Experimental analysis of damage propagation in riveted CFRP-steel structures by thermal loads

Wagner, Julia L.; Wilhelm, Maximilian; Baier, H.; Füssel, Uwe; Richter, Thomas

doi:10.1007/s00170-014-6197-5

Cited by 22 publications

(8 citation statements)

References 18 publications

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“…Recently, extensive research has been conducted for joining carbon fiber composites to various metals (e.g., aluminum or magnesium alloys), using laser welding [7,8], friction stir blind riveting [9], friction spot joining [10][11][12], ultrasonic welding [13], adhesive bonding [14], friction lap welding [15,16], friction-based injection clinching joining [17], self-piercing riveting [18,19], and hybrid bonding (adhesive + mechanical fastening) [20][21][22]. In addition, very limited work has been focused on joining carbon fiber composites to steel [8,14,23,24]. However, the hole clinching and self-piercing rivet processes have been shown to be difficult to apply to AHSSs (σ TS > 780 MPa) [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Materials Joining of Carbon Fiber Polymer to Dual Phase 980 by Friction Bit Joining, Adhesive Bonding, and Weldbonding

Lim

Park

Jang

et al. 2018

Metals

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In the present work, joining of a carbon fiber-reinforced polymer and dual phase 980 steel was studied using the friction bit joining, adhesive bonding, and weldbonding processes. The friction bit joining process was optimized for the maximum joint strength by varying the process parameters. Then, the adhesive bonding and weld bonding (friction bit joining plus adhesive bonding) processes were further developed. Lap shear tensile and cross-tension testing were used to assess the joint integrity of each process. Fractured specimens were compared for the individual processes. The microstructures in the joining bit ranged from tempered martensite to fully martensite in the cross-section view of friction bit-joined specimens. Additionally, the thermal decomposition temperature of the as-received carbon fiber composite was studied by thermogravimetric analysis. Fourier-transform infrared–attenuated total reflectance spectroscopy and X-ray diffraction measurements showed minimal variations in the absorption peak and diffraction peak patterns, indicating insignificant thermal degradation of the carbon fiber matrix due to friction bit joining.

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Section: Introductionmentioning

confidence: 99%

Dissimilar Materials Joining of Carbon Fiber Polymer to Dual Phase 980 by Friction Bit Joining, Adhesive Bonding, and Weldbonding

Lim

Park

Jang

et al. 2018

Metals

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“…In addition to mechanical loads also thermal loads influence the strength of SPR joints. Their effect on the damage propagation in carbon/glass fibre hybrid thermosets was investigated by Wagner et al (2014) where thermal loads are found to cause a reduction of the joint strength.…”

Section: Introductionmentioning

confidence: 99%

Simulation of self-piercing rivetting processes in fibre reinforced polymers: Material modelling and parameter identification

Hirsch

Müller

Machens

et al. 2017

Journal of Materials Processing Technology

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This paper addresses the numerical simulation of self-piercing rivetting processes to join fibre reinforced polymers and sheet metals. Special emphasis is placed on the modelling of the deformation and failure behaviour of the composite material. Different from the simulation of rivetting processes in metals, which requires the modelling of large plastic deformations, the mechanical response of composites is typically governed by intra-and interlaminar damage phenomena. Depending on the polymeric matrix, viscoelastic effects can interfere particularly with the long-term behaviour of the joint. We propose a systematic approach to the modelling of composite laminates, discuss limitations of the used model, and present details of parameter identification.Homogenisation techniques are applied to predict the mechanical behaviour of the composite in terms of effective anisotropic elastic and viscoelastic material properties. In combination with a continuum damage approach this model represents the deformation and failure behaviour of individual laminae. Cohesive zone elements enable the modelling of delamination processes. The parameters of the latter models are identified from experiments. The defined material model for the composite is eventually utilised in the simulation of an exemplary self-piercing rivetting process.

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“…The characteristics of damage due to the applied load with different coefficients of thermal expansion have been investigated around rivets in multiple joints in CFRP-steel structures. 7 The dynamic tensile response and the failure of CFRP riveted joints were investigated experimentally. The variation of the tensile strength with the loading rate was negligible, while the mean total energy absorption of the CFRP composite joint increased with an increase in the loading rate.…”

Section: Introductionmentioning

confidence: 99%

Effects of machined circular holes on the mechanical properties of unidirectional carbon fiber-reinforced plastics

Okayasu

Naito

Fukuyama

et al. 2017

Journal of Composite Materials

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The effects of machined circular holes on the mechanical properties and failure characteristics of a unidirectional CFRP were investigated. Our approach was to change the location and the number of holes: (i) a two-set hole was machined with different modes: (A) parallel, (B) 45°and (C) a direction perpendicular to the loading direction; and (ii) multiple holes from n = 0 to 5 were made in the sample parallel to the loading direction. The higher tensile and higher fatigue strengths were obtained for the CFRP sample produced by mode A, compared to modes B and C. This was attributed to the different extend of the maximum stress and stress distribution, caused by the geometrical effects on the sample. The ultimate tensile strength (σUTS) of the sample was well predicted by the geometrical criterion. If the number of holes was increased from n = 0 to n = 2, the tensile strength decreased dramatically. However, the tensile strength did not strongly decrease further for samples with multiple holes from n = 2 to 5. The tensile strength is correlated with the maximum stress adjacent to the hole(s). Those stress values were verified by a 2D digital image correlation and a finite element analysis. Material failure of the CFRP during tensile loading was revealed by nondestructive testing using a piezoelectric ceramic, and debonding of the fibers occurred even at a low applied stress of approximately 35% σUTS.

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Experimental analysis of damage propagation in riveted CFRP-steel structures by thermal loads

Cited by 22 publications

References 18 publications

Dissimilar Materials Joining of Carbon Fiber Polymer to Dual Phase 980 by Friction Bit Joining, Adhesive Bonding, and Weldbonding

Dissimilar Materials Joining of Carbon Fiber Polymer to Dual Phase 980 by Friction Bit Joining, Adhesive Bonding, and Weldbonding

Simulation of self-piercing rivetting processes in fibre reinforced polymers: Material modelling and parameter identification

Effects of machined circular holes on the mechanical properties of unidirectional carbon fiber-reinforced plastics

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