Analysis of the mechanical performance of hybrid (SPR/bonded) single-lap joints between CFRP panels and aluminum blanks

Franco, Giuseppe Di; Fratini, Livan; Pasta, Antonino

doi:10.1016/j.ijadhadh.2012.10.008

Cited by 125 publications

(63 citation statements)

References 26 publications

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“…This investigation will be developed further to create the numerical model of the joint, which will take into account gradual degradation of the adhesive layer and cracking process in the plastic adherends, in order to extend previously formulated damage and cracking models for materials (e.g. [32][33][34][35][36][37][38][39] and other types of the hybrid joints [19][20][21][22][23][24][25] and [28][29][30]). …”

Section: Resultsmentioning

confidence: 99%

“…It obeys: 1 -positioning of the system, 2 -initial perforation of the top sheet, 3 -forming of the SPR and 4 -unloading. For our investigations two types of dies has been prepared taking into account the geometry described in [30] and [31]. The hybrid joints consisted of: two aluminum stripes -2024 T4, and 5005, the steel tubular rivet acquired from Bollhoff Company and Loctite 3423 adhesive.…”

Section: Technology Of the Adhesive Aided Spr Jointsmentioning

confidence: 99%

“…Contour view overlapped on the polished cross sections (Fig. 5a) shows the proper hybrid joint having the die geometry proposed in [30] with 1mm cone offset and the piercing length of 5,5 mm. Fig.…”

Section: Experimental Technique For Testing Of Hybrid Jointsmentioning

confidence: 99%

“…the PSE) are so called hybrid joints, which result from combination of two single joining techniques, e.g. [19][20][21][22][23][24][25] and [28][29][30]. In this paper we focuse on the technology and experimentation of the adhesive aided self-piercing riveting (SPR) joint of the PSE.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we focuse on the technology and experimentation of the adhesive aided self-piercing riveting (SPR) joint of the PSE. Some aspects of designing process of simple SPR was described in [30].…”

Section: Introductionmentioning

confidence: 99%

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Application of Dic Technique for Monitoring of Deformation Process of Spr Hybrid Joints / Zastosowanie Techniki Dic Do Obserwacji Procesu Deformacji Hybrydowych Połaczen Typu Spr

Sadowski¹,

Kneć²

2013

Archives of Metallurgy and Materials

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Digital Image Correlation (DIC) technique gives possibility to observe deformation process in many applications including self-piercing riveting (SPR) hybrid joint. The hybrid SPR joint consists of simple SPR joint made of two adherends, steel tubular rivet (total length of 5 mm) and an adhesive. The adhesive was applied before piercing process.For specimen preparation two different aluminum alloys were used: 2024 and 5005 (2mm thickness both) with tensile strength 400 and 160MPa, respectively. For better understanding of joint forming process and to allow DIC strains observation during the joint creation, a special holder was designed with precisely polished die. The tests were performed by application of the 100kN servo-hydraulic machine, which recorded time, load, displacement and was synchronized with the DIC system.The joint forming process was carried out with 2 mm/min constant speed. During piercing process rivet and upper surface of the adherend were observed and the major strain states were estimated. The uniaxial tensile tests of single lap joints (SLJ) up to the final failure were performed and the displacements and the strains were recorded. In particular the rivet deformation was observed also during the whole loading process.The hybrid SPR joints are very effective, because the load capacity and energy absorption increase more than 1.5 times in comparison to the simple SPR joints.Keywords: DIC, SPR, joining process, hybrid joint Technika Cyfrowej Korelacji obrazu (DIC) pozwala na obserwacje procesów deformacji w różnych aplikacjach -w tym dla hybrydowych połączeń typu SPR (przebijanych za pomocą nita). Hybrydowe połączenie typu SPR składa się ze standardowego połączenia SPR -próbka jednozakładowa przebita stalowym nitem pół-rurkowym (długość całkowita 5 mm) oraz warstwy kleju pomiędzy zakładkami naniesionego przed procesem przebijania. Do stworzenia próbek zostały użyte dwa typu aluminium o różnej plastyczności 2024 i 5005 o grubości 2 mm każdy i wytrzymałości odpowiednio 400MPa i 160 MPa. W celu pełniejszego zrozumienia procesu formowania się złącza został zaprojektowany specjalny uchwyt z precyzyjnie wyszlifowaną matrycą. Badania zostały przeprowadzone przy pomocy maszyny osiowej o zakresie 100kN, zsynchronizowaną z systemem DIC.Proces tworzenia się złącza był prowadzony ze stałą prędkością 2 mm/min. Podczas procesu tworzenia złącza obserwowano nit oraz górną powierzchnię łączonych blach i główne odkształcenia zostały wyznaczone. Badania przeprowadzono na próbkach zakładkowych do ich zniszczenia rejestrując przemieszczenia i odkształcenia. W szczególności obserwowano deformację nita w całym procesie deformacji.Hybrydowe połączenia typu SPR są bardzo efektywne, ponieważ uzyskuje się wzrost siły przenoszonej przez połączenie i energii absorbowanej ponad 1.5 raza większych w porównaniu do prostego złącza typu SPR.

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Section: Resultsmentioning

confidence: 99%

Section: Technology Of the Adhesive Aided Spr Jointsmentioning

confidence: 99%

Section: Experimental Technique For Testing Of Hybrid Jointsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Dic Technique for Monitoring of Deformation Process of Spr Hybrid Joints / Zastosowanie Techniki Dic Do Obserwacji Procesu Deformacji Hybrydowych Połaczen Typu Spr

Sadowski¹,

Kneć²

2013

Archives of Metallurgy and Materials

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A novel energy‐based framework for characterizing the strain‐softening behavior of CFRP composites using cyclic loading

Zhang

Liu

et al. 2022

Polymer Composites

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Complex failure modes of carbon fiber reinforced polymer (CFRP) composites create significant challenges for CFRP components' progressive damage analysis (PDA). Though important in PDA, the phenomenological strain‐softening model (SSM) for characterizing the degradation behavior in the fiber‐parallel direction (dominated by fiber breakage) of CFRP is difficult to be constructed by current approaches due to the poor toughness of carbon fibers. The work aims to obtain a refined SSM of plain woven CFRP composites through experimental methods and apply it to the PDA of corresponding components. A novel phenomenological cyclic‐loading‐based strain‐softening model (CLSSM) was proposed based on the theory of equivalent dissipation energy during static and cyclic loading. Firstly, the release behavior of dissipation energy during the cyclic loading process was researched. Secondly, a newly designed search algorithm taking degraded mechanical properties during cyclic loading as input and taking the static strain‐softening curve as output was utilized to build up CLSSM. Thirdly, a three‐point bending test was conducted and a corresponding numerical model was constructed for comparison to verify the proposed model. The entire framework is highly programmatic, and results show that CLSSM is fast for characterizing the strain‐softening behavior, and effectively simulates the progressive failure process of CFRP components.

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The comprehensive experimental investigation of tensile strength and sealing performance for wet‐assembly hybrid bonded‐bolted (WHBB) joint with different bolt‐hole clearance

et al. 2023

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Wet‐assembly hybrid bonded/bolted (WHBB) joint is a kind of sealing fastener that contains sealant both in bolt‐hole clearance and between CFRP laminates, which is increasingly applied in composite aircraft fuel tanks. As the guarantee of tensile strength and sealing performance, the thickness and interface characteristics of bolt‐hole sealant layer are investigated by a newly developed comprehensive evaluation method in this paper. The results indicate that the tensile strength of WHBB joint is positively correlated with the bolt‐hole clearance. As for the sealing property of WHBB joints, the leakage rates of WHBB joints with bolt‐hole adhesive layer (0.01, 0.03 and 0.05 mm) is three orders of magnitude less than that of joints with 0 mm adhesive layer. Moreover, the rising slope of leakage rates of the WHBB joints decreases with the increase of bolt‐hole clearance under tensile fatigue loads, which means the WHBB joint with higher bolt‐hole clearance shows better tensile fatigue resistance. The micro‐morphology of bolt‐hole interface indicates that the sealing property of WHBB joints is increased significantly due to the effectively enhanced interface behavior.

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Analysis of the mechanical performance of hybrid (SPR/bonded) single-lap joints between CFRP panels and aluminum blanks

Cited by 125 publications

References 26 publications

Application of Dic Technique for Monitoring of Deformation Process of Spr Hybrid Joints / Zastosowanie Techniki Dic Do Obserwacji Procesu Deformacji Hybrydowych Połaczen Typu Spr

Application of Dic Technique for Monitoring of Deformation Process of Spr Hybrid Joints / Zastosowanie Techniki Dic Do Obserwacji Procesu Deformacji Hybrydowych Połaczen Typu Spr

A novel energy‐based framework for characterizing the strain‐softening behavior of CFRP composites using cyclic loading

The comprehensive experimental investigation of tensile strength and sealing performance for wet‐assembly hybrid bonded‐bolted (WHBB) joint with different bolt‐hole clearance

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