Most suitable evaluation method for adhesive strength to minimize bend effect in lap joints in terms of the intensity of singular stress field

Li, Rong; Noda, Nao–Aki; Takaki, Rei; Sano, Yoshikazu; Takase, Yasushi; Miyazaki, Tatsujiro

doi:10.1016/j.ijadhadh.2018.08.006

Cited by 18 publications

(3 citation statements)

References 25 publications

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“…with 10 finite elements through the thickness of the adhesive, to obtain converged stress plots. 31 For this particular analysis, the aforementioned removal of adhesive material at the adhesive corners may slightly increase peak stresses that naturally occur at these locations (as further discussed). On the other hand, the chosen location for stress extraction (at the adhesive mid-thickness) assures converged results for the chosen mesh size due to absence of stress singularities.…”

Section: Numerical Detailsmentioning

confidence: 97%

Material and adhesive effect in adhesively-bonded composite stepped-lap joints

Brito

Campilho

Moreira

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Adhesive bonding is a predominant bonding technique in the aeronautical and automotive industries. Cohesive zone models, used together with the finite element method, are a viable tool to predict the strength of adhesive joints. The main objective of this study is to evaluate experimentally and numerically (by cohesive zone model) the mechanical performance of carbon-fiber reinforced polymer stepped-lap bonded joints submitted to tensile loads, for different overlap lengths ( LO) and adhesives. The failure mode analysis showed a predominant failure type for all adhesives and good correspondence with the numerical predictions. Normalized peel ( σy) and shear ( τxy) stresses in the adhesive highly increased with LO, which then reflected on different maximum load ( Pm) evolution with LO, depending on the adhesive's ductility. The damage variable SDEG (stiffness degradation) was also evaluated and emphasized on the smaller damage zone at Pm for the brittle adhesive. A significant geometry and material effect were found on Pm of the stepped-lap joints, with benefit for large LO. In this regard, cohesive zone model revealed to be a suitable tool in determining the behavior of different joints. Comparison with joints with aluminum showed that, provided that no carbon-fiber reinforced polymer delamination occurs, stepped-lap joints between carbon-fiber reinforced polymer adherends give better results due to the higher composite stiffness.

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Section: Numerical Detailsmentioning

confidence: 97%

Material and adhesive effect in adhesively-bonded composite stepped-lap joints

Brito

Campilho

Moreira

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Ongoing research in the scientific community seeks to optimize adhesive bonding for diverse applications. Despite this, adhesive joints present two very important challenges in terms of recycling [24] and stress distribution [25][26][27][28] along the adhesive joint, particularly in joints with rigid adhesives such as epoxy resins.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Magnetization of Thermally Expandable Particles on the Thermal and Debonding Properties of Bonding Joints

Abenojar,

López de Armentia,

del Real

et al. 2024

Inorganics

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This study addresses the challenge of recycling adhesive bonds, as their disassembly is irreversible and damages the substrates. It explores the use of thermally expandable particles (TEPs), which, when heated, expand and weaken the bond. The magnetization of TEPs allows us to control their distribution using a magnetic field. The work aims to obtain magnetized TEPs, study their influence on resin curing, mechanical performance, and durability, test their mobility in graded bonds, and analyze the temperature-induced debonding process. TEPs are characterized using various techniques, including differential scanning calorimetry, nuclear magnetic resonance, and scanning electron microscopy. Additionally, the impact of 25 wt.% TEPs on epoxy resin curing is examined using the Kamal model. Adhesion and disassembly assessments were conducted through tensile shear tests using single-lap-joint specimens, while the bond durability was determined via wedge testing. It was found that magnetization reduces the debonding time, though it decreases shear strength while increasing bond durability. The crack formation energy is higher with magnetic TEPs, and total crack length is lower in long-term wedge tests. Once debonded, the substrates are sanded and reused as raw material.

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“…More recent works proposed a methodology to describe the singular stress field for structure under tension and bending with variation of bondline thickness and dissimilar substrates [2]. This methodology of estimation of the intensity of singular stress field was used to predict the failure of single lap joint [3] cylinder butt joint [4] and also double lap joint [5]. Other authors proposed design rules based on analytical models and testing of custom specimens to take into account the strong multi-axial loading at the joint [6].…”

Section: Introductionmentioning

confidence: 99%