Thermally Controlled Adhesive Curing during the Production of Piezo‐Metal‐Compounds: Finite Element Modeling and Analyses

Landgraf, Ralf; Ihlemann, Jörn

doi:10.1002/adem.201800411

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…Moreover, further investigations are necessary regarding the impact of the thickness and the thermal properties of the MDS cover layers on the heating curves inside rubber samples of different shape. In this regard, numerical simulations, like, e.g., the applied in [ 35 ], can help to determine the necessary heating strategies required for the vulcanization of the embedded rubber samples.…”

Section: Resultsmentioning

confidence: 99%

Media for Dimensional Stabilization of Rubber Compounds during Additive Manufacturing and Vulcanization

et al. 2021

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The current article proposes a concept for the additive manufacturing of rubber components using extrusion-based 3D printing, in which an additional medium is added to ensure the maintenance of shape within the elastomeric structure during the additive manufacturing process and in the subsequent vulcanization process. Specific requirements for the dimensional stabilization of the media were defined and suitable media were derived. Silicone rubber, molding sand, and plaster were examined in experimental vulcanization tests for their suitability as possible media with regard to shape retention. Selected rubber geometries made of NBR were embedded in these media to undergo the vulcanization process. The results show a significant influence of the media on the heating times. All media were able to ensure that the rubber geometries maintained their shape during vulcanization. Nevertheless, some side effects were found. The silicone rubber did not cure properly around the rubber sample. Therefore, it was difficult to remove it from the rubber after vulcanization. The molding sand caused an increased surface roughness on the rubber. Plaster changed the glossy surfaces at the beginning to a matte one after vulcanization and residuals were difficult to remove. However, all media can serve as stabilization media with specific changes.

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Section: Resultsmentioning

confidence: 99%

Media for Dimensional Stabilization of Rubber Compounds during Additive Manufacturing and Vulcanization

et al. 2021

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“…The method is promising for mechanobiology and mechanics of composite materials. The implemented plasticity model can be useful for the prediction of residual stresses caused by chemical curing [25,16,14]. The more accurate simulation of residual stresses allows for a rational analysis of deformation and damage in prestressed structures.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Combined experimental/theoretical approach to residual stresses within multiplicative elasto-plasticity

Tagiltsev¹,

Shutov²

2021

Preprint

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The study is devoted to geometrically non-linear modelling of viscoplastic structures with residual stresses. We advocate and develop a special approach to residual stresses based on the transition between reference configurations. The finite strain kinematics of the viscoplastic material is modelled by the multiplicative decomposition of the deformation gradient tensor. Numerical algorithms originally developed for unstressed materials are extended to materials with pre-stresses. Owing to the weak invariance of constitutive equations, the incorporation of pre-stresses happens without additional costs. Thus, the advocated approach is especially efficient. A novel experimental/theoretical method for assessment of residual stresses in welded structures is presented; the method combines advantages of purely experimental and theoretical approaches. To demonstrate the applicability of the proposed procedure, we simulate plate welding. As an example we show that the procedure allows to extrapolate the filed of residual stresses away from the measurement points.As another example, we address the reduction of weldment-related residual stresses by mechanical treatment.

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“…The limitation of the maximum attainable degree of cure can also be described by an additional diffusion factor. For this, Fournier et al [29] made a significant contribution which has been applied in various recent studies for epoxy resins, see [30], [31] and [32].…”

Section: Discussionmentioning

confidence: 99%

Experimental investigation and modelling of the curing behaviour of photopolymers

et al. 2020

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This paper focuses on the experimental investigation and modelling of the crosslinking reaction of photopolymers used in additive manufacturing processes such as digital light processing and stereolithography. Starting with general mathematical concepts for the description of the material behaviour of polymeric materials, the importance of modelling the crosslinking reaction is emphasized. In order to characterise the crosslinking reaction experimentally, photocalorimetric measurements with varying isothermal temperature and light intensity are shown. From the exothermic heat flows measured during the crosslinking reaction, the degree of cure can be determined for each experimental scenario as a function of time. It is shown that the test temperature and light intensity have a significant influence on the crosslinking reaction. A modelling approach for the description of the crosslinking reaction incorporating temperature and light intensity is presented. Moreover, parameter identification and a comparison of the proposed model with the experiments are conducted. The indentified model has an excellent match with experimental data, resulting in a least square error smaller than 3 %. The proposed model and identification method opens up several extensions for the modelling of the material behaviour.

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Thermally Controlled Adhesive Curing during the Production of Piezo‐Metal‐Compounds: Finite Element Modeling and Analyses

Cited by 7 publications

References 19 publications

Media for Dimensional Stabilization of Rubber Compounds during Additive Manufacturing and Vulcanization

Media for Dimensional Stabilization of Rubber Compounds during Additive Manufacturing and Vulcanization

Combined experimental/theoretical approach to residual stresses within multiplicative elasto-plasticity

Experimental investigation and modelling of the curing behaviour of photopolymers

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