The calibration of brittle lacquer is an important part of the technique. The photograph, FIG. 10, gives some idea of the essentials of a cam operated cantilever beam bending rig with a steel beam in position, partially deflected; the equipment shown is in certain respects similar to an American apparatus the subject of U.S. Patent No. 2,310,845. FIG. 11 shows the typical formation of a crack pattern in an early type of cantilever calibration beam the dimensions of which are given in FIG. 12. The cracks observed may be grouped into two classes, the first incomplete cracks at A, distance L1 from the root, and the first complete crack at C, distance L2 from the root of the beam. Consistent results have been obtained using the mean position at B, corresponding to ×=1/2(L1 + L2) in. to compute the strain sensitivities of lacquers. The distance A to C, equivalent to (L1−L2.) in. is invariably quite constant for a given type of lacquer, and thickness of coaling, a typical relationship between dimension (L1−L2) in. and the thickness of a lacquer is illustrated by FIG. 13.


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    Titel :

    Some Developments and Applications of Brittle Lacquers


    Untertitel :

    A Survey of Published Work and Some Original Contributions


    Beteiligte:
    Linge, J.R. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.05.1958


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Some Developments and Applications of Brittle Lacquers

    Linge, J.R. | Emerald Group Publishing | 1958


    Some Developments and Applications of Brittle Lacquers

    Linge, J.R. | Emerald Group Publishing | 1958


    Brittle lacquers as aid to stress analysis

    de Forest, A.V. / Ellis, G. | Engineering Index Backfile | 1940


    Recent developments in manufacture of lacquers and varnishes

    Bottier, M. | Engineering Index Backfile | 1927


    Airplane dopes and lacquers and their application

    McCutcheon, W.W. | Engineering Index Backfile | 1930