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MICROMECHANICS-BASED STUDY ON FATIGUE FAILURE OF ENGINEERED CEMENTITIOUS COMPOSITES



Author(s): J. Qiu and E.-H. Yang
Book Title: Seventh International RILEM Conference on High Performance Fiber Reinforced Cement Composites (HPFRCC7)
Editor: H.W. Reinhardt, G.J. Parra-Montesinos, H. Garrecht
ISBN: 978-2-35158-145-2
e-ISBN: 978-2-35158-146-9
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 309-316
Total Pages: 8
Language: English


Abstract: The material design of engineered cementitious composites (ECC), a special group of high-performance fiber-reinforced cementitious composites (HPFRCC), is fundamentally based on micromechanics and can achieve ultra-high tensile strain capacity (3 % or higher). However, the strain capacity is largely reduced after ECC experiencing fatigue loads, due to reduced crack number. Such fatigue-induced immature failure indicates cyclic loads have deteriorated the fiber-bridging behavior in ECC, the underlying mechanism of which is rarely studied. Current research focuses on the fundamental mechanism of fatigue failure of ECC. Specifically, properties of fiber, matrix and fiber-matrix interface under cyclic loads were studied on micro-scale using single-fiber pull-out test; the experimental results were used to characterize the fatigue-dependent parameters in the existing micromechanics-based model for ECC design. Current research indicates that the immature failure of ECC can be attributed to fatigue-induced in-situ fiber strength reduction and slip-hardening of interface.


Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00