Energy Dissipation During Impact of an Agglomerate Composed of Autoadhesive Elastic-Plastic Particles

The contact area, friction force, and relative displacement evolution at the very early stage of fretting are investigated experimentally. Copper and steel spheres of various diameters are loaded against a hard sapphire flat by a range of normal loads deep into the elastic-plastic regime of deformation. A reciprocating tangential loading is then applied with a maximum loading below the static friction to avoid gross slip. Real-time and in situ direct measurements of the contact area, along with accurate measurements of the friction force and relative displacement, reveal substantial junction growth and energy dissipation mainly in the first loading cycle. The so-called “slip amplitude” is found to be attributed to residual tangential plastic deformation rather than to interfacial slip. Elastic shake-down is observed for the 2.5% hardening steel spheres while plastic shake-down is observed in the case of the elastic perfectly-plastic copper spheres.

Download Full-text

Peel Mechanics for an Elastic-Plastic Adherend

Rubber Chemistry and Technology ◽

10.5254/1.3535254 ◽

1979 ◽

Vol 52 (5) ◽

pp. 1057-1071 ◽

Cited By ~ 7

Author(s):

A. N. Gent ◽

G. R. Hamed

Keyword(s):

Energy Dissipation ◽

Critical Thickness ◽

Adhesive Layer ◽

Published Data ◽

Plastic Yielding ◽

Plastic Strip ◽

Elastic Plastic ◽

Maximum Value ◽

Good Agreement

Abstract The force required to propagate a 180° bend in an elastic-plastic strip has been calculated from elementary bending theory. Measured forces for Mylar strips of various thicknesses, bent to various degrees, were in good agreement with these calculated values. The corresponding additional stripping force in a peeling experiment will depend upon the thickness of the elastic-plastic adherend, becoming zero both for infinitesimally thin adherends and for those exceeding a critical thickness tc and passing through a maximum value at intermediate thicknesses. Published data are in good agreement with these conclusions. For a strongly adhering strip, higher peel strengths are found for a peel angle of 180°, compared to 90°, and the effect is greater than can be accounted for solely by plastic yielding of the adherend. It is attributed in part to greater energy dissipation within the adhesive layer.

Download Full-text

Energy dissipation during normal impact of elastic and elastic–plastic spheres

International Journal of Impact Engineering ◽

10.1016/j.ijimpeng.2005.08.007 ◽

2005 ◽

Vol 32 (1-4) ◽

pp. 593-604 ◽

Cited By ~ 126

Author(s):

Chuan-Yu Wu ◽

Long-Yuan Li ◽

Colin Thornton

Keyword(s):

Energy Dissipation ◽

Normal Impact ◽

Elastic Plastic

Download Full-text

Energy dissipation analysis of elastic–plastic materials

Computer Methods in Applied Mechanics and Engineering ◽

10.1016/j.cma.2017.11.009 ◽

2018 ◽

Vol 331 ◽

pp. 309-326 ◽

Cited By ~ 13

Author(s):

Han Yang ◽

Sumeet Kumar Sinha ◽

Yuan Feng ◽

David B. McCallen ◽

Boris Jeremić

Keyword(s):

Energy Dissipation ◽

Elastic Plastic ◽

Plastic Materials ◽

Elastic Plastic Materials

Download Full-text

Study on Elastic-Plastic Damage Constitutive Model of Frozen Soil Based on Energy Dissipation Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.423-426.1187 ◽

2013 ◽

Vol 423-426 ◽

pp. 1187-1192 ◽

Cited By ~ 1

Author(s):

Zhi Min Li ◽

Tao Liu ◽

Zhi Li Cui

Keyword(s):

Energy Dissipation ◽

Constitutive Model ◽

Damage Mechanics ◽

Yield Criterion ◽

Dissipation Function ◽

Frozen Soil ◽

Elastic Plastic ◽

Plastic Damage ◽

Plastic Dissipation ◽

Damage Constitutive Model

Starting from the thermodynamics, model of frozen soil is studied by energy dissipation theory and the inside and outside the state variables is given under isothermal conditions. Damage of frozen soil is re-flecked by effective stress and damage tensor in Damage Mechanics. Dissipation function is in form of plastic dissipation function (DP yield criterion) and the damage dissipation function. And plastic dissipation function is coupled of the damage variable. Through the elastic-plastic and damage evolution, frozen soil incremental elastic-plastic damage constitutive model is made. And finite element scheme is given.

Download Full-text