Comparer des méthodes

	Méthode de Fiabilité d'Ordre Deux (SORM)	Essais de vie hautement accélérés (HALT)
Domaine	Ingénierie de la fiabilité	Ingénierie de la fiabilité
Famille	Process / pipeline	Process / pipeline
Année d'origine	1979	1990s
Auteur d'origine	Bernd Fiessler	William Leis and others
Type	Reliability analysis method	Product reliability testing methodology
Source fondatrice	Fiessler, B., Neumann, H. J., & Rackwitz, R. (1979). Quadratic limit states in structural reliability. Journal of the Engineering Mechanics Division, 105(4), 661-676.	Leis, B. N., & Stephens, D. R. (2011). Reliability methodologies for structural integrity assessment. Journal of Pressure Vessel Technology, 133(5), 051204.
Alias	SORM, Second-order approximation	HALT, Accelerated stress testing, HASS
Apparentées	4	4
Résumé	The Second-Order Reliability Method (SORM) is an extension of FORM that improves failure probability estimates by accounting for the curvature of the limit-state surface at the design point. Introduced by Fiessler, Neumann, and Rackwitz in 1979, SORM provides more accurate approximations for nonlinear failure surfaces while remaining computationally efficient. It has become the standard refinement when FORM accuracy is insufficient.	Highly Accelerated Life Testing (HALT) is a methodology for rapidly identifying design weaknesses and determining the margin between normal operating conditions and product failure. By applying extreme but non-destructive stress profiles (thermal, vibration, etc.), HALT accelerates the failure clock to reveal latent defects in weeks rather than years. Developed intensively from the 1980s onward and refined by practitioners in electronics and mechanical systems, HALT has become essential in accelerated product development and reliability validation.