Loading and fracture response of CFRP-to-steel adhesively bonded joints with thick adherents – Part II: Numerical simulation

Anyfantis, Konstantinos N.; Tsouvalis, Nicholas G.

doi:10.1016/j.compstruct.2012.08.056

Cited by 36 publications

(9 citation statements)

References 31 publications

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“…In-depth and extensive studies have been conducted on the factors influencing the properties of adhesively bonded structures of composite materials, such as thickness of the adhesive layer [8], gaps in the adhesive layers [9], temperature [10][11][12], and loading forms [13,14], and even reports on nanoscales have been produced [15,16]. The methods used have included experimental tests [17][18][19], finite element simulations [20,21], and analytical methods [22]. However, most objects employed in the research have been limited to the connection structures of resin-based fiber reinforced composite materials at temperatures below 400 • C [12].…”

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confidence: 99%

Compression Shear Properties of Adhesively Bonded Single-Lap Joints of C/C Composite Materials at High Temperatures

2019

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The performance of joint structure is an important aspect of composite material design. In this study, we examined the compression shear bearing capacity of the adhesively bonded single-lap joint structure of high-temperature-resistant composite materials (C/C composite materials). The test pieces were produced in accordance with the appropriate ASTM C1292 standard, which were used for the compression shear test. The failure morphology of the layer was observed by a digital microscopic system and scanning electron microscope. The experimental result shows that the load on the test piece increased nonlinearly until the failure occurred, and most of the adhesive layer exhibited cohesive failures at three temperature points (400, 600, and 800 • C), while the interface failures occurred in a small part of the adhesive layer. A numerical analysis model was established using ABAQUS finite element software. The simulation results were compared with the test results to verify the correctness of the model. On the basis of correctness of the model verified by comparing the simulation results and the test results, the influences of temperature and overlapped length on the joint compression shear performance were studied through the validated simulation method. Numerical results showed that the ultimate load of the joint decreased with increases in temperature and that the distribution trends of the shear stresses in the overlapped length direction were substantially the same for joints of different overlapped lengths.Adhesively bonded joints nonetheless have some disadvantages due to their processing and associated overlapping. The bearing capacity of adhesively bonded joints is considerably affected by the manufacturing process, application environment, geometric dimensions, and the gap between adhesive layers. In particular, for bonded composite structures used in extreme environments such as high temperature and high humidity, joint strength presents an obvious dispersion. The strength of the adhesive changes with the temperature, resulting in changes in the bearing capacity of the joint. Although an adhesive layer has a strong shear capacity, its peeling resistance is poor. A reasonable structure should be designed based on the direction of the maximum load so that the joint can transfer the load as much as possible in the form of shearing. For example, in an adhesively bonded single-lap structure, the peeling stress at both ends of the adhesive layer increases due to secondary bending [6], resulting in failure of the adhesive layer. To reduce the torque generated by an eccentric load, the thin plate is usually selected as the adherend of an adhesively bonded single-lap structure. However, for materials with high brittleness such as C/C composite materials and C/SiC materials, the composite material undergoes brittle fracture if the adhesive strength is large when a thin plate is used for the single-lap joint. Therefore, in practical applications, a scarf joint [7] is used, or alternately the single-lap structure of bri...

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Compression Shear Properties of Adhesively Bonded Single-Lap Joints of C/C Composite Materials at High Temperatures

2019

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“…The number of degrees of freedom is reduced appreciably by this approach because the adherends and the adhesive use the same node. Anyfantis and Tsouvalis's work [13] was focused on the numerical simulation of single-lap bonded joints, based on cohesive zone modelling techniques. The models were built in a 3D FE space.…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies on Mechanical Behavior of Adhesive Joints

Zhang

2015

Advances in Materials Science and Engineering

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This paper describes some finite element models for analyzing the mechanical behavior of adhesive joints. In these models five layers of solid elements were used across the adhesive layer in order to increase the accuracy of the results. The finite elements were refined gradually in steps from adherends to adhesive layer. In these models, most of the adherends and adhesive were modeled using solid brick elements but some solid triangular prism elements were used for a smooth transition. In some of the models, linear interpolation elements of full or reduced integration and of hybrid formulation were used. In other models, quadratic interpolation elements of full or reduced integration and of hybrid formulation were used. Comparisons are drawn between models with different modeling approaches as well as different types of element combinations in order to find a suitable model to predict the behavior of adhesive joints.

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“…Two CFRP sheets were adhesively bonded by Casas-Rodriguez et al [6] and the impact-fatigue performance investigated. Anyfantis and Tsouvalis [7] fabricated joints of CFRP and mild steels by adhesive bonding. They found that an increase (200 %) of overlap length resulted in an increase (100 %) to the joints' lap shear strength.…”

Section: Introductionmentioning

confidence: 99%

Friction stir blind riveting of carbon fiber-reinforced polymer composite and aluminum alloy sheets

Min

et al. 2014

Int J Adv Manuf Technol

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A friction stir blind riveting (FSBR) process is used to fabricate joints of carbon fiber-reinforced polymer composite (CFRP) and aluminum alloy AA6111 sheets in a lap shear configuration. Given the 9,000 rpm spindle speed upper limit of conventional computer numerically controlled machines, the maximum feed rate for FSBR joining CFRP to itself is found to be 120 mm min −1 above which quality issues such as cracking of the CFRP sheet predominate. However, the maximum feed rate during dissimilar joining of CFRP to AA6111 can be 420 mm min −1 when the CFRP top sheet is supported by the AA6111 bottom sheet. The maximum lap shear tensile load of the joints shows little dependence on the spindle speed and feed rate during FSBR. The different stack-up sequences of the CFRP and AA6111 lead to different maximum loads, displacements to fracture, and locations of fracture initiation, i.e., in the CFRP vs. in the AA6111.

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Loading and fracture response of CFRP-to-steel adhesively bonded joints with thick adherents – Part II: Numerical simulation

Cited by 36 publications

References 31 publications

Compression Shear Properties of Adhesively Bonded Single-Lap Joints of C/C Composite Materials at High Temperatures

Compression Shear Properties of Adhesively Bonded Single-Lap Joints of C/C Composite Materials at High Temperatures

Numerical Studies on Mechanical Behavior of Adhesive Joints

Friction stir blind riveting of carbon fiber-reinforced polymer composite and aluminum alloy sheets

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