Residual stress state and hardness depth in electric discharge machining: De-ionized water as dielectric liquid
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Date
2005
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis inc
Abstract
Procedures and results of experimental work to measure residual stresses and hardness depth in electric discharge machined surfaces are presented. Layer removal method is used to express the residual stress profile as a function of depth caused by a die sinking type EDM. Thin stressed layers are removed from machined samples by electrochemical machining. Corresponding deformations due to stress relaxation are recorded for each removal to determine the stress profile from elasticity theory. The relational dependence of the machining parameters with residual stresses is obtained and a semi-empirical model is proposed for plastic mold steel for de-ionized water as dielectric liquid. These stresses are found to be increasing rapidly with respect to depth, attaining to its maximum value, around the yield strength, and then fall rapidly to compressive residual stresses in the core of the material since the stresses within plastically deformed layers are equilibrated with elastic stresses.
Description
Tekkaya, Erman/0000-0002-5197-2948; Elkoca, Oktay/0000-0002-0007-0741; Erden, Abdulsamet/0000-0002-8084-2018; Ekmekci, Bulent/0000-0002-3632-2197
Keywords
EDM, electric discharge machining, residual stresses
Turkish CoHE Thesis Center URL
Citation
50
WoS Q
Q2
Scopus Q
Q2
Source
Volume
9
Issue
1
Start Page
39
End Page
61