WebAug 9, 2024 · Behavior 1: Yield Stress Dependence on Stress Triaxiality. Many thermoplastics, perhaps even most, exhibit a yield stress that is different between tension and compression. The reason for this is that when the macromolecules are squeezed together by a hydrostatic pressure the shear stress required to cause viscoplastic flow … History In 1959 Davies and Connelly introduced so called triaxiality factor, defined as the ratio of Cauchy stress first principal invariant divided by effective stress $${\displaystyle {{\eta }_{DC}}\equiv 3\,{{\sigma }_{m}}/{{\sigma }_{ef}}={{I}_{1}}/{\sqrt {3{{J}_{2}}}}}$$, cf. formula (35) in Davies and … See more The triaxiality factor $${\displaystyle \eta }$$ gained considerable attention and popularity when Wierzbicki and his collaborators pointed out that not only pressure ($${\displaystyle -{{\sigma }_{m}}}$$) … See more Relations $${\displaystyle \eta \,({{\theta }_{sk}})}$$ valid for biaxial (plane) stress states show that in such a case, the values of the … See more Stress triaxiality has important applications in fracture mechanics and can often be used to predict the type of fracture (i.e. ductile or brittle) … See more
Sensitivity Analysis on Triaxiality Factor and Lode Angle in Ductile ...
WebTable 8.6 displays appreciable decrease of stress triaxiality from 1.134 for CF specimen to 0.853 induced by notch blunting in specimens with P 0 /P GY up to 1.5. The reduction of stress triaxiality compensates for the effect of the drop of residual compressive stress (shown in Table 8.5) and keeps the normal tensile stress increasing at a lower rate … WebThe stress triaxiality values at center and middle points are relatively stable with loading, and followed by a sharp increase before fracture, as shown in Figure 6b,c. It is worth … boxshape.circle flutter
Effects of steel liner corrosion on the leak-tightness
WebJan 1, 1993 · The von Mises yield criterion was modified by using the Davis and Connelly triaxiality factor (TF) to account for the effects of the stress state and strain rate on … WebMar 6, 2009 · Theoretical and experimental studies have shown that stress triaxiality is the key parameter controlling the magnitude of the fracture strain. Smooth and notched round bar specimens are mostly often used to quantify the effect of stress triaxiality on ductile fracture strain. There is a mounting evidence (Bai and Wierzbicki, 2008, “A New Model of … WebMar 2, 2012 · Stress Triaxiality is the ratio of Hydrostatic stress and the von-Mises stress and is known to have a great influence on the plastic deformation. You can view this … box-shaped