Petr Řehák, Miroslav Černý, Jaroslav Pokluda

Strength of cubic crystals under uniaxial compression and transverse biaxial stresses

Section A Mechanical Properties: Plastic Deformation, Fatigue, Fracture, Creep

Abstract	
Crystals and whiskers used in the industrial exploitation are usually
subjected to a multiaxial loading. Despite of this fact, just a few
attention has been paid to a coupling of various stress tensor
components. A typical example of simple multiaxial loading is a
stress induced by the matrix/reinforcement incompatibility strain on
the reinforcing single crystal fibre (or whisker) in a composite
material. The fibres are subjected to triaxial loading even in case
of purely uniaxial tension of the composite.
In this work, we study the dependence of the theoretical [100] uniaxial compressive strength of fcc metals
on the superimposed transverse biaxial stresses. 
A plane-wave pseudo-potential code abinit is employed
for calculation of stresses. The compressive biaxial stresses significantly increase the compressive strength whereas the opposite is true for tensile biaxial stresses.