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failure mode assessment and assignment

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780067
EISBN: 978-1-62708-268-6
... Abstract Failure mode assessment and assignment (FMA&A) is a tool designed to help organize the evaluation of hypothesized failure modes. This chapter begins by describing the process of preparing an FMA&A. It then describes the follow-on activities to evaluate the hypothesized failure...
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...
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
... Abstract After the failure analysis team hypothesizes failure causes, prepares a failure mode assessment and assignment, and evaluates all potential failure causes, it may find in some cases that several causes are still suspect but cannot be confirmed. In this situation, an experiment...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780189
EISBN: 978-1-62708-268-6
...” technique, or fault-tree analysis. List each potential failure cause in a failure mode assessment and assignment. Use appropriate documentation reviews, interviews, design analyses, hardware analyses, and designed experiments to converge on the root cause. Identify potential interim and long-term...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780075
EISBN: 978-1-62708-268-6
.... This chapter describes various areas that can be examined by the failure analysis team to assess the pedigree of the failed system. If the failure analysis team suspects product pedigree anomalies it should confirm conformance through independent means. failure analysis failure mode assessment...
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
... test 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...
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
... of a failure, and it also exposes and identifies actions to prevent other failures. Corrective Action Implementation The failure analysis team can use the failure mode assessment and assignment (FMA&A) for assigning corrective actions, just as it did for failure-cause evaluation actions. The FMA...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780001
EISBN: 978-1-62708-268-6
... 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 analyses, hardware analyses...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780109
EISBN: 978-1-62708-268-6
... to 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...
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
... assign a tolerance of 0.003 in. to a nominal dimension of 3.125 in. because there are three places to the right of the decimal point, 0.010 in. to a nominal dimension of 3.25 in. because there are two places to the right of the decimal point, and so on. Circuit Performance Some failure analyses...
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
..., the failure analysis team should focus on areas identified in the failure mode assessment and assignment (FMA&A). Changes in designs, processes, tooling, operators, and environment occur almost constantly, so it is likely that the failure analysis team will find changes that occurred at approximately...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... for failure investigation but can also help in safety analysis of complex systems. By assigning numbers to the probability of occurrence of each basic event, the overall probability of occurrence of the top event can be evaluated. 5.7 Failure Modes and Effects Analysis (FMEA) As previously noted, FMEA...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180091
EISBN: 978-1-62708-256-3
... Abstract This chapter describes the nine steps of a failure investigation. The steps add detail to the problem-solving process introduced in Chapter 3. The first five steps are (1) understanding and negotiating the investigation goals, (2) obtaining an understanding of the failure, (3...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610001
EISBN: 978-1-62708-303-4
... analytical modeling and prediction techniques, accurate life-assessment methods, and a fortified commitment to avoid the recurrence of these failures through improved designs. The examples cited in Table 1 were serious and often tragic failures that had a great impact on structural designs and life...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410009
EISBN: 978-1-62708-280-8
..., are leak-tested in machined condition. Both the product designer and the casting engineer prepare failure mode analyses. These analyses list all the potential ways either a design or the process can fail, impairing the product quality or consistency, and what preventive measures or controls need...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110032
EISBN: 978-1-62708-247-1
... are then assigned, using historical data for a specified reference period, to one or more of these activities. Each activity and associated cost is then inspected in detail to assess its relevance to the mission of the organization and its efficiency. The entire organization is invited to “brainstorm” ideas...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030360
EISBN: 978-1-62708-282-2
... to ensure their continued integrity and fitness for future service. To this end, it is important that a review is carried out on all plant items to assess those that pose the greatest risk. This process of risk assessment will identify the hazards associated with each item, the likelihood of failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780047
EISBN: 978-1-62708-268-6
... events, environmental conditions, and human error. These may not always be present, but the failure analysis team should always ask if such conditions are additional failure causes. Asking this question at each state-of-the-part situation frequently unearths previously unidentified failure modes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110447
EISBN: 978-1-62708-247-1
... One of the typical failure modes is a defect caused by the entrapment of a particle between bond wires or between lead fingers. These particles can result in an open or a short. The particle surface to be analyzed can be as small as 10-20 by 5 micron. This limits the application of some of the surface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.9781627082563
EISBN: 978-1-62708-256-3