Abstract
Three-point bending (TPB) fatigue fracture tests were conducted on Engineered Cementitious Composites (ECC) prefabricated notched beam specimens at three target temperatures (T = 20℃, 100℃, 200℃) and three stress levels (S = 0.7,0.8,0.9). The fatigue life, maximum crack opening displacement (CMODmax), and stiffness attenuation were characterized. The evolution of cracks is recorded in real time. The fatigue crack growth curve (af-N) is obtained by fitting a logistic function, and the crack growth rate is determined based on its first derivative. It is found that compared to 20℃, there is a slight increase in the fatigue life of ECC, and the critical crack growth rate decreases after 100℃. After 200℃, the fatigue life of ECC decreases, the brittleness increases, and the crack growth rate increases. This is mainly related to the degradation of PVA fibers at 200℃, with most fibers being pulled off during fatigue loading, which leads to a decrease in crack propagation resistance.
Published Version
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