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	First-Order Reliability Method (FORM)	Rainflow-räkning
Ämnesområde	Tillförlitlighetsteknik	Tillförlitlighetsteknik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1969	1974
Upphovsperson	Allin Cornell	Tatsuo Endo
Typ	Reliability analysis method	Cycle counting algorithm
Ursprungskälla	Cornell, C. A. (1969). A probability-based structural code. Journal of the American Concrete Institute, 66(12), 974-985.	Goodman, J. (1899). Mechanics Applied to Engineering. Longman, Green and Co.
Alias	FORM, First-order second-moment method	Rainflow cycle counting, RFC
Närliggande	4	4
Sammanfattning	The First-Order Reliability Method (FORM) is a probabilistic technique for estimating the probability of structural failure given uncertain input parameters. Developed by Allin Cornell in 1969 and refined by Hasofer and Lind in 1974, FORM provides a computationally efficient approximation to the true failure probability by linearizing the limit-state function at the most probable failure point. It has become the cornerstone of modern structural reliability analysis and risk-based design.	Rainflow counting is a fatigue cycle counting method that converts a complex stress history into individual cycles for damage assessment. Developed by Tatsuo Endo and colleagues in 1974, it provides the most physically realistic representation of fatigue damage when combined with Miner's linear cumulative damage hypothesis. The algorithm has become the industry standard in reliability engineering and vibration analysis.