Volume 6, Issue 3 (May 1978)

    Mechanical Properties in Bending at Elevated Temperature of High Strength Copper Alloy Flat Spring Materials

    CODEN: JTEOAD

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    Abstract

    The yield strength and modulus of elasticity in bending for several high strength copper alloy flat spring materials were determined in the temperature range 23 to 232°C (73 to 450°F) by both static and dynamic measurements. Results obtained by both methods are compared with those obtained by using a simple, short-time stress-relaxation test, and their applicability to the design of flat springs or connectors is discussed. The short-time stress-relaxation test is proposed as a simple acceptance test for flat spring materials. The alloys studied include one copper-nickel-tin alloy strengthened by spinodal decomposition (92% copper-4% nickel-4% tin), copper beryllium alloy (CA 172), copper cadmium alloy (CA 162), and copperiron-phosphorus alloy (CA 196). Long-time stress-relaxation data (2000 h) for the temperature range 23 to 232°C (73 to 450°F) confirm the observations made during the short-time relaxation tests, which showed that for extended service life applications springs made from either precipitation heat-treated CA 172 or appropriately aged 9244 alloy would operate satisfactorily at temperatures below 121°C (250°F) while those made from either of the other two alloys would not. Similar conclusions could not be drawn on the basis of bending yield strength.


    Author Information:

    Fox, A
    Members of the technical staffmember of ASTM, Bell Laboratories, Murray Hill, N.J.

    Fuchs, EO
    Members of the technical staffmember of ASTM, Bell Laboratories, Murray Hill, N.J.


    Stock #: JTE10944J

    ISSN: 0090-3973

    DOI: 10.1520/JTE10944J

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    Author
    Title Mechanical Properties in Bending at Elevated Temperature of High Strength Copper Alloy Flat Spring Materials
    Symposium , 0000-00-00
    Committee B05