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

摘要

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.