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    Strain Gage Tests on Diesel Cylinder Blocks, Heads, and Pistons

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    This paper covers tests made with SR-4 gages on the cylinder block, piston, and cylinder head of a large diesel engine. The object was to determine the approximate magnitude of stress in these parts under operating conditions. The size of the parts and their availability precluded the possibility of making a laboratory set up. The tests were made with the partially assembled engine on the erection floor. The firing load was obtained by means of oil under pressure in the cylinder. A neoprene sealing ring was used as shown in Fig. 1. The wiring of each individual gage consumes time as well as increases the danger of thegage being damaged. A mercury contactor, shown in Fig. 2, was devised to permit a quick balancing of each gage. For gages on a horizontal surface, a 2-in. piece of No. 24 wire soldered to each lead will facilitate the use of the contactor.

    Author Information:

    Newton, C. L.
    Fairbanks, Morse and Co., Beloit, Wis.

    Swannack, J. D.
    Fairbanks, Morse and Co., Beloit, Wis.

    Committee/Subcommittee: A04.21

    DOI: 10.1520/STP48066S