Nonlinear creep and ductile creep rupture of perfectly elastoplastic rods under tension

作者：Golub V P^*; Romanov A V; Romanova N V

来源：International Applied Mechanics, 2008, 44(4): 459-470.

DOI：10.1007/s10778-008-0058-6

• prismatic rod
• metallic perfectly elastoplastic material
• uniaxial tension
• nonlinear creep
• finite strains
• actual stress
• ductile rupture
• required plasticity
• initial (starting) plasticity

The paper is concerned with the problem of predicting nonlinear creep strains and time to ductile rupture of prismatic rods under constant tension. The material of the rod is assumed isotropic, homogeneous, and perfectly plastic. The problem is solved using models that take into account the change in the geometry of the rod during creep, the finiteness of the creep strains, and the effect of the initial and actual elastic strains. The conditions whereby the characteristic dimension of the rod tends to infinity and the accumulated and real strains in the viscous flow are limited are used as a failure criterion. The calculated results are compared with experimental data for a number of steels and alloys to formulate the conditions for the ductile rupture and embrittlement of metallic materials under uniaxial creep.

• 出版日期2008-4