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You searched on: Author: joseph mccolskey

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41. Mechanical Behavior of Contact Aluminum Alloy
Published: 1/1/2003
Authors: David Thomas Read, Yi-Wen Cheng, Joseph David McColskey, R R Keller
Abstract: Here we report the results of tensile tests of thin films of Al-0.5 % Cu deposited on bare silicon. This material was on a wafer that was subjected to the complete CMOS fabrication process, tensile strength, and elongation were all lower than the co ...

42. Failure Analysis of the WWVB Tower
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6619
Published: 8/1/2002
Authors: Joseph David McColskey, Christopher N McCowan, Raymond L Santoyo
Abstract: A failure analysis was conducted on the collapse of the NIST WWVB tower. The analysis included mechanical testing, chemical analysis, and metallographic examination of the failed part. We ascertained that the underlying reason for the collapse was ...

43. Measurement of Residual Stress in Bent Pipelines
Published: 6/1/2002
Authors: G A Alers, Joseph David McColskey
Abstract: Buried gas and oil pipelines can be subjected to unexpected bending loads causedby such earth movements as earthquakes, wash-outs, road building, mining subsidence, well as by denting from unintentional digging. In order to make a fitness-for ...

44. Tensile Properties of Free-Standing Aluminum Thin Films
Published: 9/1/2001
Authors: David Thomas Read, Yi-Wen Cheng, R R Keller, Joseph David McColskey
Abstract: Tensile properties of electron-beam-deposited free-standing aluminum thin films were measured. High {sigma}^dy^ and UTS were observed, mainly due to fine grain sizes, consistent with values reported in the literature. The observed Young's modulus, ...

45. Microstructural and Mechanical Characterization of Electrodeposited Gold Films
Published: 1/1/2001
Authors: G J Long, David Thomas Read, Joseph David McColskey, K Crago
Abstract: The effects of temperature and duration of thermal treatments on the microstructure and mechanical properties of electrodeposited gold films were evaluated. Specimens were synthesized by electrodeposition of gold on copper foil substrates followed b ...

46. Microwave Detection of Stress Induced Farigue Cracks in Steel and Potential of Crack Opening Determination Using a New Phase Sensitive Approach Based on a Waveguide Magic TEE
Published: 7/1/2000
Authors: N Qaddoumi, E Ranu, R Zoughi, Joseph David McColskey
Abstract: Detection and evaluation of surface cracks in metals is an important facet of nondestructive testing and evaluation (NDT&E). Cracks in bridges, aircraft wings and other metal structures can pose serious danger to the structure and ultimately human l ...

47. Microwave Detection of Stress-Induced Fatigue Cracks in Steel and Potential for Crack Opening Determination
Published: 6/1/2000
Authors: N Qaddoumi, E Ranu, Joseph David McColskey, R Mirshahi, R Zoughi
Abstract: Fatigue crack detection in metals is an important practical issure in many industries. In this paper the results of an investigation, using the dominat mode approach, employing flange-mounted open-ended rectangular waveguides at several microwave fr ...

48. Detectability of Slow Crack Growth in Bridge Seels by Acoustic Emission
Published: 12/1/1998
Authors: Marvin Arnold Hamstad, Joseph David McColskey
Abstract: The detectabillity of slow crack growth of cracks in bridge steels has been studied by use of acoustic emission testing technology. Fatigue crack-growth rates of nominally 1x10^u-4^ mm/cycle (4x10^U-6^ in./cycle) and 1x10^u-3^ mm/cycle (4x10-5 in/c ...

49. High-Temperature, Tensile, Constitutive Data for World Trade Center Steels
Published: Date unknown
Authors: William E Luecke, Stephen W Banovic, Joseph David McColskey
Abstract: This paper reports high-temperature tensile constitutive data for nine steels recovered from the fire and impact floors of the World Trade Center. Microstructurally, the nine steels represent typical structural steels from the 1970s. It reports the ...

50. Microscale Test Technique and Test Results for Aluminum Thin Films
Published: Date unknown
Authors: David Thomas Read, Joseph David McColskey, Yi-Wen Cheng
Abstract: A microscale, skyhook-type tensile-test technique has been developed to extend tensile testing to micrometer-scale specimens. This technique has been used to perform tenisle tests of 1 m by 10 m by 180 m gauge sections of electron-beam-evaporated ...

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