Fractographic evaluation of welded joints of PPS/glass fiber thermoplastic composites

Barbosa, Lorena Cristina Miranda; Souza, Samia Danuta Brejão de; Botelho, Edson Cocchieri; Cândido, Geraldo Maurício; Rezende, Mirabel Cerqueira

doi:10.1016/j.engfailanal.2019.04.032

Cited by 36 publications

(20 citation statements)

References 20 publications

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“…Similar features were noticed by Barbosa, L.C.M. et al where the welding performance of PPS/glass fiber composite was investigated [76]. On the bottom adherend, as seen from Figure 22d, the fibers are found to be covered with resin and the fibre pull out is observed at the ED integrated site, which potentially increases the lap shear strength of the specimen.…”

Section: Fractographysupporting

confidence: 82%

“…This can be clearly observed from Figures 13 and 14, where a small change of weld time by 0.5 s resulted in a considerable change in in LSS. Similarly, the results in the literature also state that the weld time is one of the most influencing factors in welding [42,76,78]. ED has the minimum contribution for LSS value for integrated ED configuration.…”

Section: Analysis Of Variance (Anova) Resultsmentioning

confidence: 74%

“…This shows that the flat ED affects the LSS value more than the integrated ED, and the thickness of ED film is an important selection parameter for ultrasonic welding. Figure 22 (b) also shows the fibre imprinting features on the resin, which was caused due to the excellent carbon fibre impingement/anchorage during the welding process [76]. This feature signifies the excellent carbon fibre/Elium® interfacial bond after welding.…”

Section: Fractographymentioning

confidence: 90%

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Ultrasonic Welding of Novel Carbon/Elium® Thermoplastic Composites with Flat and Integrated Energy Directors: Lap Shear Characterisation and Fractographic Investigation

et al. 2020

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The current research work presents a first attempt to investigate the welding attributes of Elium® thermoplastic resin and the fusion bonding using ultrafast ultrasonic welding technique. The integrated energy director (ED) polymer-matrix composites (PMCs) panel manufacturing was carried out using the Resin Transfer Moulding (RTM) technique and the scheme is deduced to manufacture a bubble-free panel. Integrated ED configurations and flat specimens with Elium® film of different thickness at the interface were investigated for ultrasonic welding optimization. Optimised weld time for integrated ED and flat Elium® panels with film (0.5 mm thick) configuration was found to be 1 s and 5.5 s, respectively. The ED integrated configuration showed the best welding results with a lap shear strength of 18.68 MPa. The morphological assessment has shown significant plastic deformation of Elium® resin and the shear cusps formation, which enhances the welding strength. This research has the potential to open up an excellent and automated way of joining Elium® composite parts in automotive, wind turbines, sports, and many other industrial applications.

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Section: Fractographysupporting

confidence: 82%

Section: Analysis Of Variance (Anova) Resultsmentioning

confidence: 74%

Section: Fractographymentioning

confidence: 90%

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Ultrasonic Welding of Novel Carbon/Elium® Thermoplastic Composites with Flat and Integrated Energy Directors: Lap Shear Characterisation and Fractographic Investigation

et al. 2020

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“…Resistance welding is a process where joining the interface of the adherend is achieved by resistive heating generated by passing an electric current. It is necessary to place an additional foreign material like a wire or a braid at the interface of the adherend [26,64]. The resistive heat causes the surrounding polymers to melt, followed by the cooling.…”

Section: Composite Joining Methodsmentioning

confidence: 99%

Advances in Ultrasonic Welding of Thermoplastic Composites: A Review

et al. 2020

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The ultrasonic welding (UW) technique is an ultra-fast joining process, and it is used to join thermoplastic composite structures, and provides an excellent bonding strength. It is more cost-efficient as opposed to the conventional adhesive, mechanical and other joining methods. This review paper presents the detailed progress made by the scientific and research community to date in the direction of the UW of thermoplastic composites. The focus of this paper is to review the recent development of the ultrasonic welding technique for thermoplastic composites to thermoplastic composites, and to dissimilar materials. Different ultrasonic welding modes and their processing parameters, namely, weld time, weld pressure, amplitude, type of energy directors (EDs) affecting the welding quality and the advantages and disadvantages of UW over other bonding techniques, are summarized. The current state of the ultrasonic welding of thermoplastic composites and their future perspectives are also deliberated.

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“…Figures 16a and 15b show the top adherends with shear cusps, plastic deformation sites, good surface adhesion, and the fiber pullout with the adhered resin. All these fractographic features tended to increase the lap shear performance of the welded laminate [65]. The surface morphology study of the bottom adherend as depicted in Figure 16c shows the cohesive failure attribute with fiber rupture and pullout, which was recuperated by the matrix, indicating the damage propagation in the vicinity of the carbon fiber/Elium ® interface.…”

Section: Welding Of Elium ® Composites With Integrated Edsmentioning

confidence: 96%

Investigation on Ultrasonic Welding Attributes of Novel Carbon/Elium® Composites

et al. 2020

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Joining large and complex polymer-matrix composite structures is becoming increasingly important in industries such as automobiles, aerospace, sports, wind turbines, and others. Ultrasonic welding is an ultra-fast joining process and also provides excellent joint quality as a cost-effective alternative to other joining processes. This research aims at investigating the welding characteristics of novel methyl methacrylate Elium ® , a liquid thermoplastic resin. Elium ® is the first of its kind of thermoplastic resin, which is curable at room temperature and is suitable for mass production processes. The welding characteristics of Elium ® composites were investigated by optimizing the welding parameters with specially designed integrated energy directors (ED) and manufactured using the Resin transfer molding process. The results showed a 23% higher lap shear strength for ultrasonically welded composite joints when compared to the adhesively bonded joints. The optimized welding time for the ultrasonic welded joint was found to be 1.5 s whereas it was 10 min for the adhesively bonded joint. Fractographic analysis showed the significant plastic deformation and shear cusps formation on the fractured surface, which are typical characteristics for strong interfacial bonding.

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Fractographic evaluation of welded joints of PPS/glass fiber thermoplastic composites

Cited by 36 publications

References 20 publications

Ultrasonic Welding of Novel Carbon/Elium® Thermoplastic Composites with Flat and Integrated Energy Directors: Lap Shear Characterisation and Fractographic Investigation

Ultrasonic Welding of Novel Carbon/Elium® Thermoplastic Composites with Flat and Integrated Energy Directors: Lap Shear Characterisation and Fractographic Investigation

Advances in Ultrasonic Welding of Thermoplastic Composites: A Review

Investigation on Ultrasonic Welding Attributes of Novel Carbon/Elium® Composites

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