The use of the exponential Drucker-Prager material model for defining the failure loads of the mono and bi-adhesive joints

Özer, Halil; Öz, Özkan

doi:10.1016/j.ijadhadh.2017.02.005

Cited by 33 publications

(11 citation statements)

References 24 publications

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“…Results showed a remarkable improvement in low cycle fatigue life of the joint with a length ratio of 0.2 which is 25 times higher than single adhesive. Since the ductile adhesives have more capacity to extend the plastic zone between the two substrates, they are more fatigue resistant 22,26 . So, using the ductile adhesive at bonding edges could effectively prevent the premature failure of SLJs.…”

Section: Resultsmentioning

confidence: 99%

“…All the samples had the same geometrical parameters but different adhesive length ratios defined as L 1 /L. According to previous studies, [21][22][23] the optimum length ratio is about 0.1 to 0.3 for different loading conditions and joint configurations. It should be noted that the maximum length ratio is 0.5 corresponding to a joint where the total overlap is covered by the ductile adhesive.…”

Section: Slj Geometrymentioning

confidence: 99%

“…Since the ductile adhesives have more capacity to extend the plastic zone between the two substrates, they are more fatigue resistant. 22,26 So, using the ductile adhesive at bonding edges could effectively prevent the premature failure of SLJs.…”

Section: Impact Energy Effectsmentioning

confidence: 99%

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Impact fatigue life improvement of bonded structures using the bi‐adhesive technique

Akhavan‐Safar

Jalali

et al. 2022

Fatigue Fract Eng Mat Struct

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One of the most efficient methods of improving the strength of adhesive bonds is the bi-adhesive technique. The main aim of the current study is to investigate the fatigue life of bi-adhesive joints under cyclic impact loads based on the J-N (impact energy vs. fatigue life) methodology. To achieve this, single lap joints were subjected to cyclic low energy impacts. The J-N curves were constructed using the experimental data considering Basquin's equation.According to the results, the durability of the joints against impact fatigue loads can be improved significantly (up to 17 times higher for the tested joints) using the bi-adhesive technique. The results also showed that the impact fatigue life is very sensitive to the length ratio of the ductile to the brittle adhesives in bi-adhesive joints. It was found that the total absorbed energy of the joints increases significantly by the reduction of the impact energy.

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Section: Resultsmentioning

confidence: 99%

Section: Slj Geometrymentioning

confidence: 99%

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Impact fatigue life improvement of bonded structures using the bi‐adhesive technique

Akhavan‐Safar

Jalali

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Therefore, such criteria are not suited to model adhesives [34], given that these materials are sensitive to both hydrostatic stress and shear components. The exponential-based Drucker Prager yield criterion, which is an extension of the von Mises yield criterion [33,35], considers the sensitivity of adhesives to hydrostatic stresses and is found to be a sound criterion to model failure in adhesives; thus, it is utilised in the study.…”

Section: Materials Damage Model Considered For the Adhesivementioning

confidence: 99%

“…The adhesive used in the conventional blade-type in the paper is Araldite 2015 [36], which is a ductile adhesive from Huntsman. The material data for the adhesive are derived from [35] and are listed in Table 3. A very brief explanation of the exponential-based Drucker-Prager model is provided below.…”

Section: Materials Damage Model Considered For the Adhesivementioning

confidence: 99%

A comprehensive numerical investigation of the impact behaviour of an offshore wind turbine blade due to impact loads during installation

2019

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For installing offshore wind turbines into deep waters, use of floating crane vessels is essential. One of the major challenges is their sensitivity to wave-induced vessel and crane tip motions, which can cause the impact of lifted components like blades and nacelle with nearby structures. The impact loads on fibre composite wind turbine blades are critical as several complex damage modes, capable of affecting the structural integrity, are developed. Planning of such installation tasks therefore requires response-based operational limits that consider impact loads on the blade along with their damage quantification. The research area considering the impact behaviour of the lifted blade is novel, and thus, the paper identifies vessel, blade and lifting parameters that determine impact/contact scenarios. Furthermore, for a case in which a lifted blade with its leading edge impacts the tower, a numerical modelling technique is presented in Abaqus/Explicit, and a comprehensive damage assessment of the blade and an investigation of the impact dynamics and energy evolution are performed. Sensitivity studies for two distinct blade designs and two different impact locations are considered. The results show that 7-20% of the impact energy is absorbed as damage in the blade, whereas the majority dissipates as rigid-body motions of the blade after the impact. The findings of the study highlight the requirement for advanced installation equipment, such as active tugger lines, to prevent successive impacts of wind turbine blades during installation.

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An Exponential Drucker‐Prager Constitutive Model of Polyurethane Adhesive for Finite Element Model Simulation

Zhang,

Gao,

et al. 2024

J of Applied Polymer Sci

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The elasto‐plastic model‐based finite element method (FEM) simulation can graphically describe the nonlinearly mechanical response of adhesives to various loadings. Its prediction accuracy significantly hinges on the constitutive models of the adhesives. In this study, the plasticity property of the polyurethane adhesive is characterized by the Exponential Drucker‐Prager model (EDPM), and the model parameters are identified through tensile and shear tests. The FEM simulations and validation experiments reveal that there exists a monotonically increasing nonlinear relationship between the bonding thickness and the maximum stress of the adhesive joint as well as the stress peaked in the end of the single‐lap‐joint (SLJ), while the joint strength shows a monotonically decreasing tendency with the increment of the bonding length, and the stress at the joint end is distributed uniformly. The EDPM‐based constitutive model of polyurethane adhesive can accurately delineate the elastic–plastic deformation process of the bonding joints, which lays a theoretical foundation for optimizing the material properties of the adhesive and the bonding process.

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The use of the exponential Drucker-Prager material model for defining the failure loads of the mono and bi-adhesive joints

Cited by 33 publications

References 24 publications

Impact fatigue life improvement of bonded structures using the bi‐adhesive technique

Impact fatigue life improvement of bonded structures using the bi‐adhesive technique

A comprehensive numerical investigation of the impact behaviour of an offshore wind turbine blade due to impact loads during installation

An Exponential Drucker‐Prager Constitutive Model of Polyurethane Adhesive for Finite Element Model Simulation

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