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Stress coupling effect of ideal shear strength: a case study of tungsten

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Document pages: 5 pages

Abstract: Based on the first principle, the mechanical response of ideal body centered cubic tungsten crystal to multiaxial load is studied. Multiaxial stress states include shear stress, superimposed triaxial compressive stress and different degrees of differential stress. The shear system studied is analyzed. The results obtained in a relatively wide range of compressive stresses show that increasing hydrostatic triaxial stress (zero difference stress) almost linearly increases the shear strength. On the other hand, the triaxial stress with large proportional differential component has no such simple effect on the shear strength: we find that an optimal value of superimposed triaxial stress can produce the maximum shear strength. Any change (increase and decrease) I the triaxial stress then reduced the ideal shear strength value.

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