Adhesively bonded joints composed of pultruded adherends: Considerations at the upper tail of the material strength statistical distribution

Vallée, Till; Keller, Thomas; Fourestey, Gilles; Fournier, Benjamin; Correia, João R.

doi:10.1016/j.probengmech.2008.10.001

Cited by 29 publications

(2 citation statements)

References 32 publications

(57 reference statements)

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“…Equation 8 can be implemented in a post-processing routine for FEA results (Vallée et al 2009). To compare predictions with mean values of experimental results, a standard probability of survival of P S = 0.5 has to be considered (Towse et al 1999); the corresponding value of F FEA thus is the predicted capacity.…”

Section: Strength Prediction Methodsmentioning

confidence: 99%

Structural performance of rounded dovetail connections: experimental and numerical investigations

2010

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Rounded Dovetail Connections (RDC) are a relatively new wood-to-wood connection concept that, despite the lack of design guidance in standards, has become popular in timber construction due to the widespread of modern milling machinery. Because of the anisotropic nature of wood and the complex stress-strain state in RDC, the question of their dimensioning is very complex. Experimental and numerical investigations were carried out on full scale RDC used to connect two timber members as joist to beam connections subjected to quasi-static shear loading. The influence of two geometric parameters was investigated: the dovetail height (varied between 109 and 189 mm) and the flange angle (varied between 5 and 20°). Both, serviceability and ultimate limit states were studied using analysis of variance. It was found that the joint capacity (i) depends on the dovetail height, with an optimum of approximately 2/3 of the beam height and (ii) can be considered almost independent of the flange angle. The development and implementation of a numerical model for the design process of RDC was examined and good agreement between experimental and numerical load deformation curves validated the model, thus making it suitable for developing a method to predict RDC capacity. The paper proposes a probabilistic method to predict the capacity of RDC taking into account the scale sensitivity of the material strength, which is modelled using Weibull statistics, and considers not only the magnitude of the stress fields, but also the volume over which these stress peaks act. The proposed method has immediate actionable application for the improvement of RDC design. Tragverhalten von

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Section: Strength Prediction Methodsmentioning

confidence: 99%

Structural performance of rounded dovetail connections: experimental and numerical investigations

2010

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“…The adjustment between experimental failure loads and strength predictions was however dependent on correction factors, which were justified by the authors by means of the existence of a statistical size effect in material strength. In a further development, Vallée et al [4][5] presented a probabilistic method for the strength prediction of adhesively bonded lap joints from pultruded GFRP adherends subjected to quasi-static axial tensile loading, based on the statistical distribution of the material resistance. The prediction method takes into consideration the scale sensitivity of strength, considering not only the magnitude of the stress fields, but also the volume over which they act.…”

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Experiments and Strength Prediction of a Joint Composed of a Pultruded FRP Tube Bonded to an FRP Lamella

Hehl

Vallée

Bai

2009

KEM

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Adhesively bonded connections involving pultruded FRP typically fail in a brittle manner, making their analysis a case study for the application of statistical size effects. For brittle materials, in which failure is often caused by a single critical defect, statistically based size effects on strength are adequately explained by probabilistic theories such as the Weibull strength theory. A previously implemented probabilistic dimensioning method for adhesively bonded balanced joints is extended to a complex joint involving a tube and a lamella, both made of pultruded FRP. Instead of the previously used 2d approach the extension requires a 3d formulation. The entire joint is idealized as being constituted by n elements; its survival depends on the simultaneous survival of all elements. By the means of a 3d FEA, failure triggering stress components in all n elements were determined; a probability of failure is associated to each element using the corresponding combination stresses combined into an appropriate failure criterion, hence defining a theoretical joint strength.

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Probabilistic strength prediction of adhesively bonded timber joints

2011

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Adhesively bonded joints composed of pultruded adherends: Considerations at the upper tail of the material strength statistical distribution

Cited by 29 publications

References 32 publications

Structural performance of rounded dovetail connections: experimental and numerical investigations

Structural performance of rounded dovetail connections: experimental and numerical investigations

Experiments and Strength Prediction of a Joint Composed of a Pultruded FRP Tube Bonded to an FRP Lamella

Probabilistic strength prediction of adhesively bonded timber joints

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