Date of Award

Fall 2009

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Abdelmageed A. Elmustafa

Committee Member

Gene J.-W. Hou

Committee Member

Sebastian Bawab

Call Number for Print

Special Collections; LD4331.E56 T568 2009

Abstract

In indentation creep experiments, it is difficult to characterize the mechanical properties of small size specimens using conventional methods. This study uses finite element modeling to investigate rate-sensitive deformation of materials with different hardness and strain rate sensitivities for self similar indenter tip geometries. The simulation model is developed using commercially available finite element software Abaqus/Standard. Our study investigates the difference between strain rate sensitivity of hardness (vH) and of flow stress (vu) and their relation to the hardness/modulus ratio. It reveals that the commonly held assumption that vH = vu is violated except for materials with low hardness/modulus ratio such as soft metals. Also, the ratio vH I vu is found to be a unique function of H IE* , where H is the hardness and E * is the modulus relevant to Hertzian contact. The results of a Berkovich indenter show trends similar to those of a conical indenter.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/yw2j-vh46

Download

Share

COinS