open access

https://hdl.handle.net/2115/100462

Estimating Lifetime Models from Field Load Spectra using Damage Accumulation Modeling

英語

Field Data Analysis

2026-07-01

Proceedings of the 10th International Symposium on Reliability Engineering and Risk Management (ISRERM 2026)

Accurate lifetime models are essential for reliability assessment and design validation in industrial development. However, deriving such models from laboratory testing is often costly and time-consuming as it typically requires experiments at several load levels and repeated tests to characterize statistical scatter. In practice, it is possible that comprehensive test data are unavailable, while failed components and the corresponding field load spectra are available. This paper presents a simple engineering approach for estimating lifetime model parameters directly from failure-related field load spectra. In contrast to more advanced statistical methods, the proposed approach does not require maximum likelihood estimation, repeated testing at multiple load levels, or knowledge of the exact load sequence. Instead, each observed Spectrum leading to failure is interpreted as representing a complete damage event. Based on linear damage accumulation, the spectra are normalized and the model parameters are reconstructed by minimizing the deviation of accumulated damage from unity across multiple spectra.

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