Simulation of curing-induced viscoplastic deformation: a new approach considering chemo-thermomechanical coupling

Liebl, Christoph; Johlitz, Michael; Yagimli, Bülent; Lion, Alexander

doi:10.1007/s00419-012-0639-z

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…49 Not only that, resin properties and curing degree also have a direct relationship. The degree of curing affects the viscoelasticity behavior and yield function of the resin, 50 which ultimately affects the curing deformation. Therefore, the measurement of curing degree is also necessary.…”

Section: Chemical Shrinkage Of Resinmentioning

confidence: 99%

Review of curing deformation control methods for carbon fiber reinforced resin composites

Zhang

et al. 2022

Polymer Composites

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Under the influence of extrinsic curing conditions and intrinsic properties of carbon fiber reinforced resin composites, the formation of curing deformation is inevitable, which makes the shape of the manufactured components differ from the designed structure, and even exceeds the assembly tolerance, resulting in the scrap of parts. Therefore, it is very urgent and important to optimize the curing deformation of carbon fiber reinforced resin composites. In this paper, the mechanism of stress and curing deformation is reviewed firstly, and then the factors affecting the curing deformation are summarized. In particular, from the point of view of materials in curing process, three curing deformation control strategies, including (i) reinforcement structure optimization, (ii) resin modification and process optimization, (iii) die surface compensation and tool‐part contact optimization, were proposed. And with the development of curing deformation simulation technology, the (iv) inverse design strategy before curing and (v) hot sizing method from the view of after cured were further put forward, respectively. By analyzing the link between processing details and curing deformation, it is found that the dominant factor affecting deformation may change under different conditions, so the interaction between factors needs to be further discussed. Subsequently, the effect of these distortion control methods on curing deformation was analyzed and evaluated, and the shortcomings were pointed out. Finally, the challenges existed in curing deformation research were identified, in order to contribute to the development of curing deformation research.

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Section: Chemical Shrinkage Of Resinmentioning

confidence: 99%

Review of curing deformation control methods for carbon fiber reinforced resin composites

Zhang

et al. 2022

Polymer Composites

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“…Generally, the point where the material transforms from a liquid into a solid is termed the gel-point. From this point onward a direct relation between the conversion level and the elastic [5,52], viscous [53][54][55] or even plastic properties [56] exists.…”

Section: Mechanicsmentioning

confidence: 99%

Multiphysical modeling of the photopolymerization process for additive manufacturing of ceramics

Westbeek

Dommelen

Remmers

et al. 2018

European Journal of Mechanics - A/Solids

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DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

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“…To describe the material behaviour of the medical grade silicone, a suitable material model has to be applied. Small strain curing models considering a process-dependent viscoelastic approach are found among others in [1,8,17,33]. The key point of the formulations is to ensure the stressfree curing behaviour, i.e.…”

Section: Introductionmentioning

confidence: 99%

A curing model for the numerical simulation within additive manufacturing of soft polymers using peridynamics

2020

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Within this paper, the modelling and simulation of extrusion-based Additive Manufacturing (AM) processes of curing polymers is presented. The challenge of the AM is the adjustment of processing parameters. This includes the application of laser radiation to locally accelerate the curing in order to control the final geometry of the implant. Since complex multi-physical coupling effects are hardly predictable by operator experience, numerical simulations are beneficial. When the underlying physical effects of the AM processes are captured correctly within the simulations, a realistic representation of the process is possible. To model the material behaviour during the process, a process-dependent large strain curing model is formulated, considering the stress free curing behaviour of the material. State-of-the-art models are not able to model the fluid-like behaviour of low cured polymers. This needs a formulation that takes into account finite deformations. Hence, the current model is extended to finite plasticity using a process-dependent yield function. This allows the modelling of material spreading in the fluid-like state by simultaneously reducing the accumulation of elastic stored energy, which would lead to an unintentional and non-physical bounce-off behaviour otherwise. For the numerical simulations, an enhanced version of the peridynamic correspondence formulation using fractional subfamilies with associated volume weighting factors is introduced and implemented. Besides the specific laser modelling as a volumetric heat source, a local–non-local coupling of the arising thermo-chemo-mechanical coupled equations is introduced within the peridynamic framework. Within the simulations, the applicability of the plasticity-based approach to model material spreading in the fluid-like state is presented. Finally, the software for extrusion-based printing processes is developed and the complete thermo-chemo-mechanical coupled AM process is simulated. It is shown that higher geometrical precision is obtainable in terms of a reduced material spreading by the application of a laser radiation. The model constitutes the first step of the virtual implant development regarding the optimisation possibilities during the AM process.

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Simulation of curing-induced viscoplastic deformation: a new approach considering chemo-thermomechanical coupling

Cited by 13 publications

References 17 publications

Review of curing deformation control methods for carbon fiber reinforced resin composites

Review of curing deformation control methods for carbon fiber reinforced resin composites

Multiphysical modeling of the photopolymerization process for additive manufacturing of ceramics

A curing model for the numerical simulation within additive manufacturing of soft polymers using peridynamics

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