Issue 48

S. Bhowmik et alii, Frattura ed Integrità Strutturale, 48 (2019) 419-428; DOI: 10.3221/IGF-ESIS.48.40 427 the horizontal displacement is negligible. Critical effective crack length has been obtained for medium size beam specimens under static and fatigue loading cases. Further, an increase in critical energy dissipation has been observed with the increase of the size of the specimen indicating the exhibition of size effect. Figure 12: Variation of vertical displacement with different percentage of post peak load. Figure 13: Variation of vertical displacement with number of load cycles. A CKNOWLEDGEMENT he financial grant provided by Department of Science and Technology, New Delhi, India for the execution of the work is greatfully acknowledged. R EFERENCES [1] Bhowmik, S. and Ray, S., (2018). An improved crack propagation model for plain concrete under fatigue loading. Engineering Fracture Mechanics, 191, pp.365-382. DOI:10.1016/j.engfracmech.2018.01.003. [2] Mihashi, H., Nomura, N. and Niiseki, S., (1991). Influence of aggregate size on fracture process zone of concrete detected with three dimensional acoustic emission technique. Cement and Concrete Research, 21(5), pp.737-744. DOI: 10.1016/0008-8846(91)90168-H. T