Results 221 to 230 of about 22,115 (266)

Potentiometric nondestructive testing of surface-hardened materials

Review of Scientific Instruments, 1981
A new nondestructive method for the determination of the depth of surface-hardened layers in steels is presented. It is based on the measurement of the electric potential difference between points on the surface of the sample, as induced by a dc current flowing through the sample itself.
M. OMINI, IAZZI, Felice, A. RASTALDO, C. TURCO   +3 more
openaire   +2 more sources

Strain hardening rate in relation to microstructure in precipitation hardening materials

Le Journal de Physique IV, 2000
The influence of microstructure on strain hardening is studied through Kocks-Mecking plots in a number of systems showing precipitation hardening: Al-Zn-Mg, Al-Mg-Si-Cu, and Fe-Cu. The presence of a supersaturated solid solution is shown to result in an extremely high work hardening rate, due to dynamic precipitation during the straining.
A. Deschamps, S. Esmaeili, W. J. Poole, M. Militzer   +3 more
openaire   +1 more source

Laser Hardened Materials Evaluation Laboratory (LHMEL)

Journal of Laser Applications, 1996
Since 1976, the Laser Hardened Materials Evaluation Laboratory (LHMEL) has been characterizing material responses to laser energy in support of national defense programs and the aerospace industry. Now that capability is available to commercial industry as well.
R. J. Hull, M. L. Lander
openaire   +1 more source

Damage zones in strain-hardening materials

Mechanics of Materials, 1996
Abstract In this paper, damage distribution and damage zones of a strain hardening material with a crack are investigated. A continuum damage mechanics theory based formulation is developed via hypothesis of incremental complementary energy equivalence.
Yanghu Mou, Ray P.S. Han
openaire   +1 more source

Multiple Hardening Plasticity for Concrete Materials

Journal of Engineering Mechanics, 1988
A multiple hardening plasticity model for concrete materials under a general three-dimensional quasi-static loading condition is developed for the progressive failure analysis of concrete structures. The main features of the proposed short-term, time-independent constitutive model include (1) The use of the simple expressions of the Chen-Chen surfaces ...
Yasuhiro Ohtani, Wai‐Fah Chen
openaire   +1 more source

Redundant Trusses of Elastic-Strain-Hardening Material

Journal of Applied Mechanics, 1958
Abstract W. Prager has given a geometric method for the determination of the load-carrying capacity of a redundant truss consisting of elastic, perfectly plastic bars. In the present paper this method is generalized for trusses consisting of elastic-strain-hardening bars with given limit loads in tension and compression.
openaire   +2 more sources

Rate Type Plastic Material with General Work‐Hardening

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1978
AbstractA rate type plastic material is proposed. A scalar internal variable and a symmetric tensor internal variable are introduced. The constitutive and the evolutional equations are invariant for the change of time‐scale. Two sets of equations are assumed for the loading and the unloading state. Three material functions which define equations in the
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Shock Propagation in a Strain-Hardening Material

Journal of Applied Mechanics, 1969
Weak shock theory is used to analyze the propagation of the stress waves which are induced by nonuniform, instantaneous, internal heating of a nonlinearly elastic, semi-infinite solid. The material nonlinearity considered is caused by the increase in bulk modulus which occurs as the hydrodynamic stress component increases.
openaire   +1 more source

Plastic Bending of Work Hardening Materials

Journal of Engineering for Industry, 1982
The plane strain plastic bending of rigid-work hardening materials has been investigated and two models have been proposed. In Model I, a numerical solution based on a linear σ¯ – ε¯ approximation for fibers in reversed loading has been presented. Model II is an extension of Proksa's analysis to the case of materials described by Ludwik's equation.
S. A. Majlessi, P. Dadras
openaire   +1 more source

Fractals in elastic-hardening plastic materials

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2009
Plastic grains are found to form fractal patterns in elastic-hardening plastic materials in two dimensions, made of locally isotropic grains with random fluctuations in plastic limits or elastic/plastic moduli. The spatial assignment of randomness follows a strict-white-noise random field on a square lattice aggregate of square-shaped grains, whereby ...
Li, J., Ostoja-Starzewski, M.
openaire   +2 more sources