Time to Failure Size Effect for Tensile Creep Specimens

E-ISSN： 1662-9795|2014|627|185-188

ISSN： 1013-9826

Source： Key Engineering Materials, Vol.2014, Iss.627, 2015-01, pp. : 185-188

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Size effect for tension specimen in creep condition is not very well recognised phenomenon. The Weibull’s works on influence of nonhomogeneity of material properties on its strength suggest that such effect should take place also for creep. The most of authors regard that the stress redistribution occurring during creep considerably reduces size effect. To examine it the author performed a series of experiments for thin tin alloy wires creeping in room temperature as well as some numerical simulations. The results confirmed the existence of size effect for time to failure. The numerical analysis was made for time of first macroscopic damage occurrence t₁ and for time of cross-section failure t₂. Both these parameters show the influence of specimen size according to size effect law, but the dependence of parameter t₁ was more pronounced.