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polymeric materials

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Published: 01 January 2002
Fig. 23 Basic elements of polymeric materials. (See Table 1 for explanation of locations). Source: Ref 6 More
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Published: 01 January 2002
Fig. 6 Differential scanning calorimetry used to identify polymeric materials by determination of their melting point. More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... of creep-related failures, where the mechanical strength of a material becomes limited by creep rather than by its elastic limit. The majority of information provided is applicable to metallic materials, and only general information regarding creep-related failures of polymeric materials is given...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003550
EISBN: 978-1-62708-180-1
... Abstract The article commences with an overview of short-term and long-term mechanical properties of polymeric materials. It discusses plasticization, solvation, and swelling in rubber products. The article further describes environmental stress cracking and degradation of polymers...
Image
Published: 01 January 2002
Fig. 5 Differential scanning calorimetry thermogram showing various transitions associated with polymeric materials. The (I) indicates that the numerical temperature was determined as the inflection point on the curve. 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
... 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
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001391
EISBN: 978-1-62708-215-0
... in the resistance values, resulting in circuit nonperformance at inappropriate times. The low termination strength was attributed to deficient chip design for the intended materials and manufacturing process and exacerbated by the presence of polymeric contamination at the termination interface. Delaminating...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... and brittle fracture, fatigue, creep, and complex environmentally assisted cracking from stress-corrosion cracking and hydrogen embrittlement) is in other articles in this Volume. Articles on the fractographic appearances of polymeric and ceramic materials are also included. Fractography of electronic...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... Chemical analysis, as is normally done for metals, is not sufficient for the characterizing of polymeric materials. The main intrinsic properties that characterize all polymer molecules are their size, weight, and weight distribution; chain stiffness or chain rigidity; the particular state, whether...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... of which all polymers can be classified, are illustrated in Fig. 23 and described with examples in Table 1 . Thermoplastics should, in theory, have no cross linking, but, in practice, small amounts occur as a result of thermal and oxidative degradation or through the processing of the polymeric material...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... of polymeric and ceramic materials are also included. (Fractography of electronic components is addressed in detail in Ref 1 .) In summary, the following are key features in distinguishing between monotonic versus fatigue fracture and ductile versus brittle fractures (on either a macroscale or microscale...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001625
EISBN: 978-1-62708-218-1
... with a ferrous material, such as a steel chip. Chemical analysis Coating defects Discoloration Motorcycle components Polymer (Other, miscellaneous, or unspecified) failure Two acrylic-coated polymeric motorcycle components exhibited fisheye blemishes after painting. Only one imperfection...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001626
EISBN: 978-1-62708-235-8
..., as well as adherent organic residue. Analysis by FTIR of the residue revealed detectable levels of two polymeric substances, which were later determined to be construction materials of the pickling tank. It was recommended that more frequent cleaning and/or replacement of the pickling solution be put...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
..., and material conditions. Computed tomography is used in the medical community for noninvasive x-ray imaging of the human anatomy. The same technique has been applied for 3D nondestructive inspection of components. The method has gained in popularity in the biomedical industry and to inspect polymeric materials...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0090439
EISBN: 978-1-62708-220-4
... Abstract A section of clear polymeric tubing failed while in service. The failed sample had been used in a chemical transport application. The tubing had also been exposed to periods of elevated temperature as part of the operation. The tubing was specified to be a polyvinyl chloride (PVC...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001516
EISBN: 978-1-62708-234-1
.... The substrate can be an aluminum alloy or a polymeric material usually polyethylene terepthalate. The disk drives are accordingly classified as hard or flexible. Recently 3.5″ or smaller disks have been introduced with glass substrates. Magnetic heads are made of a high permeability material, thin laminations...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001297
EISBN: 978-1-62708-215-0
... spar material. Corrosion pits were formed along the contact points between the lead wool fibers and the spar cavity surface. The moisture entry was due to the failure of a thermoset polymeric seal inside the spar cavity. How Failure Could Have Been Prevented The failure could have been prevented...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006759
EISBN: 978-1-62708-295-2
.... Howard, NASA Thermal Analysis as a Tool in Chemical Analysis Thermal analysis of polymeric materials can be used in conjunction with FTIR or Raman spectroscopy to confirm the chemistry of a polymeric material. Although methods such as differential scanning calorimetry and thermogravimetric...
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
... the surrounding polymeric matrix. The fracture surface also showed a network of secondary cracking. Overall, the observations made during the visual and SEM inspections were consistent with molecular degradation associated with chemical attack of the filter component material. Fig. 1 Scanning electron...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003541
EISBN: 978-1-62708-180-1
.... In contrast, cavitation processes in polymers can dominate the plastic deformation. These voids do not coalesce into a crack, but instead become stabilized by fibrils containing oriented polymeric material. The resulting region consisting of voids and fibrils is known as a craze ( Fig. 4 ). The long-chain...