Novel pre-clamp lap joint for CFRP plates: Design and experimental study

Ding, Guozhen; Feng, Peng; Wang, Yu; Ai, Pengcheng

doi:10.1016/j.compstruct.2022.116240

Cited by 19 publications

(4 citation statements)

References 25 publications

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“…The formation of the USW joints is determined by the development of both frictional heating and penetration (mass transfer) processes at the interface of the components being welded [27]. However, the small (and somehow variable) thicknesses of the prepregs, combined with the high thermal conductivity of the CF-fabric, caused melting of the PEI binder in them and was accompanied by its partial extrusion under the action of clamping pressure during the USW procedures.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic welding of lap joints of PEI plates with PEI/CF-fabric prepregs

Alexenko,

Tian,

Panin

et al. 2024

Frattura Ed Integrità Strutturale

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In this study, ultrasonic welding (USW) of lap joints of polyetherimide (PEI) plates (adherends) with carbon fiber (CF) prepregs impregnated with PEI was investigated. No energy director (ED) was used, so binder contents were varied in the prepregs to compensate for the lack of the polymer in the fusion zone. In addition, the effect of the USW parameters on the structure and the mechanical properties of the lap-joints were analyzed. The most homogeneous macrostructure, the maintained structural integrity of both the CF-fabric in the prepregs and the lap-joined PEI adherends, as well as the maximum strength properties (tensile strength) were revealed for the USW joints with the minimum polymer content in the prepreg. In this case, rising the USW time from 400 up to 800 ms radically changed the macrostructure of the fusion zone, while the strength properties did not vary significantly (shear stresses were 42–48 MPa). Computer simulation of the influence of the PEI/CF-fabric ratios in the prepregs on the deformation response of the USW joints showed that the prepreg thicknesses and, accordingly, the PEI/CF ratios did not exert a noticeable effect on the strain–stress (tensile) diagrams, while the determining factor was the adhesion level.

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Section: Resultsmentioning

confidence: 99%

Ultrasonic welding of lap joints of PEI plates with PEI/CF-fabric prepregs

Alexenko,

Tian,

Panin

et al. 2024

Frattura Ed Integrità Strutturale

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“…The current study focuses on the optimization of USW procedures for lap joints of PEI-based components, assuming that they are characterized by an identical melting temperature. In [33], it was recommended to insert low-melting EDs to maintain the structural integrity of the adherends. For this reason, a commercially available film (the TecaPEI-polyetherimide copolymer) was tested.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Energy Director Material on the Structure and Properties of Ultrasonic Welded Lap Joints of PEI Plates with CF Fabric/PEI Prepreg

Tian,

Alexenko,

Panin

et al. 2024

J. Compos. Sci.

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To estimate the possibility of using both low-melting TecaPEI and neat PEI films as energy directors (EDs) for ultrasonic welding (USW) of carbon fiber (CF) fabric–polyetherimide (PEI) laminates, some patterns of structure formation and mechanical properties of their lap joints were investigated by varying the process parameters. The experiment was planned by the Taguchi method with the L9 orthogonal matrix. Based on the obtained results, USW parameters were optimized accounting for maintaining the structural integrity of the joined components and improving their functional characteristics. The use of the low-melting EDTecaPEI film enabled US-welding the laminates with minimal damage to the fusion zone, and the achieved lap shear strength (LSS) values of ~7.6 MPa were low. The use of EDSolverPEI excluded thermal degradation of the components as well as damage to the fusion zone, and improved LSS values to 21 MPa. With the use of digital image correlation (DIC) and computed tomography (CT) techniques, the structural factors affecting the deformation behavior of the USW lap joints were justified. A scheme was proposed that established the relationship between structural factors and the deformation response of the USW lap joints under static tension. The TecaPEI film can be used in USW procedures when very high interlayer adhesion properties are not on demand.

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“…AE and digital image correlation techniques are analyzed simultaneously, and the combination of these two techniques makes it possible to identify the various phases of the global behavior and the chronology of damage in bolted joint assemblies. Ding et al 17 used an AE technique to monitor the failure behavior of a novel carbon‐fiber reinforced plastics lap joint nondestructively. The results show that abundant AE activities begin to appear when the longitudinal cracking occurs and when the fiber breakage starts, and finally, there still exists a small number of AE hits detected with relatively low absolute energy during the “friction plateau” stage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of friction‐related acoustic emission in bolted joint structures

Sun,

Yang,

et al. 2023

Int Journal of Mech Sys Dyn

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A bolted joint may be in a state of continuous fretting friction and wear under random oscillatory loading, which makes the bolted joint prone to loosening. Therefore, it is essential to find a way to monitor the contact state of a bolted joint on time and handle it adeptly. Acoustic emission (AE) signals will be generated during the reciprocating friction of the bolted joint interface. Exploring the relationship between the frictional slip features and the acoustic emission characteristics under different bolt preloads can lay the foundation for using the acoustic emission techniques to monitor the pretightening state of bolted joints. This paper experimentally investigates the acoustic emission signals of a bolted joint structure during friction under different preloads, three repeated tests are implemented. The relationship between friction behavior and acoustic emission characteristics under different preloads is studied. The evolution of classical acoustic emission parameters and kinematic parameters with bolt preload levels is also analyzed. The 3‐D topography of the specimens after parametric tests is analyzed. The results show that the characteristics of both burst‐type and continuous‐type acoustic emission can reflect different friction behavior under different bolt preloads. The evolution curves of acoustic emission parameters changed under the interaction of both frictional kinematic parameters and bolt preload levels. For the 3‐D surface topography, the reciprocating friction shears the peaks and fills the surface valleys, and the topography of the scratched surface areas is redistributed.

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Novel pre-clamp lap joint for CFRP plates: Design and experimental study

Cited by 19 publications

References 25 publications

Ultrasonic welding of lap joints of PEI plates with PEI/CF-fabric prepregs

Ultrasonic welding of lap joints of PEI plates with PEI/CF-fabric prepregs

Effect of the Energy Director Material on the Structure and Properties of Ultrasonic Welded Lap Joints of PEI Plates with CF Fabric/PEI Prepreg

Analysis of friction‐related acoustic emission in bolted joint structures

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