Work out bathtub curve failure rate instantly with clear inputs, formula shown and shareable results.
The bathtub curve has three regimes. Infant mortality shows a falling hazard rate, modelled with a Weibull shape near 0.5 and addressed by burn-in and better process control. Useful life has a constant rate. Wear-out has a rising rate, shape 3 or more, and is addressed by scheduled replacement.
Phase hazard rate
h(t) = base rate x (age / design life)^(beta - 1) with beta 0.5 infant, 1 useful life, 3 wear-out
Plot cumulative failures against age. A concave curve means infant mortality, a straight line means constant rate, a convex curve means wear-out has begun.
No. It helps only in wear-out. Replacing components during infant mortality actively increases failures, because a new part restarts the high-hazard period.