Accession Number : AD0486443

Title :   CREEP BEHAVIOR OF AN ALUMINUM ALLOY UNDER TRANSIENT TEMPERATURES.

Descriptive Note : Technical rept.,

Corporate Author : COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY

Personal Author(s) : Murro, R. P.

Report Date : JUN 1966

Pagination or Media Count : 76

Abstract : Creep of 2024-0 aluminum alloy was investigated under isothermal conditions and for several positive and negative inear rates of temperature change for the same temperature range and sigma = 10,000 P.S.I. The creep rates of the transient temperature tests were described using a time dependent viscosity coefficient. The temperature dependence of the elastic modulus was determined by resonant vibration tests. Using a time dependent viscosity coefficient having a nonlinear stress dependence for a Maxwell material possessing linearly elastic compressibility, explicit solutions for the stresses in a hollow sphere resulting from a step of internal pressure and steps of temperature at its boundaries (at t = 0) are presented. Numerically computed values are compared with values obtained for the same sphere in which, however, the viscosity coefficient is expressed by conventional activation energy theory.

Descriptors :   *ALUMINUM ALLOYS), (*CREEP, TEMPERATURE, VISCOSITY, ELASTIC PROPERTIES, STRAIN(MECHANICS), MODULUS OF ELASTICITY.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE