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root cause determination

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180127
EISBN: 978-1-62708-256-3
... professional engineer must improve to conduct an effective and successful failure investigation, namely technical skills, communication skills, and technical integrity. The chapter also provides information on the additional basic tools available for failure investigation and root cause determination: the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270146
EISBN: 978-1-62708-301-0
... wing root fitting Cracking observed in the bottom wing root fitting of an aircraft discovered during major servicing was investigated. The cause was found to be stress corrosion. During a major servicing of an aircraft after 795.35 hours since its last overhaul, cracks were...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180061
EISBN: 978-1-62708-256-3
... statistics including type of failure, material, and root cause. It describes the purpose and benefits of conducting a root cause analysis and the factors, namely relative failure importance and company value, that determine when an investigation should be performed. The chapter also discusses the four-step...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270118
EISBN: 978-1-62708-301-0
... by corrosion pits in the root transition region. The chapter recommends further investigations to determine the cause of pitting, which appears to be confined to the dovetail region. compressor blades corrosion pitting fatigue failure SEM fractography Premature service...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180091
EISBN: 978-1-62708-256-3
... determined the root cause(s), then these recommendations will already have been formulated in your mind. At its onset, every failure investigation should establish four criteria: (1) the priority of the investigation, (2) the resources available, (3) any constraints imposed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110513
EISBN: 978-1-62708-247-1
... to the associated active devices. This article is an update and extension of previous publications ( [1] and [2] ) and includes many new examples of automotive application failures. Due to the interaction between passive and active devices and their stressors, real root cause determination...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110587
EISBN: 978-1-62708-247-1
... Abstract Passive components can be broadly divided into capacitors, resistors, and inductors. Failure analysis of these components helps determine the root cause and improve the overall quality and reliability of the electronic systems. This article describes different failure analysis...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270128
EISBN: 978-1-62708-301-0
... Abstract This chapter discusses the failure of a first-stage compressor blade in an aircraft engine and explains how investigators determined that it was caused by fatigue, with a crack originating from corrosion pits that developed in the root transition region on the convex side of the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270150
EISBN: 978-1-62708-301-0
... A section from the root was cut and prepared for metallographic examination. It was found to contain a few large silicon-rich inclusions. It is obvious that the primary cause of fracture of the blade was fatigue, originating from inclusions present in a critical area. The change in the nature of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110025
EISBN: 978-1-62708-247-1
... buildup contains a high complexity of layers and a multitude of materials. This limits access to the defect site, making it difficult to determine a failure’s root cause. Figure 1 also demonstrates the trends within packaging technologies towards shrinking dimensions. The integration of individual...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180001
EISBN: 978-1-62708-256-3
... failure and determine its root cause. During the investigation, many other design and manufacturing flaws were discovered, with improvements suggested and implemented. Failure investigation has come a long way since the Apollo 1 fire. Those involved in failure investigation have an incredible array of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780025
EISBN: 978-1-62708-268-6
... involved in its use: State the problem. Ask why the problem occurred, and note the answer. Determine if the aforementioned answer defines the root cause of the problem. If the aforementioned answer does not identify the root cause of the problem, examine the answer and ask why it (i.e., the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270005
EISBN: 978-1-62708-301-0
... objective of material failure analysis is determining whether a discontinuity is an actual root-cause (defect) or just an imperfection. Critical engineering assessment of discontinuities is therefore necessary in failure analysis to define whether an imperfection is a defect or simply a harmless...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180029
EISBN: 978-1-62708-256-3
... fails, and everything stops. Failure of a component like a crankshaft, bearing, or bracket is quite obvious, as is failure of a machine—be it a commercial airplane or a nutcracker. Determination of the physical, human, latent, and root causes of the failure usually is achieved. The difficulty of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110262
EISBN: 978-1-62708-247-1
... significantly, as illustrated in Figure 1 . Figure 1 Shrinking technology nodes increase FA cycle time CAD Navigation (CADNav) plays a vital role in reducing the overall time to localize IC failures, determine their root causes and provide feedback to the appropriate team to drive corrective...
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 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 such failures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110506
EISBN: 978-1-62708-247-1
..., manufacturing, and test process. This article discusses five key disciplines of the signature analysis process that need to be orchestrated within the organization: design for test practices, test floor data collection methodology, post-test data analysis tools, root cause theorization, and physical failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110461
EISBN: 978-1-62708-247-1
... Abstract The ultimate goal of the failure analysis process is to find physical evidence that can identify the root cause of the failure. Transmission electron microscopy (TEM) has emerged as a powerful tool to characterize subtle defects. This article discusses the sample preparation procedures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270130
EISBN: 978-1-62708-301-0
... bolt that failed during fitment is marked No. 6. Bolts 1 to 5 showed similar features. The fractures were of the brittle type. The fracture origin was generally at the thread root. In all the bolts, the fracture surfaces were found to be oxidized to varying degrees. They had also suffered considerable...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270196
EISBN: 978-1-62708-301-0
... with plating procedures. The report includes recommendations for improving the quality of the screws. hydrogen embrittlement screws SEM fractography Max screws used in fuel-injection pumps failed during assembly. The fracture initiated at the thread roots. Fractography...