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| EXPERIMENTAL STUDY OF DYNAMIC AXIAL TENSILE MECHANICAL PROPERTIES OF GRANITE |
| (1. College of Civil and Transportation Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Architectural Engineering Institute，Jinling Institute of Technology，Nanjing，Jiangsu 211169，China) |
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Abstract A series of dynamic axial tensile tests of granite are carried out by using MTS testing machine，considering the impact loads with different strain rates，different initial static loads and the variable amplitude triangular loads. The results indicate that：The tensile strength of granite increases linearly with the increase in strain rate ranging from 10－6 s－1 to 10－2 s－1. The elastic modulus of granite has no obvious change with the variation in strain rate. The peak strain has a increasing tendency with the increase in strain rate；and the ultimate strain is not sensitive to the strain rate. The ascending part of the nominal complete stress-strain curve before 40% of tensile strength under different strain rates is of linear；and then it goes into remarkable nonlinear stage，which the degree of linearity decreases with the increase in strain rate. The descending part can be divided into two segments，an inflexion point which strain is 300–400 me appears when the load decreases to 25% of tensile strength，then the deformation becomes aggravate；the strain is about 600–900 me when the residual stress is about 10% of tensile strength. The initial static load less than 50% of tensile strength does not influence the dynamic tensile strength but be beneficial to it；the larger initial static load is harmful to the dynamic strength. The fatigue damage by the cyclic variable amplitude load leads to the descending of strength because of the cumulative damage. Residual strain increases gradually and the increase rate becomes larger and larger with the increase in cycle，which means that damage softening effect appears.
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Received: 12 April 2010
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2010, Vol. 29 
