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plained best by referring to the so-called bathtub curve, Figure 1(a). The curve describes the development of the number of failures per unit of time, the failure rate λ(t), according to the age of the component. This bathtub curve describes the failure rate of the power components discussed in the case studies. The shape of the failure rate curve in region I is characterized by a decrease, indicating failures in early life. The so called useful life (II), in the restricted time region, shows a constant failure T

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