The prediction of crack growth in bonded joints under cyclic-fatigue loading I. Experimental studies

AbstractThe mechanisms associated with cycle-by-cycle damage accumulation resulting in fatigue crack propagation between a highly constrained polymer layer and an adjacent elastic substrate are explored. Specifically, cyclic fatigue-induced crack growth between a bisphenol F model epoxy system and a passivated silicon substrate under Mode I loading is reported. Preliminary findings regarding the effects of fatigue load ratio on interfacial crack growth rates are presented. While intermediate crack growth rates were significantly accelerated under cyclic loading, the near-threshold crack growth behavior under cyclic and monotonic loading was surprisingly similar.

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On Bond-slip of EB-FRP/Concrete Interface in Shear Under Fatigue Loading: Review and Synthesis of Experimental Studies and Models

Journal of Civil Engineering and Construction ◽

10.32732/jcec.2022.11.1.1 ◽

2022 ◽

Vol 11 (1) ◽

pp. 1-19

Author(s):

Abbas Fathi ◽

Georges El-Saikaly ◽

Omar Chaallal

Keyword(s):

Structural Damage ◽

Fatigue Behavior ◽

Experimental Studies ◽

Fatigue Loading ◽

Cyclic Fatigue ◽

Design Guidelines ◽

Rc Structures ◽

Bond Slip ◽

Wide Range ◽

Concrete Interface

Reinforced concrete (RC) structures subjected to cyclic fatigue loading are prone to progressive damage. Among the types of structural damage, those leading to shear deficiencies can result in sudden rupture of structures without warning. Hence, RC structures deficient in shear urgently need retrofitting. The use of externally bonded (EB) fiber-reinforced polymer (FRP) composites presents many advantages and is a very promising technology for shear strengthening of RC structures. This paper encompasses a wide range of research findings related to the interaction between concrete and FRP under fatigue loading. The behavior of the bond between FRP and concrete plays a major role in the failure mode of FRP shear-strengthened structures especially under fatigue. Therefore, it is of interest to characterize the FRP/concrete interaction using appropriate models with respect to the influencing parameters. The paper will first discuss existing design guidelines and considerations related to the fatigue behavior of RC structures. A thorough review of available literature on EB-FRP/concrete bond in shear under cyclic fatigue loading will then be presented, with a focus on proposed bond-slip models and finite element studies of the FRP/concrete interface under fatigue loading.

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A closure model for predicting crack growth under creep-fatigue loading

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2019.03.029 ◽

2019 ◽

Vol 125 ◽

pp. 58-71 ◽

Cited By ~ 8

Author(s):

Gabriel P. Potirniche

Keyword(s):

Crack Growth ◽

Fatigue Loading ◽

Closure Model ◽

Creep Fatigue

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Cyclic-fatigue crack growth in composite and adhesively-bonded structures: The FAA slow crack growth approach to certification and the problem of similitude

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2016.03.008 ◽

2016 ◽

Vol 88 ◽

pp. 10-18 ◽

Cited By ~ 48

Author(s):

R. Jones ◽

A.J. Kinloch ◽

W. Hu

Keyword(s):

Fatigue Crack ◽

Fatigue Crack Growth ◽

Crack Growth ◽

Slow Crack Growth ◽

Cyclic Fatigue ◽

Adhesively Bonded ◽

Growth Approach ◽

Adhesively Bonded Structures

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Crack Growth in Stainless Steel 304 under Creep-Fatigue Loading

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.485 ◽

2007 ◽

Vol 353-358 ◽

pp. 485-490 ◽

Cited By ~ 1

Author(s):

Y.M. Baik ◽

K.S. Kim

Keyword(s):

Stress Intensity Factor ◽

Stainless Steel ◽

Stress Intensity ◽

Intensity Factor ◽

Crack Growth ◽

Growth Rates ◽

Static Loading ◽

Fatigue Loading ◽

Creep Fatigue ◽

Crack Growth Rates

Crack growth in compact specimens of type 304 stainless steel is studied at 538oC. Loading conditions include pure fatigue loading, static loading and fatigue loading with hold time. Crack growth rates are correlated with the stress intensity factor. A finite element analysis is performed to understand the crack tip field under creep-fatigue loading. It is found that fatigue loading interrupts stress relaxation around the crack tip and cause stress reinstatement, thereby accelerating crack growth compared with pure static loading. An effort is made to model crack growth rates under combined influence of creep and fatigue loading. The correlation with the stress intensity factor is found better when da/dt is used instead of da/dN. Both the linear summation rule and the dominant damage rule overestimate crack growth rates under creep-fatigue loading. A model is proposed to better correlate crack growth rates under creep-fatigue loading: 1 c f da da da dt dt dt Ψ −Ψ     =         , where Ψ is an exponent determined from damage under pure fatigue loading and pure creep loading. This model correlates crack growth rates for relatively small loads and low stress intensity factors. However, correlation becomes poor as the crack growth rate becomes large under a high level of load.

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