Method for determining the micro impact energy capacity of the s

Details Method for determining the micro impact energy capacity of the s Method for determining the micro impact energy capacity of the s

1989-06-30

1991-01-29

Ruehl, Charles A.

Measuring and testing

Testing by impact or shock

Specimen impactor detail

73 82, G01N 330, G01N 348

Patent

active

049877666

ABSTRACT:
A method for determining the micro impact energy capacity of a disk drive's ceramic heads and its thin film disks. The impact energy capacity of disk drive heads (typically composed of ceramic materials) and disks (higher capacity disks use thin film media) provides a measure of quality and durability of the heads and media. The method includes dropping an indentor of a known weight on a sample surface, measuring the identation surface area and length, increasing the weight and repeating the previous steps at different areas o the surface until surface cracking occurs. The various measurements are plotted to produce a stress-strain curve, the area of which comprises the micro energy capacity of the surface.

REFERENCES:
patent: 4621523 (1986-11-01), Shabel et al.
patent: 4820051 (1989-04-01), Yanagisawa et al.

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