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Performance evaluation

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001781
EISBN: 978-1-62708-241-9
... to construct a finite element model to analyze material performance under failure conditions. In addition, a full scale structural test was conducted to determine failure strength. It was concluded that the club failed not from ground impact but from a force reversal at the bottom of the downswing. Large...
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Published: 01 January 2002
performance evaluation facility equipped with parallel test lines (see Fig. 14 ). More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
... to the performance of cartwheel. Dynamic fracture toughness Fatigue property Performance evaluation Railroad wheels Static mechanical property Fe-0.55C-0.73Mn Fe-0.60C-0.85Mn Fe-0.5C-0.7Mn Rolling-contact wear Spalling wear Fatigue fracture 1. Introduction The railway system in China plays...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006938
EISBN: 978-1-62708-395-9
.... This requirement is related to, but distinct from, the need to assess the role of environmental conditions (both thermal and chemical) on long-term material performance, as discussed in the section “Long Term Performance Evaluations” in this article. Furthermore, the viscoelastic nature of polymeric materials may...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006933
EISBN: 978-1-62708-395-9
... of the failure or, expressed alternatively, evaluating how the part failed and why it failed—requires a scientific approach and broad background knowledge of polymeric materials. Fig. 1 Steps for performing failure analysis. The steps are the same regardless of the material. Failure within plastic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
... alternatively, evaluating how the part failed and why it failed, requires a scientific approach and a broad knowledge of polymeric materials. Fig. 1 Steps for performing failure analysis. The steps are the same regardless of the material Plastic components can fail via many different modes...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001598
EISBN: 978-1-62708-232-7
... was observed leaking from the outside of the drain tube. The CIM was disassembled, and the vessel was cleaned with hydrofluoric acid to remove most of the residual glass in order to perform the metallurgical evaluation. Cleaning took several days to complete. Results Nondestructive Analyses...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006832
EISBN: 978-1-62708-329-4
... affected the safety of the product. Physical Evidence—Product Inspection and Testing At the root of every engineering evaluation is a consideration of all available physical evidence about the product performance and condition immediately preceding the time of and immediately following the incident...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003519
EISBN: 978-1-62708-180-1
..., a good definition of a failure investigation can be an evaluation performed to identify and/or determine the reasons for a failure that clearly identifies the root cause(s) of the failure and recommends corrective action(s). Many failure investigations end after step 2 (determine root cause). It is just...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003515
EISBN: 978-1-62708-180-1
... and operator performance. Range of flaw sizes for which 90% POD has been reported in various studies, conducted over the past 25 years Table 2 Range of flaw sizes for which 90% POD has been reported in various studies, conducted over the past 25 years Nondestructive evaluation method Flaw sizes...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006755
EISBN: 978-1-62708-295-2
... the appropriate corrective action(s). Additionally, it would also be good to provide an evaluation of the solution. Many failure investigations discover the root cause(s) and provide a recommendation for corrective action(s), but no follow-up evaluations are performed to see if the corrective action worked...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090457
EISBN: 978-1-62708-222-8
... occurred as cracking within retaining tabs used to secure a metal slide. The cracking was limited to an older design, with newer components showing no signs of failure. The latch assembly components were injection molded from an unfilled commercial grade of a polyacetal copolymer. As part of the evaluation...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006800
EISBN: 978-1-62708-329-4
... on properties that satisfy those performance needs (see the section “Materials Selection in Design” in this article). Other Specialized Approaches and Tools Many other specialized design team approaches have been developed to evaluate design, primarily for critical systems in which failure can...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003501
EISBN: 978-1-62708-180-1
... those performance needs (see the section “Materials Selection in Design” in this article). Other Specialized Approaches and Tools Many other specialized design team approaches have been developed to evaluate design, primarily for critical systems where failure can be catastrophic. These methods...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006772
EISBN: 978-1-62708-295-2
..., such as operational tests of equipment, may or may not be considered destructive testing, depending on the nature of the accident. The investigator must be careful in evaluating whether examinations that are performed are destructive or nondestructive. The distinction between the two is important in the United States...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c9001631
EISBN: 978-1-62708-222-8
..., the first avenue of evaluation of a failed product is performing simple tests such as chemistry and microhardness traverses for comparison with specific product requirements. However, the lack of any product or performance standard made this avenue unavailable. This lack of availability does not eliminate...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003518
EISBN: 978-1-62708-180-1
... require the assessment of a materials engineer. This is because many design engineers are not very familiar with the natural variations within a material grade. Evaluation of the adequacy of a material or process specification is often best performed by a materials engineer. Thus, materials experts...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003523
EISBN: 978-1-62708-180-1
... of accident scene would require substantial documentation. Fig. 2 Remains surrounding an industrial facility after a fire and explosion A safety evaluation is necessary prior to any investigative work being performed on the scene. Examples of potential safety hazards at accident scenes include...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006809
EISBN: 978-1-62708-329-4
... tends to behave in a ductile fashion and can absorb more energy prior to fracture. The definition of low temperature and high temperature are all relative to the material of construction. To prevent brittle fracture failures, an engineering evaluation is typically performed to establish a minimum...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048498
EISBN: 978-1-62708-234-1
... localized buckling of the skin panel was evident between each of these through-thickness fractures. To define areas of nonvisible damage, that is, delamination, a nondestructive evaluation was performed with TTU. This analysis revealed a roughly 10-cm (4-in.) wide band of delamination between the areas...