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LAOS: The strain softening/strain hardening paradox
Journal of Rheology, 2014Numerous materials, from biopolymers to filled rubbers, exhibit strain softening at high strain amplitudes during a strain sweep in oscillatory rheology: The modulus decreases with increasing deformation. On the other hand, if the nonlinear elastic response is analyzed within a single oscillation cycle (described by a Lissajous curve), these systems ...
Mermet-Guyennet, M. +5 more
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Strain hardening of aluminium at high strains
Acta Metallurgica, 1983Abstract The paper brings a critical analysis of the shape of the strain hardening curve of aluminium within the range of high strains. Basing on a statistical analysis it has been shown that the hardening curve has a series of plateaus. The structural investigations indicate that the plateaus on the hardening curve correspond to heterogeneous ...
A. Korbel, F. Dobrzanski, M. Richert
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Hardening the surface of austenitic steels by strain hardening
Metal Science and Heat Treatment, 19711. The carrying capacity in terms of permissible stress (σ0, 2) of steels Kh18N10T and Kh21N5AG7 under conditions of uniaxial static tension increases 50% down to −253° as the result of surface hardening. 2. For hardened steels Kh18N10T and Kh21N5AG7 σ b n /σn > 1 and σ b n /σ0.2 > 1 with Kt=3.0 in the range of 20 to −253° C. 3.
D. V. Lebedev, B. M. Ovsyannikov
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Strain hardening of thermoplastics
Macromolecules, 1993Published stress-strain curves of different thermoplastics in tension are used to evaluate a theoretical equation derived from a model in which the strain hardening effect is related to the Gaussian network theory of rubber ...
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Strain hardening of steel �P836
Metal Science and Heat Treatment, 19851. The strength increase produced in steel EP836 as a result of deformation in the unaged state is low; subsequent aging of the deformed steel intensifies the hardening effect. A 72% deformation with subsequent aging ensures a 400-MPa strength increase. 2.
A. A. Lyadskaya +2 more
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Strain-Hardening Creep Relaxation
Journal of Applied Mechanics, 1992Relaxation testing is an important alternative for investigating the creep properties of a material. A solution for the strain-hardening form of the power law is derived and compared to its time-hardening counterpart.
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The secondary hardening phenomenon in strain-hardened MP35N alloy
Acta Materialia, 1998Abstract Mechanical testing and microscopy techniques were used to investigate the influence of aging on the structure and strengthening of MP35N alloy. It was confirmed that aging the deformed material at 600°C for 4 h provided additional strengthening, here referred to as “secondary hardening”, in addition to the primary strain hardening.
S Asgari +4 more
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Geometrically induced strain hardening
Scripta Materialia, 2013Abstract The concept of geometrically induced strain hardening is presented in order to demonstrate how the strain hardening of materials can be improved by the use of architectured reinforcements with corrugated geometries embedded in a matrix. Theoretical computations are highlighted and examples of real materials obtained by different methods are ...
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2009
Introduction With elastic deformation, the strains are proportional to the stress, so every level of stress causes some elastic deformation. On the other hand, a definite level of stress must be applied before any plastic deformation occurs. As the stress is further increased, the amount of deformation increases, but not linearly.
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Introduction With elastic deformation, the strains are proportional to the stress, so every level of stress causes some elastic deformation. On the other hand, a definite level of stress must be applied before any plastic deformation occurs. As the stress is further increased, the amount of deformation increases, but not linearly.
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Strain hardening in polycrystalline copper
Philosophical Magazine, 1964Abstract Strain hardening in polycrystalline copper is shown to be the net result of two competing processes: (i) a basic process of strain hardening which occurs during deformation under a wide range of experimental conditions, and (ii) ‘dynamic recovery’ which removes a proportion of the obstacles produced during deformation.
F. P. Bullen, C. B. Rogers
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