed in the test material precludes the prediction of the extent of plastic creep or rupture strain and time from uniaxial tensile creep data. (Author)

Descriptors :   *CREEP), (*STEEL, HEAT TREATMENT, TENSILE PROPERTIES, DEFORMATION, SHEAR STRESSES, STRAIN(MECHANICS), MODULUS OF ELASTICITY, MATHEMATICAL ANALYSIS.

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE