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11 March, 21:43

Required information Two steels are being considered for the manufacture of as-forged connecting rods subjected to bending loads. One is AISI 4340 Cr-Mo-Ni steel capable of being heat-treated to a tensile strength of 260 kpsi. The other is a plain carbon steel AISI 1040 with an attainable Sut of 113 kpsi. Each rod is to have a size giving an equivalent diameter de of 0.32 in. Determine the endurance limit for each material. Is there any advantage of using the alloy steel for this fatigue application

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  1. 12 March, 01:31
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    Answer: Yes, there is advantage.

    Explanation:

    Step 1 of 3

    For AISI 4340 Cr-Mo-Ni steel

    The tensile strength (S) = 260kpsi.

    Step 2

    Endurance limit for (S') for 260kpsi is 100 kpsi

    From table parameters for As-forged surface finish

    a = 39. 9, b=-0. 995

    Step 3

    Find the surface factor by using

    aS^b

    S is tensile strength is 260kpsi.

    Therefore

    Surface factor =

    39, 9 (S) ^-0.995 = 0.1578

    ,
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