Accession Number : ADP010190

Title :   Poor Surfaces and Intersections of Surfaces Still Cause Trouble Just Like They Used to Do

Corporate Author : JOINT OIL ANALYSIS PROGRAM PENSACOLA FLTECHNICAL SUPPORT CENTER

Personal Author(s) : Krashes, David ; Scutti, James J.

PDF Url : ADP010190

Report Date : APR 1996

Pagination or Media Count : 11

Abstract : For nearly half a century engineering designers, materials engineers, and metallurgists have known that poorly machined surfaces and sharp 'inside', corners lead to cracking, fatigue, and disastrous failures. Yet, products with these types of deficiencies continue to be produced, having been designed with what is intended to be an ample design factor to avert a potential problem. So often, these products fail. In this paper, we will discuss the effects of surface finish and corner radii on product durability, and provide photographic examples to illustrate the types of failures that occur due to deficient conditions. These failures are well known to failure analysts and engineers in manufacturing, but are worth reviewing here. We will then challenge engineers to specify and inspect for surface finish and fillet radius requirements for their products.

Descriptors :   *SYMPOSIA, *SURFACE FINISHING, *FATIGUE(MECHANICS), *STRESS CORROSION, FRACTURE(MECHANICS), RADIUS(MEASURE), METALLURGY, NOTCH TOUGHNESS, STRESS CONCENTRATION.

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE