Effect of size on necking of dynamically loaded notched bars

Abstract

The influence of material inertia on neck development in a notched round bar is analyzed numerically. Dynamic axisymmetric calculations are carried out for isotropically hardening elastic-viscoplastic solids so that both material strain rate sensitivity and material inertia are accounted for. The focus is on the effect of bar size on whether the notch triggers necking or necking initiates away from the notch. The governing equations are presented in non-dimensional form and two key non-dimensional groups that involve both material and loading parameters are identified. For both non-dimensional groups, with all parameters fixed except for bar size, it is found that for sufficiently small bars, the notch triggers necking, whereas for sufficiently large bars necking ultimately occurs away from the notch. With material properties fixed, for one non-dimensional group the transition to necking away from the notch corresponds to increasing imposed velocity whereas for the other nondimensional group this transition takes place for decreasing imposed strain rate. Both these transitions correspond to increasing bar size. The results indicate that this transition is governed by material inertia but the bar size at which it occurs depends on the material properties, particularly strain hardening and strain rate hardening.

Fracture mechanism and toughness of a rolled magnesium alloy under dynamic loading

“…wherein one of the important parameters is the ratio of imposed velocity to elastic wave speed [53].…”

The combined effect of plastic orthotropy and tension-compression asymmetry on the development of necking instabilities in flat tensile specimens subjected to dynamic loading

“…Thus, in the following, the loading time for which the equivalent plastic strain reaches 1.2 is referred to as the (full) localization time. A similar criterion was used, for example, by Needleman (2018) to determine when a neck is fully developed in numerical simulations of metallic bars subjected to dynamic tension. This is a local criterion that we assume suitable for dynamic problems in which the specimen is not equilibrated during loading.…”

Necking of thin-walled cylinders via bifurcation of incompressible nonlinear elastic solids

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