Strength shear test for adhesive joints between dissimilar materials obtained by multicomponent injection

Pisanu, Luciano; Santiago, Leonardo Costa; Barbosa, Josiane Dantas Viana; Beal, Valter Estevão; Nascimento, Márcio Luis Ferreira

doi:10.1016/j.ijadhadh.2018.08.007

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…The lap shear strength was evaluated by using a tensile shear test with a universal testing machine (AG-IS, Shimadzu Corporation, Japan). As mentioned in Pisanu et al [15], the conventional tensile shear test could not conduct the pure shear test since the bending moments are generated during the tensile shear test of a single lap joint. Thus, the selfdesigned fixture was used, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Selective Reinforcement of Joining Interface Using Nanofibers in Single-Lap Joints of Thermoplastic Composites Fabricated by the Injection Overmolding Process: Creep Deformation Behaviour

Matsumoto

ITABASHI

KAWASUMI

et al. 2022

WIT Transactions on the Built Environment

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An injection overmolding process enables molding and welding at the same time: a discontinuous fiberreinforced thermoplastic is injected onto the thermoformed continuous fiber-reinforced thermoplastic composites for the fabrication of complex shape parts, namely, ribs and bosses. Since the joining strength is significantly influenced by process parameters, such as resin temperature and molding pressure during the overmolding process, achieving reliable joining strength is important for increasing the load bearing capacity. The nanofibers have great potential to increase the toughness of fiber reinforced composites as secondary reinforcement. Furthermore, selective reinforcement is allowed by nanofiber addition in the matrix onto the fiber surface or interlaminar region of laminated composites. Thus, we previously proposed the selective addition of nanofillers at the joining interfaces to increase the joining strength. In this study, we attempt to reveal the effect of cellulose nanofiber (CNF) addition on creep properties for long-term use under constant load. The shear creep test was conducted under various loads and various temperatures using a self-designed fixture. Furthermore, the debonded surface of a single lap joint was observed by optical microscopy and scanning electron microscopy. We discovered that 1.0 wt% CNF addition increased the creep failure time and decreased the creep strain at the same load. Furthermore, the creep rate was significantly decreased by CNF addition regardless of temperature.

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Section: Methodsmentioning

confidence: 99%

Selective Reinforcement of Joining Interface Using Nanofibers in Single-Lap Joints of Thermoplastic Composites Fabricated by the Injection Overmolding Process: Creep Deformation Behaviour

Matsumoto

ITABASHI

KAWASUMI

et al. 2022

WIT Transactions on the Built Environment

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“…30 Premature stock break crack propagation at the SLJ overlap edge has also been reported in composites reinforced with coconut fibres. 48 In previous research efforts it was observed that the failure modes of NFRC bonded joints presented significant differences as a function of adherend material. 27,45 For the intralaminar hybridization technique (i.e.…”

Section: Factors Affecting the Mechanical Performance Of Composites A...mentioning

confidence: 98%

Methods to increase the mechanical performance of composite adhesive joints: An overview with focus on joints with natural fibre composite adherends

Queiroz

2022

Journal of Composite Materials

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This paper presents an overview of the recent developments in the main methods used to increase the mechanical performance of composite adhesive joints with focus on joints with natural fibre reinforced composite (NFRC) adherends. First, the main factors that affect the performance of composite adhesive joints were briefly discussed. Further, the main methods used to increase the mechanical performance of natural fibre-reinforced composite adhesive joints are presented. Since, the literature regarding these methods applied to NFRC adherends is relatively scarce, in addition, promising techniques applied to synthetic fibre-reinforced composite joints, which behave in a similar manner and whose results can be extrapolated with a great deal of confidence to NFRCs are also briefly discussed. Finally, some conclusions and an outlook on critical challenges and future perspectives are summarized. The application of sustainable green composites may further increase in many structural and non-structural applications if their joining behaviour is well-known and established.

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“…In this work, to evaluate the adhesive strength of dissimilar polymers and composites of coconut fibers, a specific procedure was applied considering a Brazilian patent on a new mechanical device, as described previously by Pisanu et al [ 17 ] (BR 10 20,160 21054). This apparatus measures the adhesive strength between two overmolded materials in an overlapping region and disregards the influence of the forces resulting from the bending moment and/or peeling stress, as described in recent studies performed by Pisanu et al [ 18 , 19 , 20 ]. These experiments evaluated the influence of the injection molding variables over the adhesive forces of overmolded polypropylene (PP) and PP–coir fiber composites, as described in [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Process Parameters on the Adhesive Strength of Dissimilar Polymers Obtained by Multicomponent Injection Molding

et al. 2021

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The growing demand in the consumer market for products with sustainable technologies has motivated new applications using overmolded natural fiber composites. Therefore, studies have been conducted mainly to understand the adhesive properties of overmolded parts. In the present study, a polypropylene (PP) composite with 30% coconut fibers without additives was developed with the aid of a corotating twin screw extruder. Subsequently, a multicomponent injection mold was developed based on the geometry of the ISO 527 type I specimen, in which samples overmolded with PP and PP–coconut-fiber composite, with the overlap in the central area, were obtained to evaluate the adhesive strength of dissimilar materials. The objective of this study was to evaluate the bond between PP and PP–coconut-fiber composite under different processing conditions using an adhesive strength testing device to perform a pure shear analysis. The experimental conditions followed a statistical design considering four factors in two levels and a significance level of 5%. The results indicated that adhesive strength increased significantly as the overlap area increased. It was observed that temperature and injection flow rate were the factors that most contributed to strengthening the bonds of dissimilar materials.

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Strength shear test for adhesive joints between dissimilar materials obtained by multicomponent injection

Cited by 13 publications

References 12 publications

Selective Reinforcement of Joining Interface Using Nanofibers in Single-Lap Joints of Thermoplastic Composites Fabricated by the Injection Overmolding Process: Creep Deformation Behaviour

Selective Reinforcement of Joining Interface Using Nanofibers in Single-Lap Joints of Thermoplastic Composites Fabricated by the Injection Overmolding Process: Creep Deformation Behaviour

Methods to increase the mechanical performance of composite adhesive joints: An overview with focus on joints with natural fibre composite adherends

Effect of the Process Parameters on the Adhesive Strength of Dissimilar Polymers Obtained by Multicomponent Injection Molding

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