Patent attributes
The minimum tensile elongation specification of a manufactured part, such as metal castings, forgings and premium mill products, is verified in-situ using a simple, inexpensive, nondestructive apparatus and method in which a through-hole is formed in the part to be tested. A disposable mandrel having a diameter adapted to expand the hole to the minimum elongation required in the part's specification is pressed into the hole. The presence of radial cracks in the part adjacent to the hole after the mandrel has been pressed in indicates that the part does not meet the specification, and the absence of such cracks indicates that it does. Since the test is performed on the part itself, the cost of the manufacture and testing of tensile test coupons is eliminated, and different areas of the part may be sampled easily, thereby enabling a closer, more thorough evaluation of part's material bulk properties.
