Bathtub curve

In reliability engineering and deterioration modeling, a bathtub curve is a failure rate graph that curves up at both ends, similar in shape to a bathtub. The term can also apply to any graph with this shape.

Many but not all electronic consumer product life cycles follow the bathtub curve. It is difficult to know where a product is along the bathtub curve, or even if the bathtub curve is applicable to a certain product without large numbers of products in use and associated failure rate data.

In reliability engineering, the cumulative distribution function corresponding to a bathtub curve may be analysed using a Weibull chart or in a reliability contour map.

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