Subsurface deformation patterns around indentations in work-hardened mild steel
作者:
M.Munawar Chaudhri,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1993)
卷期:
Volume 67,
issue 2
页码: 107-115
ISSN:0950-0839
年代: 1993
DOI:10.1080/09500839308243860
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
By using specially prepared specimens of work-hardened mild steel, subsurface deformation patterns around Vickers, conical and spherical indentations of millimetre dimensions have been determined. It has been shown that in no case does the deformation pattern agree with the predictions of the plasticity theory for a rigid-perfectly plastic material; the material flow pattern is also inconsistent with the radial flow models. Also, plastic natural strains of 2±0·01 and 41±0·001 have been estimated at the tips of a Vickers and a conical (included angle, 45°) indentations respectively. In the case of a spherical indentation of sizea/R= 0·5, whereaandRare the radii of contact and the indenter, respectively, the plastic natural strains are estimated to be 0·1 ±0·05 and 0·15±0·06 atz/a= 0·5 and 0·65 respectively, wherezis the distance measured from the undeformed surface along the load axis.
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