Accession Number : AD0427919


Title :   CYCLIC STRAIN ACCUMULATION UNDER COMPLEX MULTIAXIAL LOADING


Descriptive Note : Technical documentary rept. Apr 1961-Jun 1963


Corporate Author : ILLINOIS UNIV AT URBANA FRACTURE RESEARCH LAB


Personal Author(s) : Moyar, G J ; Sinclair, G M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/427919.pdf


Report Date : Dec 1963


Pagination or Media Count : 48


Abstract : When a tubular specimen of copper is subjected to a small steady tension and alternating torsion at room temperature large axial strain increments accumulate on a cyclic basis. At relatively low values of axial stress a steady state cyclic strain accumulation is observed to develop. The strains and cyclic strain rates which are observed are many orders of magnitude greater than corresponding values obtained under conditions of standard static creep tests performed at the same peak effective stress. They are also many larger than those obtained due to simple repetition of the effective stress in more conventional dynamic creep tests. The experiments reported herein were designed to produce an extreme case of cyclic creep wherein time and temperature dependence are minimized. The analysis of results includes a comparison with plasticity theory predictions as well as a parameteric description of minimum cyclic creep rate.


Descriptors :   *PIPES , *SHEAR STRESSES , *AXIAL LOADS , DEFORMATION , THEORY , COPPER , MATHEMATICAL ANALYSIS , CREEP , PLASTIC PROPERTIES


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE