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fault tree

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780035
EISBN: 978-1-62708-268-6
... Abstract Fault-tree analysis is a graphical technique that identifies all events and combinations of events that can produce an undesired event. This chapter emphasizes several fault-tree analysis concepts, examining with examples how all three categories of charting symbols (events, gates, and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780047
EISBN: 978-1-62708-268-6
... Abstract This chapter covers special fault-tree analysis topics, including the use of transfer symbols, INHIBIT gates, sequential AND gates, state-of-the-part versus state-of-the-system considerations, and the fault tree to identify redundancy-defeating failures. INHIBIT gates sequential...
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 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, probability...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780093
EISBN: 978-1-62708-268-6
... Abstract After the fault-tree, a failure-cause identification method has identified potential failure causes and the failure analysis team has prepared a failure mode assessment and assignment (FMA&A). The team knows specifically what to search for when examining components and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... chapter also covers quantitative fractography, fracture surface topography analysis, and the use of oxide dating as well as fault tree and failure modes and effects analysis (FMEA) and computational techniques. fault tree analysis fracture surface topography analysis oxide dating quantitative...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110228
EISBN: 978-1-62708-247-1
..., a fault tree analysis, or a hypothesis of the root cause. The only necessary deliverables are the failing DUT, the test that demonstrates the failure, and the voltage, frequency or other bias conditions that modulate the failure. The bias conditions are available as a Shmoo plot [4] . LADA/SDL...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780067
EISBN: 978-1-62708-268-6
... have included brainstorming, mind mapping, Ishikawa diagrams, the “five whys” technique, flow charting, and fault-tree analysis (which, as previously noted, is preferred). After using one or more of these techniques to identify potential failure causes, the failure analysis team may have hundreds or...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180091
EISBN: 978-1-62708-256-3
... corrective actions include the casting process, the forging process, the heat treatment process, and nondestructive evaluations. Three of the corrective actions are directly related to the fault tree ( Fig. 3 ), but the nondestructive evaluations constitute a new category for preventive action. The four...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780189
EISBN: 978-1-62708-268-6
... POINT, the discussions on systems failure analysis have covered many topics, including: Defining the problem Unearthing potential failure causes using brainstorming, mind mapping, the “five whys” technique, Ishikawa diagrams, and fault-tree analysis Managing the failure analysis using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780025
EISBN: 978-1-62708-268-6
... causes. There are several approaches for doing so: Brainstorming Mind mapping Ishikawa diagrams The “five whys” technique Flow charting Fault-tree analysis Each of the aforementioned techniques is useful for identifying potential failure causes, but fault-tree analysis is, by...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780147
EISBN: 978-1-62708-268-6
... mistake. It sends power or a signal to a location it is not supposed to. Sneak-circuit analysis is a specialty capability offered by only a few suppliers, and it is expensive, but it is not really necessary if the failure analysis team uses the fault-tree analysis technique to identify all potential...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780019
EISBN: 978-1-62708-268-6
... incomprehensible. It was precisely this hypothesized system failure that led to the creation of the fault-tree analysis technique. The U.S. Air Force realized it had no analytical tool that could adequately define (and thereby allow people to prevent) conditions that would result in such an event. To respond to...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780109
EISBN: 978-1-62708-268-6
... correct the conditions that allowed these nonconformances to occur, but the team cannot jump to the conclusion that just because a component is nonconforming it must have caused the failure. Each nonconformance should be compared to the fault-tree analysis and the failure mode assessment and assignment...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780001
EISBN: 978-1-62708-268-6
.... Identify all potential failure causes using brainstorming, mind-mapping, Ishikawa diagrams, flow charting, the “five whys” technique, or fault-tree analysis. List each potential failure cause in the failure mode assessment and assignment. Use appropriate documentation reviews, interviews, design...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780081
EISBN: 978-1-62708-268-6
.... Then, during one of the monthly flight lot-acceptance tests, one of the dispensers failed to open. After preparing a fault-tree analysis, the failure analysis team examined components from the recovered (and unexploded) cluster bomb dispenser. The returned components had been damaged too severely...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780171
EISBN: 978-1-62708-268-6
... these modifications fixed the intermittent failures to cut and clamp the hose. The aerial refueling system manufacturer assigned a failure analysis team to investigate and correct the guillotine problems. The failure analysis team prepared a fault-tree analysis with the top undesired event...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180127
EISBN: 978-1-62708-256-3
... seen, three basic tools that are helpful in any failure investigation are a fault tree, a failure mode assessment (FMA) chart, and a technical plan for resolution (TPR) chart. They provide a documented, interchangeable, and concise set of information to ensure that all possible root causes are...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780141
EISBN: 978-1-62708-268-6
... cycles. The failure analysis team prepared a fault-tree analysis and a failure mode assessment and assignment. One of the hypothesized failure modes was epoxy disbonding due to the presence of contaminants on the bonding surface. The failure analysis team examined the failed bond joints and discovered...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780183
EISBN: 978-1-62708-268-6
... find that you are rejecting several each week for short circuits within the harness assembly. After developing a fault-tree analysis and an FMA&A, you disassemble the harnesses and discover that the insulation on wires is nicked and torn. After interviewing the manufacturing technicians, you...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180061
EISBN: 978-1-62708-256-3
... example. Timing the introduction of certain members onto the team also can help maintain organization and coordination. The first order of business is to develop a fault tree, with all possible root causes listed and categorized. At the same time, all possible information about the part and how it was...