Fatigue Crack Propagation in Plain Concrete Beams by Acoustic Emission Technique

Abstract

Abstract. Fatigue crack growth in plain concrete specimens subjected to constant amplitude cyclic loading is studied. Acoustic Emission (AE) technique has been used to monitor the fatigue crack propagation. Three different sizes of geometrically similar beam specimens are prepared and are tested under three point bending (TPB) in a closed loop servo-controlled testing machine. The data such as load, displacement and CMOD from the testing of specimen for fatigue are acquired in a data acquisition systems and crack growth is continuously monitored using six AE sensors mounted on the specimen. The CMOD compliances at different cycles are measured from the load-CMOD curves and the equivalent fatigue crack lengths are determined using the compliance calibration curve obtained from FE analysis. AE parameters such as events, counts and absolute energy are used to analyze the crack growth.

Fatigue of notched steel hollow sections under sinusoidal cyclic loading

“…where A = amplitude ratio, F min = the minimum force, and F max = the maximum force. According to Prashanth et al [21], F min = 10%F max and F max = 90%F ult can be considered at A = 0.10. F ult is the ultimate force that must be measured in a static test.…”