Online ISSN : 1880-6244
Print ISSN : 0916-1740
ISSN-L : 0916-1740
Original Paper
Extension of Constitutive Equation of Variable Compliance Type and its Validation based on Creep Data
Seisuke OKUBOKatsunori FUKUIKimihiro HASHIBA
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2002 Volume 118 Issue 12 Pages 737-744


A constitutive equation of variable compliance type had been proposed by Okubo in 1987. The equation is simple and its parameters are relatively easy to obtain. The equation can be applicable to creep of rock, however, experimental result in primary creep region in which strain rate is decreasing with time does not conform well to the calculated result.
Recently Okubo and Fukui (2002) proposed a constitutive equation especially focusing on low stress level creep. In this study, old one proposed in 1987 and new one proposed in 2002 are combined to extend an applicable range of the constitutive equation of variable compliance type.
For validation of the proposed constitutive equation, calculated results are compared with the experimental data by Okubo and Nishimatsu (1986) and Fukui et al. (1992, 1993), and it can be said that experimental results in uniaxial compression can be well simulated by the proposed equation. The equation is also tested against the creep performed in uniaxial tension and possible applicability of the equation to tensile stress field is discussed.

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© 2002 by The Mining and Materials Processing Institute of Japan
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