Simulation of Effects Of Grain Scale on Al Polycrystal Strength Using Strain Gradient Plasticity Concept

Acta Metall Sin

2006, Vol. 42

Issue (7): 781-784 DOI:

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Simulation of Effects Of Grain Scale on Al Polycrystal Strength Using Strain Gradient Plasticity Concept

ZHOU Li; LI Shouxin; KE Wei

Shenyang National Laboratory for Materials Science;Institute of Metal Research;

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ZHOU Li; LI Shouxin; KE Wei. Simulation of Effects Of Grain Scale on Al Polycrystal Strength Using Strain Gradient Plasticity Concept. Acta Metall Sin, 2006, 42(7): 781-784 .

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Abstract In order to investigate the effect of grain size on the material strength，in this work, we use the classical plasticity theory and the mechanism-based strain gradient plasticity theory to simulate the stress-strain of Al polycrystals of different grain size. The results indicate that the plastic work hardening of the stress strain curves predicted by the mechanism-based strain gradient constitutive equation indeed increase with the decrease in grain size. The stress-strain curve for grain diameter d=20um is slightly above that predicted by classical plasticity theory, this is to show further that with the increase of grain size, the contribution of strain gradient to the stress is decrease. At the same time, the fit line of the yield strength and grain size by the computing is consistent with the Hall-Petch line.

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Received: 19 August 2005

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I7/781

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