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Evaluation of partial safety factors for establishing acceptable flaws for brittle piping

DSpace at IIT Bombay

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Title Evaluation of partial safety factors for establishing acceptable flaws for brittle piping
 
Creator SRIVIDYA, A
RASTOGI, R
SAKHARDANDE, MJ
 
Description This paper presents a case study on the application of Load and Resistance Factor Design (LRFD) approach to the Section XI Appendix H of ASME Boiler and Pressure Vessel code for flaw evaluation. This study considers a case of brittle piping. The circumferential and longitudinal cracks are considered. Partial safety factors are generated for maximum reliability index of 2.0 in case of circumferential flaws and for two levels of target failure probability (reliability index beta = 2.0, 3.09) in case of longitudinal flaws. The partial safety factors are generated for fracture toughness and applied stress values. The variability in fracture toughness is modeled using Weibull distribution. Coefficient of variation of 10-30% is considered in fracture toughness. The stress is modeled as normal, lognormal and extremal distributions with coefficient of variation of 10-30%. Since the effect of statistical correlation on the load and resistance factors is relatively insignificant for target reliability values of practical interest, the effect of correlated variables may be neglected.
 
Publisher WORLD SCIENTIFIC PUBL CO PTE LTD
 
Date 2011-10-25T05:53:57Z
2011-12-15T09:11:28Z
2011-10-25T05:53:57Z
2011-12-15T09:11:28Z
2004
 
Type Proceedings Paper
 
Identifier Advanced Reliability Modeling,491-498
981-238-871-0
http://dx.doi.org/10.1142/9789812702685_0062
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15621
http://hdl.handle.net/100/2087
 
Source Asian International Workshop on Advanced Reliability Modeling,Hiroshima, JAPAN,AUG 26-27, 2004
 
Language English