What Is Reliability Design

Consumer products, industrial machinery, and military equipment are intently evaluated for reliability of performance and life expectancy

. Although the "military" and particular industrial users (for example, power plants both fossil fuel and nuclear fuel) have always followed some sort of reliability programs, consumer products have of late received the widest attention and publicity. One of the most important foundations for product reliability is its design, and it is apparent that the designer should at least be acquainted with some of the guidelines. Thomas Sabo Rings

The article entitled "A Manual of Reliability" offers the following definition of reliability: "Reliability is the probability that a device will perform without failure a specific function under given conditions for a given period of time" . From this definition, we see that a thorough and in-depth analysis of reliability will involve statistics and probability theory.

All products, systems, assemblies, components and parts exhibit different failure rates over their service lives. Although the shape of the curve varies, most exhibit a low failure rate during most of their useful lives and higher failure rates at the beginning and end of their useful lives. The curve is usually shaped like a bathtub as is shown in Fig. 5. 1. Infant mortality of manufactured parts occurs because a certain percentage, however small, of seemingly identical parts are defective. If those parts are included in a system, the system will fail early in its service life. Product warranties are usually designed to reduce customer losses due to infant mortality. Parts wear out due to friction, overload, plastic deformation, fatigue, changes in composition do to excessive heat, corrosion, fouling, abuse, etc.

The reliability of a part or system is a function of many factors. Reliability is related to failure rate by equation (5-1).

R = 1-F(5-1)

Where R is reliability, 0

by: allanleelovemonica

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