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hypothesized failure causes

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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
... cause. The chapter also provides information on evaluating the hypothesized potential causes. failure causes failure mode assessment and assignment FMA&A; hypothesized failure modes APPROACHES FOR IDENTIFYING potential failure causes have been described in this book, thus far...
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
... Abstract A product pedigree describes its design and how it was built and shows that it was built in accordance with the drawings and other documentation defining the product configuration. Evaluating the pedigree of a failed product can help to rule in or rule out hypothesized failure causes...
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...
Image
Published: 01 December 2009
Fig. 11.1 Failed capacitor. The defective capacitor can easily be seen without magnification. Sometimes, a simple visual inspection can reveal the presence of a hypothesized failure cause. More
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
..., electrical or electronic component failures, electrical arcing, the presence of contaminants, interference fits, poor welds or solder joints, porosity, cuts, scrapes, witness marks, and other conditions. In many cases, hypothesized failure causes may be visible to the naked eye. In these situations...
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
... Design Changes Design changes are usually noted in drawing or specification revisions, so if a design change occurs, finding it is usually straightforward. The failure analysis team should review all relevant design documentation to determine if any changes related to hypothesized failure causes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780189
EISBN: 978-1-62708-268-6
... and Repair Documents Failure analysis findings, including all hypothesized failure causes, can be incorporated in troubleshooting and repair guidelines. Failure Analysis Procedures Many failure analysis procedures consist primarily of administrative guidelines for routing nonconformance...
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 their undeflected configuration when the load has been removed. If the fault tree hypothesizes interference induced by deformation as a failure cause, the failure analysis team can examine suspect parts for witness marks that would indicate the parts interfered with each other. Another approach is to photograph...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780057
EISBN: 978-1-62708-268-6
... the failure analysis team to assess which hypothesized failure causes are more likely to occur. Probability, Failure Rate, and Mean Time Between Failures Probability is a dimensionless number that quantifies the likelihood something is going to occur. It ranges from 0 to 1 (sometimes also referred...
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
... in the development process. If not, the failed item may not have been adequately designed to withstand the environments it experienced. Examples The following examples illustrate the value of design analysis. Springs Whenever the hypothesized failure causes include a spring, the failure analysis team...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780001
EISBN: 978-1-62708-268-6
... team will identify potential causes beyond those that caused the failure under investigation. Even if the failure analysis team determines that these other hypothesized failure causes did not cause the failure being investigated, this approach creates numerous improvement opportunities. The failure...
Image
Published: 01 December 2009
tolerance conditions. An x-ray of the failed mechanism confirmed the failure cause. More
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
... causes of a command event could induce the condition, an OR gate should be used. If all of the hypothesized causes going into a command event are required, an AND gate should be used. Example for Group Discussion In the Chapter 4 examples, potential light bulb illumination failure causes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220667
EISBN: 978-1-62708-259-4
... the fracture started, in an attempt at identifying the probable causes of the failure. The selected techniques focused on fractographic examination of the initiation point and SEM examination of the fracture surface in this location in an attempt to find significant discontinuities that could have caused...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780025
EISBN: 978-1-62708-268-6
... Abstract In the second step of the four-step problem-solving process, the failure analysis team should identify all potential failure causes. This chapter discusses the steps involved in five such techniques for identifying potential causes of failure, namely brainstorming, mind mapping...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780019
EISBN: 978-1-62708-268-6
... not occur when attempts are made to duplicate it, which makes it difficult to isolate the cause. Sometimes, a fix is guessed at and implemented, and the failure goes away. This can lead to a “feel-good” situation, but this feeling is frequently temporary. If something is done to fix an intermittent problem...
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
... Abstract Contaminants can be a cause of numerous types of system failures. There are numerous techniques for confirming contaminant presence. When the presence of a contaminant is suspected, the failure analysis team must find and eliminate the contaminant source, which can be obvious or quite...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
.... The load capacity of the gears should be calculated. For this purpose, obtain the following geometry data from the gears and housing or drawings: During inspection, the analyst will begin to formulate hypotheses regarding the cause of failure. With these hypotheses in mind, select specimens...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110524
EISBN: 978-1-62708-247-1
... on semiconductor lasers. The discussion begins with the basics of semiconductor lasers and the material science behind some causes of device failure. It then covers some of the common failure mechanisms, highlighting the need to identify failures as wearout or maverick failures. The chapter also covers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910475
EISBN: 978-1-62708-250-1
... growth rate. Source: Ref 1 Factors That Influence Corrosion Failures Several factors, as well as the possibility of their interactions, must be considered by the failure analyst in determining whether corrosion was the cause of, or contributed in some way to, a failure and in devising...