Browse Prior Art Database

Ductility Measurement for Thin Plating

IP.com Disclosure Number: IPCOM000038057D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Engel, PA: AUTHOR [+2]

Abstract

Disclosed is a test or measurement procedure which can determine the allowable strain in the top layer of a solid, plated structure. The test uses a sharp indenter which is pressed against the plated surface with known force. Subsequent to indentation, the vicinity of the crater is checked for cracks, to verify the level of ductility or the lack of it; the amount of strain (the measure of ductility) is calculated from the size of the indentation, and may be related to the indenting force for quantitative engineering treatment.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 92% of the total text.

Page 1 of 1

Ductility Measurement for Thin Plating

Disclosed is a test or measurement procedure which can determine the allowable strain in the top layer of a solid, plated structure. The test uses a sharp indenter which is pressed against the plated surface with known force. Subsequent to indentation, the vicinity of the crater is checked for cracks, to verify the level of ductility or the lack of it; the amount of strain (the measure of ductility) is calculated from the size of the indentation, and may be related to the indenting force for quantitative engineering treatment.

The indenter to be used is a diamond cone (of approximately 60 degree included angle) which ends in a spherical cap (approximately 1 mil radius). The radial strain caused in the axially symmetrical arrangement is calculated at the crater's edge; see Figure.

When the presence of surface cracking is noted, usually by scanning electron microscope, it is possible that the strain caused by the indentation exceeded the ductility of the surface film throughout its depth. Further observation, by EDX (an X-ray procedure) is also desirable, in order to check whether the substrate material is revealed underneath the surface layer. If the latter is shown, then through-the-depth failure of the top layer has been demonstrated.

The indentation test is performed at successive magnitudes of indenting force, producing increasing strain values in the top layer. The value of ductility is that last strain level at which no...