The Interpretation of Hardness Measurements Applied for the Determination of the Strain Rate Sensitivity

One of the most important characteristics of the deformation process is the strain rate sensitivity defined by m={( delta ln sigma )/( delta ln epsilon )} sub epsilon . There are various proposals and experimental evidences that show it can be evaluated from the hardness measurements. The physical b...

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Bibliographic Details
Published in:Key engineering materials 1994-01, Vol.97-98, p.169-176
Main Authors: Juhász, András, Tasnádi, P., Nguyen, Quang Chinh, Kovács, I.
Format: Article
Language:English
Online Access:Get full text
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Summary:One of the most important characteristics of the deformation process is the strain rate sensitivity defined by m={( delta ln sigma )/( delta ln epsilon )} sub epsilon . There are various proposals and experimental evidences that show it can be evaluated from the hardness measurements. The physical background is discussed in the present paper. Evaluation of the strain rate sensitivity from the hardness measurement is interpreted by dimensional analysis and on the basis of a simple model for the stress field developing under the indenter. Using this model, the indentation length-time function can be determined, and it is shown that it gives a possibility of the determination of the activation energy of the process.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.97-98.169