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material characteristics

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Published: 30 August 2021
Fig. 4 Distribution of required hardness within the thickness of the material (it follows the maximum shear stress, τ shear , below the surface) under normal compressive load, F compr (most loaded rolling element), where curve 1 is shear stress, τ shear , and curve 2 is material More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006914
EISBN: 978-1-62708-395-9
... may dilute the combustible gas/oxygen mixture and also reduce the temperature of the flame ( Ref 8 ). Ignition is affected by the temperature and composition of the gas mixture, and by several material characteristics: the flash-ignition temperature (temperature at which decomposition gases can...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0090947
EISBN: 978-1-62708-225-9
... for wear resistance, but the hardened structure has relatively poor ductility. Stress concentration occurs at the ligaments of hardened microstructure between the soft inclusions. These materials characteristically have low transverse mechanical properties, even when they are not case hardened. The level...
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
..., failure analysts need to understand the underlying principles and practices of design and materials selection as basic tools in failure prevention. However, failure analysts also recognize that the synergistic effects of service conditions, manufacturing effects, and material characteristics...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090430
EISBN: 978-1-62708-222-8
... on quality-control hold. Investigation included visual inspection, 24x micrographs, and FTIR in the reflectance mode. The spectrum obtained on the included material was characteristic of polybutadiene, the rubber-modifying agent present in ABS. This supported the conclusion that the inclusion's most likely...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047428
EISBN: 978-1-62708-235-8
.... Given the small critical crack sizes characteristic of ultrahigh-strength materials, it is generally unwise to weld them. It is particularly inadvisable to hardface ultrahigh-strength steel parts with hard, brittle, crack-prone materials when high service stresses will be encountered. The operators...
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
... characteristics are not always captured within the discrete attributes of a design process. Therefore, the analysis of failed parts can provide important insights for metallurgists and other engineers involved with design in general and materials selection in particular. Design also sometimes can...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006756
EISBN: 978-1-62708-295-2
.... What properties were required during service? How were properties expected to change from service exposure? How was the part inspected during service intervals? What information was found during these inspections? What material characteristics were specified for the part (e.g., composition...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090433
EISBN: 978-1-62708-218-1
.... The thermogram obtained on the failed clip material also showed a melting point characteristic of a nylon 6/6 resin. However, no evidence was found to indicate a transition corresponding to the hydrocarbon-based modifier found in the control clip material. Fig. 1 The DSC thermogram representing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003521
EISBN: 978-1-62708-180-1
... these inspections? What material characteristics were specified for the part (e.g., composition, strength, hardness, impact, and stress-rupture properties)? What specifications, industry standards, and contracts govern these properties? What were the various ways the part could fail? The last item...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0090460
EISBN: 978-1-62708-234-1
... image showing features characteristic of severe degradation of the filter material. 118× To allow further assessment of the failure, a mounted cross section was prepared through one of the cracks. The cross section, as presented in Fig. 2 , showed a clear zone of degradation along the surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090424
EISBN: 978-1-62708-222-8
... micro-FTIR in the attenuated total reflectance (ATR) mode. The obtained spectrum exhibited absorption bands characteristic of polycarbonate, as shown in Fig. 1 . No evidence of material contamination was found. A similar analysis was performed on the part surface in an area that showed the anomalous...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0090463
EISBN: 978-1-62708-234-1
... with the exertion of stresses below the yield point of the material, over an extended period of time, by a creep mechanism. Fig. 2 Scanning electron image showing characteristic brittle fracture features on the housing crack surface. 100× The housing base material was analyzed using micro-FTIR...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001128
EISBN: 978-1-62708-214-3
... Abstract Creep crack growth and fracture toughness tests were performed using test material machined from a seam welded ASTM A-155-66 class 1 (2.25Cr-1Mo) steel steam pipe that had been in service for 15 years. The fracture morphology was examined using SEM fractography. Dimpled fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0060097
EISBN: 978-1-62708-219-8
... by metallographic examination. The fracture features were found to be characteristic of an overload failure in a ductile material. The ruptured tubes were concluded as a result of examination to have failed as a result of excessive internal pressure. The source of the excessive internal pressure was assumed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090466
EISBN: 978-1-62708-218-1
... of the parts. While resins for both failed and non-failed parts produced results characteristic of a 13% glass-fiber-reinforced, impact-modified nylon 6/6, the failed part material, contained a significantly lower level of rubber, which rendered the parts less impact resistant and subsequently lowered...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047840
EISBN: 978-1-62708-223-5
... by metallographic examination. A microstructure of fine tempered martensite containing some carbide particles was exhibited by the core material away from the hole. Brittle fracture characteristics with beach marks were exhibited by the fracture surfaces which is characteristic of a torsional fatigue fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090448
EISBN: 978-1-62708-222-8
... Scanning electron image showing brittle fracture features at the crack initiation site, characteristic of environmental stress cracking. 24× Micro-FTIR in the ATR mode was performed on the housing material, and the resulting spectrum was in agreement with the stated resin description, a blend of PC...
Image
Published: 15 May 2022
Fig. 32 Differential scanning calorimetry thermogram comparison of first heating results for the (a) molding resin and (b) failed part. An endotherm is present in the results obtained on the failed window material. The endotherm is characteristic of the melting of crystalline structure within More
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
... center on the techniques used to evaluate the composition and structure of the material. Unlike metals, polymers have a molecular structure that includes characteristics such as molecular weight, crystallinity, and orientation, and this has a significant impact on the properties of the molded article...