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The characteristics of selected triaxiality measures of the stresses for a C(T) specimen dominated by the plane strain state

Graba M.

International Journal of Applied Mechanics and Engineering

2020

Vol. 25, no. 1

52--74

The paper presents a comprehensive analysis of the stress field and selected triaxiality parameters near the crack tip for C(T) specimen dominated by the plane strain state using the finite element method. It includes some theoretical information about elastic-plastic fracture mechanics, the basics of the FEM modeling and presentation of the numerical results. The FEM analysis includes calculations with large strain assumptions. The influence of the external load and crack length is discussed. Additional elements of the paper are a qualitative assessment of the size of plastic zones and the crack tip opening displacement.

Influence of Failure Strain of Different Aluminium Alloys on Dynamic Problems

Rodriguez-Millan M., Vaz-Romero A., Rodriguez-Martinez J. A., Rusinek A., Arias A.

Engineering Transactions

2012

Vol. 60, iss. 4

345-353

In this work an experimental-numerical methodology is devised for analyzing ductile frac- ture of two aluminum alloys under different values of stress triaxiality (0:2 1:2) and Lode parameter ( 1 0). The experiments developed include combined loading (tension- torsion) tests on same NT specimen geometry for A 5754-H111 and AA 6082-T6. Numerical analysis shows that this type of specimen exhibits uniformity stable values of stress triaxiality and Lode parameter as plastic strain develops. Experimental results can be used to compare failure strain corresponding to different stress states. Moreover, to consider the influence of stress state in failure mechanics under impact loads, perforation tests of aluminum alloys have been developed in a range of impact velocity between 120 v 500 m/s. The tests were carried out with three di?erent shape projectiles: conical (m = 29:4 g) and two blunt ones (m = 29:4 g and m = 1:1 g). Results show the dependence on energy absorption with stress state and failure strain.