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probability of failure

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780057
EISBN: 978-1-62708-268-6
...Abstract Abstract Quantifying a fault-tree analysis is a useful tool for assessing the most likely causes of a system failure. This chapter addresses fault-tree analysis event probabilities and ranking of failure causes based on these probabilities. Failure rates, failure-rate sources...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780157
EISBN: 978-1-62708-268-6
...Abstract Abstract Failure analysis can sometimes involve considerations of statistics and probability. This chapter reviews some of the basic types of statistical distributions in order to understand some basic principles in their use. The main focus is on the uses of the normal distribution...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550511
EISBN: 978-1-62708-307-2
... is increased, the probability that a weak link will occur and cause the chain to fail also increases. Similarly, the probability of failure of a ceramic component is a function of the volume (or area) of material subjected to the various stress levels. By considering the probability of failure of all...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290193
EISBN: 978-1-62708-319-5
... failure probability, F , at an applied stress, σ, is given by: (Eq 9.2) F σ = 1 − exp − V V O σ − σ U σ O M where V is the sample volume, and σ U is the proof stress that must be exceeded for failure (if the samples are not subjected to proof...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
..., and analysis of data. The information gathered in these stages must be systematically linked to arrive at the cause or the most probable cause of the failure. The use of fault trees is one important diagnostic tool that helps sort out data and identify probable causes. The fault tree method is a procedure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460277
EISBN: 978-1-62708-285-3
... been exposed to temperature as well as mechanical and thermal fatigue, in some cases have been subject to time-dependent inelastic strain or creep, and have probably undergone irreversible microstructural changes. In addition, the repair procedure may induce residual stresses that must be relieved...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610303
EISBN: 978-1-62708-303-4
... res / P s , which is less than j = P u / P s . In concert, the probability of fracture failure has become higher. With a crack of size a , the residual strength is P res . Should a load P = P res occur, then fracture takes place. If a load P res does not occur and service loading...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... estimate for the probability of failure. The yield point in tension is less than it is in compression. By the same token, the creep rate in tension is faster than the creep rate in compression for the same magnitude of applied stress. A relationship between the shear yield point and the uniaxial yield...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780047
EISBN: 978-1-62708-268-6
... event. On simple systems with no redundant design features, the list of failure causes includes many single-point failures or human errors. On more complex systems incorporating redundancy to prevent or at least greatly reduce the probability of undesired events occurring, the failure analysis team...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270092
EISBN: 978-1-62708-301-0
... shaft and beach marks on the piston along with a nick on the opposite side of the barrel. In addition, the metal around the corresponding hole in the rotor had plastically deformed and the slipper pad was gone. Based on the investigation, the failure most likely occurred due to a problem with the spring...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270168
EISBN: 978-1-62708-301-0
... the disc would not have come into direct contact with the fire, the reduction in hardness of the screw is unlikely to have been caused by the fire, which was post failure. It is probable that the LPT blade locking plate would have come out due to the shearing of the screws holding it in the outward...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270196
EISBN: 978-1-62708-301-0
...-injection pumps failed during assembly. The fracture initiated at the thread roots. Fractography indicated brittle intergranular failure. The most probable cause of the failure was hydrogen embrittlement. Max screws failed during assembly in fuel-injection pumps. Their specified heat treatment...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110666
EISBN: 978-1-62708-247-1
... [7] Lawless J. , Statistical Models and Methods for Lifetime Data , Wiley Series in Probability and Mathematical Statistics ( 1982 ) [8] McPherson J. , Reliability Physics and Engineering – Time-To-Failure Modeling , Springer , ( 2010 ). 10.1007/978-1-4419-6348-2_4 [9...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180091
EISBN: 978-1-62708-256-3
... the likelihood of each root cause.” The difference is that the failure investigation team is assessing the probability and assigning priority to each corrective action, combined with a rationale. Repeat the instructions given in step 4 and create a corrective action assessment (CAA) chart. Referring...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780067
EISBN: 978-1-62708-268-6
... failure mode, but the failure analysis team should not use an event probability by itself to assess which of the hypothesized failure modes induced the failure. For this, the team must identify specific actions to evaluate the likelihood of occurrence of each hypothesized failure cause. These actions...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130151
EISBN: 978-1-62708-284-6
...Abstract Abstract This chapter describes cast steel features that may be identified or attributed to component failure during heat treatment or subsequent processing or service, namely porosity (generated by the presence of gas as well as by shrinkage pores), decarburization, cold joint...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030360
EISBN: 978-1-62708-282-2
... Select techniques that meet the requirements of the inspection The primary aim of the decision-making process is to determine whether noninvasive inspection will be capable of offering similar or better control over the probability of failure than would be achieved by internal visual inspection...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780019
EISBN: 978-1-62708-268-6
... be lost, and the remaining signal would still control the servoactuator. The engineers’ reasoning was that the probability of losing all four signals was extremely remote, and that no single-point failure could induce this condition. General Dynamics organized a separate group of engineers to analyze...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110228
EISBN: 978-1-62708-247-1
...Abstract Abstract Diagnosing the root cause of a failure is particularly challenging if the symptom of the failure is not consistently observable. This article focuses on Laser Assisted Device Alteration/Soft Defect Localization (LADA/SDL), a global fault isolation technique, for detecting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310233
EISBN: 978-1-62708-286-0
... to a huge spread in corrosion conditions and materials performance. In the end, one has to balance materials selection between cost (fortunately, 29-4C alloy is nickel free) and probability of failure. Given the number of units produced and the potentially serious consequences of failure, failure rates must...