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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001517
EISBN: 978-1-62708-217-4
... Abstract The purpose of this investigation was to determine the cause of the ultrasonic signal attenuation noted during an inspection of a composite aircraft component. Although ultrasonics was able to identify the location of the defective areas, destructive analysis had to be utilized...
Abstract
The purpose of this investigation was to determine the cause of the ultrasonic signal attenuation noted during an inspection of a composite aircraft component. Although ultrasonics was able to identify the location of the defective areas, destructive analysis had to be utilized to determine the exact nature of the defect. The investigation describes how cross-sectioning, fractography, and chemical analysis were utilized to determine the type of defect responsible for the signal attenuation.
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
... of corrosion products, the geometry of fracture surfaces, or inaccessibility of the component making chemical analysis a challenge. The investigator must take every precaution to avoid delivering misleading compositional information, and engineering/scientific judgement is key in providing the best possible...
Abstract
Chemical analysis is a critical part of any failure investigation. With the right planning and proper analytical equipment, a myriad of information can be obtained from a sample. This article presents a high-level introduction to techniques often used for chemical analysis during failure analysis. It describes the general considerations for bulk and microscale chemical analysis in failure analysis, the most effective techniques to use for organic or inorganic materials, and examples of using these techniques. The article discusses the processes involved in the chemical analysis of nonmetallics. Advances in chemical analysis methods for failure analysis are also covered.
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006915
EISBN: 978-1-62708-395-9
.... Polymer chains are made up of the repeat units shown, joined end to end. Source: Ref 2 – 7 Abstract This article provides practical information and data on property development in engineering plastics. It discusses the effects of composition on submolecular and higher-order structure...
Abstract
This article provides practical information and data on property development in engineering plastics. It discusses the effects of composition on submolecular and higher-order structure and the influence of plasticizers, additives, and blowing agents. It examines stress-strain curves corresponding to soft-and-weak, soft-and-tough, hard-and-brittle, and hard-and-tough plastics and temperature-modulus plots representative of polymers with different degrees of crystallinity, cross-linking, and polarity. It explains how viscosity varies with shear rate in polymer melts and how processes align with various regions of the viscosity curve. It discusses the concept of shear sensitivity, the nature of viscoelastic properties, and the electrical, chemical, and optical properties of different plastics. It also reviews plastic processing operations, including extrusion, injection molding, and thermoforming, and addresses related considerations such as melt viscosity and melt strength, crystallization, orientation, die swell, melt fracture, shrinkage, molded-in stress, and polymer degradation.
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in Metallurgical Evaluation of a Five Inch Cylindrical Induction Melter
> ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment
Published: 01 June 2019
Fig. 7 Composite photomicrograph showing microstructure of the conical section from the CIM. Note significant grain growth and the lack of voids throughout the cross section. Molten glass attack is visible on ID surface, but no wall thinning occurred.
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in Failure Investigation of a Structural Component of the Main Landing Gear of a Transport Aircraft
> ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
Fig. 8 A composite micrograph showing the profile of the corrosion pit. The arrow from the dotted line marks the depth of the pit. The second arrow in the middle marks the manganese phosphate coating.
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in Stress-Corrosion Cracking of a Stainless Steel Wire-Rope Terminal
> ASM Failure Analysis Case Histories: Material Handling Equipment
Published: 01 June 2019
Fig. 1 Composite micrograph of a transverse section through a type 303(Se) stainless steel eye terminal for a wire rope showing corroded crack surface and final-fracture region. 75×
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in Fatigue Failures of Links from Grab Chains
> ASM Failure Analysis Case Histories: Material Handling Equipment
Published: 01 June 2019
Fig. 2 Composite photomicrograph showing fissures adjacent to fracture. (×50).
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in Metallurgical Failure Analysis of Titanium Wing Attachment Bolts
> ASM Failure Analysis Case Histories: Failure Modes and Mechanisms
Published: 01 June 2019
Fig. 3 Composite stereomicroscope photograph of the left-hand bolt fracture surface inside the nut taken under oblique lighting. The fracture origin is denoted by the arrow.
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in Failure of Rockbolts in Underground Mines in Australia
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 13 Microstructure at center of Bolt 23 (AXR; type E composition)
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in Failure of Rockbolts in Underground Mines in Australia
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 14 Microstructure at center of Bolt 24 (Wriggle; type A composition)
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in Failure of Rockbolts in Underground Mines in Australia
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 15 Microstructure at center of Bolt 14 (AVH; type D composition)
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in Failure of Rockbolts in Underground Mines in Australia
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 16 Microstructure at center of Bolt 4 (Threadbar; type B composition)
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in Failure of Rockbolts in Underground Mines in Australia
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 17 Microstructure at center of Bolt 28 (Tempcore X; type E composition)
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in Failure of Rockbolts in Underground Mines in Australia
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 18 Microstructure at center of Bolt 1 (HPC; type C composition)
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in Cracked Bearing Caps Made of Cast Iron
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 8 Effect of composition on microstructure, radial sections in groove, etch: Picral. Cap of hypoeutectic cast iron. 3 ×
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in Cracked Bearing Caps Made of Cast Iron
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 9 Effect of composition on microstructure, radial sections in groove, etch: Picral. Cap core structure according to Fig. 8 . 200 ×
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in Cracked Bearing Caps Made of Cast Iron
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 10 Effect of composition on microstructure, radial sections in groove, etch: Picral. Cap of hypereutectic cast iron. 3 ×
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in Cracked Bearing Caps Made of Cast Iron
> ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment
Published: 01 June 2019
Fig. 11 Effect of composition on microstructure, radial sections in groove, etch: Picral. Cap core structure according to Fig. 10 . 200 ×
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in Investigation of Cracking and Erratic Behavior of the Uranium-Titanium Alloy
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 5 Composite X-ray imaging of inclusions adjacent to the internal crack that were identified as titanium carbides.
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in Investigation of Cracking and Erratic Behavior of the Uranium-Titanium Alloy
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 6 Elemental and composite images of inclusion cluster identified as titanium carbides on left and uranium oxides on right along the fracture surface.
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