File:MetalFatigue 001.jpg

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The two newly-developed automatic stopping devices installed on a fatigue-testing machine at the National Bureau of Standards. (Note: the motor in the foreground is not part of the set-up.) The metal specimen under test is held in place between the two bearing boxes (right). The bearing boxes are supported at the ends away from the specimen and weighted at the ends near the specimen, so that the weighted ends tend to sag more when a crack begins to form in the specimen. If the crack is on only one side of the specimen, vibration as well as sagging will result. The deflection-responsive stopping device consists of the microswitch (center) actuated by the lever rigidly fastened to the right-hand bearing box. The vibration-responsive device (just behind and to the right of the specimen) consists of a steel ball poised on a pedestal; when vibration shakes the ball from the pedestal, it closes a circuit. Both devices are used simultaneously at NBS with their circuits in parallel; either may be actuated first, depending on the nature of the incipient crack.

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National Institute of Standards and Technology

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National Institute of Standards and Technology

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

English ∙ 日本語 ∙ македонски ∙ Nederlands ∙ +/−

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:02, 6 March 2014		5,813 × 4,734 (1.13 MB)	NISTResearchLibrary (talk \| contribs)

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Image title	The two newly-developed automatic stopping devices installed on a fatigue-testing machine at the National Bureau of Standards. (Note: the motor in the foreground is not part of the set-up.) The metal specimen under test is held in place between the two bearing boxes (right). The bearing boxes are supported at the ends away from the specimen and weighted at the ends near the specimen, so that the weighted ends tend to sag more when a crack begins to form in the specimen. If the crack is on only one side of the specimen, vibration as well as sagging will result. The deflection-responsive stopping device consists of the microswitch (center) actuated by the lever rigidly fastened to the right-hand bearing box. The vibration-responsive device (just behind and to the right of the specimen) consists of a steel ball poised on a pedestal; when vibration shakes the ball from the pedestal, it closes a circuit. Both devices are used simultaneously at NBS with their circuits in parallel; either may be actuated first, depending on the nature of the incipient crack.
Author	National Institute of Standards and Technology
Copyright holder	The images in the Metal Fatigue Photographic Collection are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder. Use of the images from NIST Digital Collections is not restricted, but a statement of attribution is required. Please use the following attribution statement: "National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899."
Source	Metal Fatigue Photographic Collection
Headline	National Institute of Standards and Technology
Short title	Automatic stopping devices on a fatigue-testing machine
Width	5,813 px
Height	4,734 px
Bits per component	16 16 16
Compression scheme	Uncompressed
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	600 dpi
Vertical resolution	600 dpi
Data arrangement	chunky format
Software used	Adobe Photoshop CS5 Windows
File change date and time	16:03, 12 February 2013
Exif version	2.21
Color space	Uncalibrated
Image width	5,813 px
Image height	4,734 px
Original transmission location code	510075
Date metadata was last modified	11:21, 12 February 2013
Date and time of digitizing	02:38, 29 January 2013
Copyright status	Copyright status not set
Unique ID of original document	xmp.did:933A136B5675E21197A3CF50644ABE3E
Keywords	Metals--Fatigue--Photograph collections.
Contact information	library@nist.gov 100 Bureau Dr, MS 2500 Gaithersburg, MD, 20899 301-975-3052
IIM version	2

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