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    加黃고무의 彈性率과 스프링式硬度에 關한 硏究 = Studies on the Modulus of Elasticity and Spring Type Hardness of Vulcanized Rubber

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    https://www.riss.kr/link?id=A2067230

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    The relation between the shear modulus of elasticity and the indentation hardness of vulcanized rubber id derived, from the theory of elasticity. Hooke's law, isotropy and incompressibility of rubber are assumed in the derivation. Indentor shape is presumed as a cylinder of average diameter of a truncated cone. An Approximate conclusion is expressed as follow
    ??
    where ?? is indentation hardness degree of rubber, G is shear modulus of rubber and ?? is a constant, (If G=?? then ??=50 and it shows the meaning of the constant ??) The calculated value of ?? for KS A hardness scale is 705 kgf/cm², but the measured value of shear modulus for rubber of hardness degree 50 is sometimes smaller than the calculated ??. The disagreement is caused by the stress relaxation, because the measurement of modulus of elasticity requires longer time than that of indentation hardness. The above expression for Shore A scale agrees fairly well with the IRHD probit curve shown is ISO Recommendation R48.
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    The relation between the shear modulus of elasticity and the indentation hardness of vulcanized rubber id derived, from the theory of elasticity. Hooke's law, isotropy and incompressibility of rubber are assumed in the derivation. Indentor shape is pr...

    The relation between the shear modulus of elasticity and the indentation hardness of vulcanized rubber id derived, from the theory of elasticity. Hooke's law, isotropy and incompressibility of rubber are assumed in the derivation. Indentor shape is presumed as a cylinder of average diameter of a truncated cone. An Approximate conclusion is expressed as follow
    ??
    where ?? is indentation hardness degree of rubber, G is shear modulus of rubber and ?? is a constant, (If G=?? then ??=50 and it shows the meaning of the constant ??) The calculated value of ?? for KS A hardness scale is 705 kgf/cm², but the measured value of shear modulus for rubber of hardness degree 50 is sometimes smaller than the calculated ??. The disagreement is caused by the stress relaxation, because the measurement of modulus of elasticity requires longer time than that of indentation hardness. The above expression for Shore A scale agrees fairly well with the IRHD probit curve shown is ISO Recommendation R48.

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