Modulus grading versus geometrical grading of composite adherends in single-lap bonded joints

Boss, Johan; Ganesh, Venkata; Lim, Chwee Teck

doi:10.1016/s0263-8223(03)00097-7

Cited by 91 publications

(53 citation statements)

References 26 publications

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“…Sancaktar and Nirantar [17] concluded that adherend taper-ing significantly reduces peel and shear peak stresses in single-lap joints, which yields a strength improvement. These results are fully consistent with the work of Boss et al [18]. Another solution consists on bending the adherends at the bonding edge for the optimization of the stress distributions by elimination of the joints eccentricity.…”

Section: Introductionsupporting

confidence: 91%

Effect of hole drilling at the overlap on the strength of single-lap joints

Pinto¹,

Campilho

Mendes³

et al. 2011

International Journal of Adhesion and Adhesives

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Bonded unions are gaining importance in many fields of manufacturing owing to a significant number of advantages to the traditional fastening, riveting, bolting and welding techniques. Between the available bonding configurations, the single-lap joint is the most commonly used and studied by the scientific community due to its simplicity, although it endures significant bending due to the non-collinear load path, which negatively affects its load bearing capabilities. The use of material or geometric changes in singlelap joints is widely documented in the literature to reduce this handicap, acting by reduction of peel and shear peak stresses at the damage initiation sites in structures or alterations of the failure mechanism emerging from local modifications. In this work, the effect of hole drilling at the overlap on the strength of single-lap joints was analyzed experimentally with two main purposes: (1) to check whether or not the anchorage effect of the adhesive within the holes is more preponderant than the stress concentrations near the holes, arising from the sharp edges, and modification of the joints straining behaviour (strength improvement or reduction, respectively) and (2) picturing a real scenario on which the components to be bonded are modified by some external factor (e.g. retrofitting of decaying/old-fashioned fastened unions). Tests were made with two adhesives (a brittle and a ductile one) varying the adherend thickness and the number, layout and diameter of the holes. Experimental testing showed that the joints strength never increases from the un-modified condition, showing a varying degree of weakening, depending on the selected adhesive and hole drilling configuration.

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Section: Introductionsupporting

confidence: 91%

Effect of hole drilling at the overlap on the strength of single-lap joints

Pinto¹,

Campilho

Mendes³

et al. 2011

International Journal of Adhesion and Adhesives

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“…Ganesh and Choo [25] showed that spatial grading of adherend elastic modulus of an adhesively bonded single-lap joint reduced the peak elastic shear stresses and caused more uniformly distributed stresses in the adhesive layer. Boss et al [26] also compared modulus grading of the adherends with geometrical grading of the adherends, and showed Adhesively bonded joints in composite materials that the modulus grading provided reduced stresses and that combining modulus and geometrical grading could also yield a better performing adhesive joint design.…”

Section: Effect Of Joint Configurationmentioning

confidence: 99%

Adhesively bonded joints in composite materials: An overview

Banea

Silva

2009

Proceedings of the Institution of Mechanical Engineers, Part L:

456

330

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A review of the investigations that have been made on adhesively bonded joints of fibre-reinforced plastic (FRP) composite structures (single skin and sandwich construction) is presented. The effects of surface preparation, joint configuration, adhesive properties, and environmental factors on the joint behaviour are described briefly for adhesively bonded FRP composite structures. The analytical and numerical methods of stress analysis required before failure prediction are discussed. The numerical approaches cover both linear and non-linear models. Several methods that have been used to predict failure in bonded joints are described. There is no general agreement about the method that should be used to predict failure since the failure strength and modes are different according to the various bonding methods and parameters, but progressive damage models are quite promising since important aspects of the joint behaviour can be modelled by using this approach. However, a lack of reliable failure criteria still exists, limiting in this way a more widespread application of adhesively bonded joints in principal load-bearing structural applications. An accurate strength prediction of the adhesively bonded joints is essential to decrease the amount of expensive testing at the design stage.

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“…[9][10][11] Grading of composition is particularly beneficial at mechanical interfaces between dissimilar materials, where stress and strain jumps naturally arise due to mismatch in elastic properties. [12][13][14][15][16] A particularly important engineering application of such grading of interfaces is in multilayers.…”

Section: Introductionmentioning

confidence: 99%

“…To minimize the deleterious effect of such stress concentration on the performance of joints, several techniques have been proposed, among which geometrical grading such as stepping or tapering of the adherends (e.g., see ref. [13,14]) modification of the bondlayer geometry (e.g., see ref. [15]) and employing a bead at the lap ends of the bondlayer (called a "spew geometry" e.g., see ref.…”

Section: Introductionmentioning

confidence: 99%

Stress Reduction of 3D Printed Compliance‐Tailored Multilayers

et al. 2017

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Multilayered multi-material interfaces are encountered in an array of fields. Here, enhanced mechanical performance of such multi-material interfaces is demonstrated, focusing on strength and stiffness, by employing bondlayers with spatially-tuned elastic properties realized via 3D printing. Compliance of the bondlayer is varied along the bondlength with increased compliance at the ends to relieve stress concentrations. Experimental testing to failure of a tri-layered assembly in a single-lap joint configuration, including optical strain mapping, reveals that the stress and strain redistribution of the compliance-tailored bondlayer increases strength by 100% and toughness by 60%, compared to a constant modulus bondlayer, while maintaining the stiffness of the joint with the homogeneous stiff bondlayer. Analyses show that the stress concentrations for both peel and shear stress in the bondlayer have a global minimum when the compliant bond at the lap end comprises %10% of the bondlength, and further that increased multilayer performance also holds for long (relative to critical shear transfer length) bondlengths. Damage and failure resistance of multi-material interfaces can be improved substantially via the compliance-tailoring demonstrated here, with immediate relevance in additive manufacturing joining applications, and shows promise for generalized joining applications including adhesive bonding.

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Modulus grading versus geometrical grading of composite adherends in single-lap bonded joints

Cited by 91 publications

References 26 publications

Effect of hole drilling at the overlap on the strength of single-lap joints

Effect of hole drilling at the overlap on the strength of single-lap joints

Adhesively bonded joints in composite materials: An overview

Stress Reduction of 3D Printed Compliance‐Tailored Multilayers

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