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Prediction of plastic deformation under contact condition by quasi-static and dynamic simulations using explicit finite element analysis

Siswanto, W. A. and Nagentrau, M. and Mohd. Tobi, A. L. and Tamin, M. N. (2016) Prediction of plastic deformation under contact condition by quasi-static and dynamic simulations using explicit finite element analysis. Journal of Mechanical Science and Technology, 30 (11). pp. 5093-5101. ISSN 1738-494X

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Abstract

We compared the quasi-static and dynamic simulation responses on elastic-plastic deformation of advanced alloys using Finite element (FE) method with an explicit numerical algorithm. A geometrical model consisting of a cylinder-on-flat surface contact under a normal load and sliding motion was examined. Two aeroengine materials, Ti-6Al-4V and Super CMV (Cr-Mo-V) alloy, were employed in the FE analysis. The FE model was validated by comparative magnitudes of the FE-predicted maximum contact pressure variation along the contact half-width length with the theoretical Hertzian contact solution. Results show that the (compressive) displacement of the initial contact surface steadily increases for the quasi-static load case, but accumulates at an increasing rate to the maximum level for the dynamic loading. However, the relatively higher stiffness and yield strength of the Super CMV alloy resulted in limited deformation and low plastic strain when compared to the Ti-6Al-4V alloy. The accumulated equivalent plastic strain of the material point at the initial contact position was nearly a thousand times higher for the dynamic load case (for example, 6.592 for Ti-6Al-4V, 1.0 kN) when compared to the quasi-static loading (only 0.0072). During the loading step, the von Mises stress increased with a decreasing and increasing rate for the quasi-static and dynamic load case, respectively. A sudden increase in the stress magnitude to the respective peak value was registered due to the additional constraint to overcome the static friction of the mating surfaces during the sliding step.

Item Type:Article
Uncontrolled Keywords:Aluminum, Cylinders (shapes), Dynamic loads, Elastoplasticity, Molybdenum, Numerical methods, Plastic deformation, Stiction, Stress analysis, Titanium alloys, Vanadium alloys, Dynamic explicit, Equivalent plastic strain, Flat surfaces, Quasi-static, Super CMV, Ti-6 Al-4 V, Finite element method
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:71935
Deposited By: Fazli Masari
Deposited On:20 Nov 2017 08:18
Last Modified:20 Nov 2017 08:18

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