A novel methodology for shear cohesive law identification of bonded reinforcements

Perrella, Michele; Berardi, Valentino Paolo; Cricrı̀, G.

doi:10.1016/j.compositesb.2018.02.027

Cited by 26 publications

(24 citation statements)

References 36 publications

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“…These curves are representative of experimental evaluations of cohesive shear acting at the concrete-GFRP interface in a form coherent with a Cohesive Zone (CZM) approach and with recent literature results [21][22][23][24][25][26][27][28][29][30][31][32]. The value of the observed debonding force falls within the range of experimental outcomes obtained by the authors through a previous testing system on similar specimens made of the same GFRP lamina and epoxy resin [18]. Moreover, further experimental tests were carried out in order to validate the proposed testing system.…”

Section: Resultssupporting

confidence: 83%

“…Within this context, some specific aspects of this technique have yet to be studied in deeper detail. With reference to FRP-concrete end debonding, it is well-known that the corresponding mechanical behavior can be modeled via a cohesive law, that allows also the prediction of the mode II fracture mechanism experimentally observed in failure of strengthened systems [16][17][18][19][20]. Several researchers are being studied this local failure mechanism by proposing different test setups, generally based on either linear variable displacement transducers (LVDTs) or laser meter devices installed on composite plate and located at the beginning of bonded area, as well as on strain gauges, positioned along longitudinal direction [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Cohesive fracture in composite systems: experimental setup and first results

Berardi¹,

Perrella²,

Cricrı̀³

2019

Frattura Ed Integrità Strutturale

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Composite systems are widely used in many engineering applications for new structures and strengthening of existing ones. Within the structural rehabilitation of civil constructions, the plating technique of beams with Fiber Reinforced Polymer (FRP) represents a quick and optimal intervention with respect to traditional ones. The failure of these composite systems usually occurs due to the FRP debonding, which corresponds to a mode II fracture of concrete specimens. In this paper, a new experimental setup for investigating the mode II fracture behavior of FRP-concrete composite structures is presented. The test equipment consists of both conventional equipment and a non-contact optical technique, Digital Image Correlation (DIC), and the test system was realized at the Design Machine Laboratory of the University of Salerno. A preliminary test was performed and the corresponding results are shown and discussed.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Cohesive fracture in composite systems: experimental setup and first results

Berardi¹,

Perrella²,

Cricrı̀³

2019

Frattura Ed Integrità Strutturale

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“…For example, a consumer digital camera was used in [24] for full-field measurement of deformation within the thin epoxy bond lines in single lap joints with thick aluminum adherends. Researchers have shown that high-resolution DIC measurement of crack tip separation in bonded joints can be used for direct characterization of the cohesive laws in thin adhesive layers [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Interlaminar Tensile Strength and Elastic Properties of Composites Using Open-Hole Compression Testing and Digital Image Correlation

et al. 2019

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Advanced polymeric composites are increasingly used in high-performance aircraft structures to reduce weight and improve efficiency. However, a major challenge delaying the implementation of the advanced composites is the lack of accurate methods for material characterization. Accurate measurement of three-dimensional mechanical properties of composites, stress–strain response, strength, fatigue, and toughness properties, is essential in the development of validated analysis techniques accelerating design and certification of composite structures. In particular, accurate measurement of the through-thickness constitutive properties and interlaminar tensile (ILT) strength is needed to capture delamination failure, which is one of the primary failure modes in composite aircraft structures. A major technical challenge to accurate measurement of ILT properties is their strong sensitivity to manufacturing defects that often leads to unacceptable scatter in standard test results. Unacceptable failure mode in standard test methods is another common obstacle to accurate ILT strength measurement. Characterization methods based on non-contact full-field measurement of deformation have emerged as attractive alternative techniques allowing more flexibility in test configuration to address some of the limitations inherent to strain gauge-based standard testing. In this work, a method based on full-field digital image correlation (DIC) measurement of surface deformation in unidirectional open-hole compression (OHC) specimens is proposed and investigated as a viable alternative to assessing ILT stress–strain, strength, and fatigue properties. Inverse identification using a finite element model updating (FEMU) method is used for simultaneous measurement of through-thickness elastic constants with recovery of the maximum ILT stress at failure for characterization of strength and fatigue S–N curves.

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“…Using the virtual crack-closure technique, the energy release rate of each node at the front edge of the crack under different loads can be obtained. The equivalent stress intensity factor at the front edge of the joint plane can be obtained after altering (2) and (5). The distribution curve of the stress intensity factor along the thickness direction under different loads (see shows that as the angle between the transverse joints and the twisted joints gradually increases, the equivalent stress intensity factor along the front edge of the joint gradually decreases.…”

Section: ( ) Results Analysis ( ) Variation Patterns Of Joint Plane Smentioning

confidence: 99%

“…This approach cannot effectively reflect the spatial effect of the noncoplanar induced joint cracking problem. Strictly speaking, induced joint cracking is a three-dimensional fracturing problem; many scholars have made many research achievements in this field [4][5][6][7][8]. Therefore, a three-dimensional approach is necessary in order to analyze the stress on the induced joints of various spatial formations and to study the cracking effect of various joint plane formations of induced joints.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of the Cracking Effect of Induced Joints of Various Spatial Formations

Yang

2019

Mathematical Problems in Engineering

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The use of induced joints is a common cracking control measure used in the design of roller compacted concrete arch dams. Currently, in some projects in which radial twisted joints were used, during the construction period, some cracks appeared around the induced joints while the joints themselves failed to open. From the fracture mechanics point of view, this problem is related to the variations in the spatial formation of the induced joint planes. In this study, we formulated numerical examples involving square plate and cylindrical arch dam with joints of various planar spatial formations and used the virtual crack-closure technique and the Richard brittle fracture criterion to obtain the equivalent stress intensity factor of the joint plane, and we studied the joint plane stress intensity factor based on the variations in the joint plane formation angle. Based on the reciprocal of the normalized stress intensity factor, we obtained the equivalent strength correction coefficient for induced joints of varying plane angles, referred to in this study as the joint plane formation factor ψα, in order to reflect the influence of varying joint plane formations on the induced joint cracking. Our study results show that as the joint plane angle continuously increases, it is more difficult for the induced joints to open, which implies a gradual increase in the equivalent strength of the joint plane. Therefore, in the actual design of rolled concrete arch dams, the straight transverse joint layout should be used for induced joints. If the use of the radial twisted joint layout is necessary, the joint plane angle should not exceed 10°.

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A novel methodology for shear cohesive law identification of bonded reinforcements

Cited by 26 publications

References 36 publications

Cohesive fracture in composite systems: experimental setup and first results

Cohesive fracture in composite systems: experimental setup and first results

Measurement of Interlaminar Tensile Strength and Elastic Properties of Composites Using Open-Hole Compression Testing and Digital Image Correlation

A Comparative Study of the Cracking Effect of Induced Joints of Various Spatial Formations

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