The bathtub curve is a particular shape of a failure rate graph. This graph is used in reliability engineering and deterioration modeling. The 'bathtub' refers to the shape of a line that curves up at both ends, similar in shape to a bathtub. The bathtub curve has 3 regions: The first region has a decreasing failure rate due to early failures.

Abstract: This paper describes the relationship between a bathtub curve, failure distributions, and commonly used metrics: mean-time-before failure (MTBF), mean-time-between failure (MTBF), and mean-time-to failure (MTTF) – metrics that are often misunderstood and misused.

The bathtub curve, named for its shape and shown in Fig. 15-11, is perhaps the most famous graphical representation in the field of reliability. Plotted is the failure rate, h ( t ), versus time. The resulting curve describes not only the behavior of engineering components, but also the lifetimes of human populations.

The bathtub curve is widely used in modelling and predicting system failures. It consists of three sections: Early Failures (Infant Mortality) Phase: This phase has a decreasing failure rate. Random Failure (Useful Life) Phase: This phase has a constant failure rate.

Let’s look at the different ways in which a bathtub curve analysis helps you boost an asset’s RUL. Gain prognostic insights. With bathtub curve analysis, you know what assets need system inspections and advanced condition monitoring — both key to preventing asset failure. Manage inventory better.

Utilizing insights from the bathtub curve is key to enhancing asset reliability and extending lifespan. By understanding the different stages of the curve, maintenance teams can implement targeted strategies at each phase to prevent failures and optimize performance.

In the Reliability and Maintenance world, we often refer to what is known as the “bathtub” curve and ask the question: “What is the bathtub curve for this equipment?” The name “bathtub” comes from the equipment failure rate curve resembling a sanitary bathtub’s longitudinal section.

A plot of the failure rate over time for most products yields a curve that looks like a drawing of a bathtub: If enough units from a given population are observed operating and failing over time, it is relatively easy to compute week-by-week (or month-by-month) estimates of the failure rate \(h(t)\).

The bathtub curve is a fundamental concept in reliability engineering, used extensively to describe the life cycle of products, including semiconductors. The curve gets its name from its shape, which resembles the cross-section of a bathtub.

2024年6月18日 · The ‘bathtub curve’ (blue, upper solid line) for Semiconductor Reliability is a combination of a decreasing Early Failure (red dotted line) and an increasing Wear-out Failure (yellow dotted line), plus some Constant (Random) Failure (green, lower solid line).