A quantitative modeling of the unloading behavior of metals during a tensile test
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Se´bastien Allain
Abstract
This work proposes an original quantitative approach to understand the backward plastic strain resulting from the unloading of a polycrystalline metal during an interrupted tensile test. Based on a prior model by Salama and Roberts, the main assumption is that the relaxed plastic strain is due to the small relaxation of mobile dislocation loops, also responsible for the internal stresses. During unloading, the number of dislocation loops per active source remains constant, but they move backwards as the applied stress decreases. Thus, the main challenge consists in the quantitative estimation of each hardening component and their variations, upon loading and during the unloading sequences, without reverse straining. The model is applied in the case of an interstitial-free steel, with excellent agreement. This study provides a more consistent framework related to the evaluation of the Bauschinger effects in metals avoiding the ambiguity on the choice of the plastic strain offset.
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© 2010, Carl Hanser Verlag, München
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Artikel in diesem Heft
- Basic
- High-temperature in-situ microscopy during stress-induced phase transformations in Co49Ni21Ga30 shape memory alloy single crystals
- Contents
- contents
- Editorial
- Editorial December 2010
- Basic
- Atomic mobilities and diffusivities in the fcc, L12 and B2 phases of the Ni-Al system
- Experimental investigation of the Zn–Fe–V system at 450°C
- Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al–Cu–Ag alloys
- Reassessment of the Mg–Ge binary system using CALPHAD supported by first-principles calculation
- A quantitative modeling of the unloading behavior of metals during a tensile test
- A technique for diameter enlargement in SiC crystal growth
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- Microstructure and mechanical properties of Zn25Al3Cu based composites with large Al2O3 particles at room and elevated temperatures
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- Enhanced photocatalytic activity of beryllium doped titania in visible light on the degradation of methyl orange dye
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