| Abstrakt: |
By using the Love displacement function, this paper presents a general framework for obtaining stress and strain distributions within an isotropic elastic solid circular cylinder of diameter 2Rand height 2hcompressed between a pair of concentrically circular punches of diameter 2aon the top and bottom end surfaces. The influence of h/R, a/Rand Poisson ratio von the stress and strain distribution of the cylinder under the double punch test was studied. The results demonstrate that, the maximum tensile stress (strain) increases with the decrease of h/Rand a/R, and with the increase of Poisson's ratio v, the maximum tensile stress decreases, while the maximum tensile strain increases. For small Poisson's ratio (less than 0.26), our numerical results show that the estimation by Chen’s 67(2):993–995, (1970) formula appears to underestimate the tensile strength. The tensile strength interpreted from the present analysis is found comparable to the formula proposed by Bortolotti 85(1):26–32 (1988), and thus the new formula provides a more widely application. The inherent relationship between the value of the failure angle and the failure characteristic of the specimen under double punch test has also been established. And combined with the double punch test results of ordinary concrete and steel fiber reinforced concrete, it is concluded that the specimen fails may be due to the tensile stress. |
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