Modelling Inhomogeneous Mechanical Properties in Adhesive Bonds

Diebels, Stefan; Geringer, A.

doi:10.1080/00218464.2012.725612

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…This aspect results to be clearer if we consider the fact that FA experiences remodeling, which is induced by mechanical actions exchanged with the ECM [6,13,14]. The last aspect to mention is the heterogeneity associated with the integrin receptors [21]. In this respect, the integrins' heterogeneity is the result of the formation of interphase regions close to the FA and of the ECM, thereby determining the onset of micro-scale effects.…”

Section: The Modelmentioning

confidence: 99%

“…It is known that FA, ECM and integrins are typically non-homogeneous [19][20][21][22]. By considering the ECM at first, we remark that it is a complex medium comprising several species of biological elements, such as proteins and polysaccharides, which present remarkably different biochemical and mechanical properties, as well as topological and geometrical characteristics [19].…”

Section: The Modelmentioning

confidence: 99%

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Multiscale approach to decohesion in cell-matrix systems

Stefano

2023

Theoretical and Applied Mechanics - AIMETA 2022

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Abstract. We propose a model for cell-matrix decohesion that highlights the role of elasticity in this process. In doing this, we specialize our previous study of focal adhesion, an integrin mediated structure that oversees and guides the mutual interactions between cells and the extracellular matrix. Specifically, we consider a two-scale asymptotic homogenization technique to study the multi-scale nature of decohesion. Thus, we are able to use micro-structural information available at length scales smaller than those at which focal adhesions are observed. Based on classical two-scale asymptotic techniques the proposed approach allows to define effective elastic coefficients encoding the intrinsic heterogeneous properties of both focal adhesions and extracellular matrix.

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Section: The Modelmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

Multiscale approach to decohesion in cell-matrix systems

Stefano

2023

Theoretical and Applied Mechanics - AIMETA 2022

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“…The diffusion of water in the polyamide depends on various parameters such as temperature, loading conditions and time. When the surrounding humidity varies polyamide can absorb water at high relative humidities but due to plastification, it can again give up some moisture causing an in-stationary and inhomogeneous distribution of moisture in the material [4,8,10,16]. In the industry however, the local distribution of moisture is not taken into account and rather a saturated and a dry material is studied.…”

Section: Introductionmentioning

confidence: 99%

Moisture Transport In Polyamide (PA6) and Its Effect On the Mechanical Behaviour

Sharma¹,

Diebels²

2021

14th WCCM-ECCOMAS Congress

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Polyamide exhibits hygroscopic nature and can absorb up to 10 % of moisture relative to its weight. The absorbed moisture increases the mobility of the molecular chains and causes a reduction in the glass transition temperature. Thus, depending on the moisture distribution, a polyamide component can show different stiffness and relaxation times. The moisture distribution also depends on the mechanical loading of the material. However, it was noticed that the diffusion process remains unaffected when the process is compared for a loaded and an unloaded material. It is postulated that the moisture redistribution is due to an external force that takes place as a result of the pressure acting on the moisture. The diffusion process is unaffected by preloading of the dry material as the pressure is applied purely on the material and not on the absorbed moisture. However, when a saturated specimen is loaded, the pressure is exerted on the moisture too which causes its redistribution. In this work, the distribution of the absorbed moisture is simulated by a non-linear diffusion model. It is coupled with the viscoelastic behaviour of PA6. The stiffness of the viscoelastic model changes and the relaxation time reduces with increasing moisture concentration. The coupling of diffusion to mechanical loading is achieved with the recalculation of the moisture concentration caused due to the redistribution of volume. It is assumed that there is no transport of moisture, but the transport of volume and the change in volume creates a change in concentration in the specimen. This strongly coupled model has been implemented using the finite element method. The model results are compared to experiments for validation. A strongly coupled model was thus created which could reproduce the experimental results with reasonable accuracy.

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“…That data encourage extending such measurements. They are needed to model the dynamic mechanical properties of adhesive joints …”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical properties of very thin adhesive joints

Krogh

Schawe

Possart

2015

J of Applied Polymer Sci

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The effective mechanical properties of a polyurethane adhesive (oligoetherdiol, ‐triol, MDI) in gold joints (bond line thickness, dP = 35–550 µm) are studied in the linear deformation range by dynamic mechanical analysis in shear mode. These properties depend on dP: thin ones possess a higher dynamic glass transition temperature and show a narrower glass transition than the thick ones. The storage modulus rises with decreasing dP for the rubbery plateau. The results attest mechanical interphases in the polyurethane with increased crosslink density and reduced cooperative mobility than in bulk. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42058.

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Modelling Inhomogeneous Mechanical Properties in Adhesive Bonds

Cited by 9 publications

References 20 publications

Multiscale approach to decohesion in cell-matrix systems

Multiscale approach to decohesion in cell-matrix systems

Moisture Transport In Polyamide (PA6) and Its Effect On the Mechanical Behaviour

Dynamic mechanical properties of very thin adhesive joints

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