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Topic Area: Metals
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Displaying records 31 to 40 of 60 records.
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31. Crack tip opening angle: applications and developments in the pipeline industry
Topic: Metals
Published: 7/1/2009
Authors: Elizabeth S Drexler, Philippe Darcis, Richard Joel Fields, Joseph David McColskey, Christopher N McCowan, Roni Reuven, Thomas Allen Siewert
Abstract: One of the most difficult safety problems associated with gas pipeline to be solved is the control of ductile fracture propagation. To address this issue, the crack tip opening angle (CTOA) criterion is becoming one of the more widely accepted proper ...

32. High Strain Rate Tissue Simulant Measurements Using digital Image Correlation
Topic: Metals
Published: 6/1/2009
Authors: Steven P Mates, Richard L. Rhorer, Richard Everett, Kirth Simmonds, Amit Bagchi
Abstract: Measuring the response of soft materials to high strain rate deformation is extremely challenging because of the difficulty of achieving dynamic equilibrium during high strain rate mechanical testing such as Kolsky bar testing. Digital image correlat ...

33. A reassessment of the Al-Fe system using a four sublattice model for the DO 3 ordering
Topic: Metals
Published: 4/9/2009
Authors: Ursula R Kattner, Bo Sundman, Ikuo Ohnuma, N Dupin, S Fries
Abstract: The Al-Fe system is important in many alloys and the new interest in iron aluminides makes it necessary to improve the modelling of the different ordered forms of the A2 lattice in this system. This has now been done using a 4 sublattice model based ...

34. Thermopower of Co-doped FeSe0.82
Topic: Metals
Published: 4/1/2009
Authors: Evan L. Thomas, Winnie K Wong-Ng, Daniel P. Phelan
Abstract: The effect of cobalt doping (0.05 ≤ x ≤ 0.50) on the thermopower of the newly discovered superconductor FeSe0.82 is investigated through electrical and thermal transport measurements. Our results point to the destruction of superconducti ...

35. Finite-element analysis and experimental investigation of probe shape effect on initial plastic yield
Topic: Metals
Published: 3/3/2009
Authors: Li Ma, Dylan Morris, Stefhanni Jennerjohn, David Bahr, Lyle E Levine
Abstract: Sudden displacement excursions during load-controlled nanoindentation of relatively dislocation-free surfaces of metals are frequently associated with dislocation nucleation, multiplication, and propagation. Insight into the nanomechanical origins of ...

36. 400-Fold Reduction in Saturation Field by Interlayering
Topic: Metals
Published: 1/13/2009
Authors: William F. Egelhoff Jr., John E Bonevich, Philip Pong, John Unguris, Robert D McMichael, Gery R Stafford, Carlos R Beauchamp
Abstract: The buildup of stress with increasing thickness of magnetic thin films is a common phenomenon that often induces undesirable saturation fields that can convert an otherwise magnetically soft film into a magnetically hard one. We have found that by i ...

37. Phase Field Approach to Heterogeneous Crystal Nucleation in Alloys
Topic: Metals
Published: 1/11/2009
Authors: James A Warren, T Pusztai, L Kornyei, L Granasy
Abstract: We extend the phase field model of heterogeneous crystal nucleation developed recently [L. Granasy, T. Pusztai, D. Saylor, and J. A. Warren, Phys. Rev. Lett. 98, 035703 (2007)] to binary alloys. Three approaches are considered to incorporate foreign ...

Topic: Metals
Published: 1/5/2009
Authors: Angelique N Lasseigne, Kamalu Koenig, David Olson, Brajendra Mishra, Joshua Jackson, Thomas Allen Siewert, Joseph David McColskey
Abstract: New higher strength pipeline steels (X100 and X120) exhibit lower tolerance for hydrogen (diffusible and formed hydrides) before significant degradation or failure occurs. It is essential to have advanced sensors to monitor the hydrogen content and ...

39. Instrumented Impact Test: Impact Machine Variables and Specimen Position
Series: NIST Interagency/Internal Report (NISTIR)
Topic: Metals
Published: 1/5/2009
Author: Christopher N McCowan
Abstract: An investigation has been conducted on the influence of impact machine variables and specimen positioning on characteristic forces and absorbed energies from instrumented Charpy tests. Brittle and ductile fracture behavior has been investigated by te ...

40. Instrumented Impact Tests: Effects of Machine Variables and Specimen Position
Topic: Metals
Published: 1/1/2009
Authors: Christopher N McCowan, Enrico Lucon
Abstract: An investigation has been conducted on the influence of impact machine variables and specimen positioning on characteristic forces and absorbed energies from instrumented Charpy tests. Brittle and ductile fracture behavior has been investigated by te ...

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