Bathtub Curve Infant Mortality

This is normally termed infant mortality. The bathtub curve is generated by mapping the rate of early infant mortality failures when first introduced the rate of random failures with constant failure rate during its useful life and finally the rate of wear out failures as the product exceeds its design lifetime.

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Higher probability for early failures upon first use and burn in period.

Bathtub curve infant mortality. Part one examined the first period of the curve infant mortality and also discussed issues related to burn in a common practice to reduce the occurrence of this type of failure during the useful life of the product. The first downward portion of the curve is called an infant mortality phase and shows how. This decreasing failure rate.

Part two presented here will address the middle and last periods in the bathtub curve. The bathtub curve is a type of model demonstrating the likely failure rates of technologies and products. This plot shows ten years 87 600 hours of time on the x axis with failure rate on the y axis.

In section 1 3 8 the famous bathtub curve so named for its shape was introduced as a way to plot failure rates over product life cycles. Infant mortality curve failure rate vs. It reflects large numbers of failures in the early life of a product.

Zone 1 is the infant mortality period is characterized by an initially high failure rate. One might question whether predominantly electronic equipment will even reach zone 3 of the bathtub curve. The initial region that begins at time zero when a customer first begins to use the product is characterized by a high but rapidly decreasing failure rate.

The bathtub curve reproduced below is to used in reliability engineering to define the levels of risk for hazard function failure during the lifecycle of a given component. Normal life or useful life and end. The second feature of the bathtub curve is the flat central portion.

Over a certain product lifetime the bathtub curve shows how many units might fail during any given phase of a three part timeline. This is normally the result of poor design the use of substandard components or lack of adequate controls in the manufacturing process. It is rare to have enough short term and long term failure information to actually model a population of products with a calibrated.

The early failure or infant mortality regime has for understandable reasons been the subject of considerable scrutiny for many years. The bathtub curve is typically used as a visual model to illustrate the three key periods of product failure rate and not calibrated to depict a graph of the expected behavior for a particular product family. It looks a lot like the infant mortality and normal life portions of the bathtub curve in figure 1 but this curve models only infant mortality decreasing failure rate.

This region is known as the early failure period also referred to as infant mortality period from the actuarial origins of the first bathtub curve plots.

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