Portal de Periódicos da CAPES

Creep rupture under tri-axial tension

1986; Elsevier BV; Volume: 25; Issue: 5-6 Linguagem: Inglês

10.1016/0013-7944(86)90030-5

1873-7315

D.R. Hayhurst, I.D. Felce,

Aluminum Alloys Composites Properties

The design of a three-axis specimen is described which can be used to subject moderately large volumes of material to relatively homogeneous tri-axial tension stresses. Constitutive equations developed for uni- and bi-axial stress states to describe high-temperature creep deformation and rupture are used to predict lifetimes and the deformation of copper and of aluminium alloy specimens. The theoretical predictions are shown to compare favourably with experimental results, so vindicating the use of bi-axial constitutive equations for more complex tri-axial stress states. Metallographic studies show that grain boundary cavitation occurred, without preferred orientation, in the centre of the test cubes in both materials.