Coalescence of Fractures Under Uni-axial Compression and Fatigue Loading |
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| Authors: | Y L Chen J Ni W Shao Y C Zhou A Javadi R Azzam |
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| Institution: | (1) Department of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, 200093, People’s Republic of China;(2) Department of Engineering, University of Exeter, North Park Road, Exeter, EX4 4QF, UK;(3) Department of Engineering Geology and Hydrogeology, RWTH Aachen University, Lochnerstr. 4-20, 52064 Aachen, Germany |
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| Abstract: | In this paper, white Portland cement was used as an experimental material. Prismatic specimens with pre-existing flaws at
different angles of inclination (α) varying through 0°, 30°, 45°, 60°, 75° to 90° and cylindrical specimens with different numbers of pre-existing flaws (n) varying through 0, 1, 2 to 3 were tested under uni-axial compression tests. Crack initiation, propagation, coalescence,
and failure were observed. The corresponding analytical expression for the stress intensity factor under uni-axial compression
was derived, the coefficient of friction and the stress intensity factor of the specimens on the surfaces of the crack were
analysed, and the corrective coefficient for the stress intensity factor was introduced. Fatigue tests with a loading frequency
of f = 100 Hz were carried out on cylindrical specimens with constant amplitude of the cyclic load which is a proportion of the
compressive load at failure (F
f) obtained from the uni-axial compression tests. The fatigue property of the specimens was analysed and the relationship (S
max − lg N
f) between the maximum stress and the number of loading cycles at failure for specimens with pre-existing flaws was proposed.
The effect of pre-existing flaws on the fatigue life (N
f) and dynamic load (S
D) which can be applied was investigated. |
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