PhD defence of Han Wang

8 July 2022

Han Wang defends his PhD in Computational Mechanics and Materials on July 8th, 22.

Study of the solidification of lipsticks and the resultant mechanical behavior. Application of numerical simulation to the forming process.

Han Wangconducted his PhD work in the 2MS and PSF teams under the supervision of Michel Bellet and Séverine A.E. Boyer. He defends his PhD in Computational Mechanics and Materials on July 8th, 2022 in front of the following jury:

– M. Roberto PANTANI Université de Salerne Rapporteur
– M. Philippe COUSSOT Ecole des Ponts Paris Tech Rapporteur
– Mme Véronique MICHAUD École Polytechnique Fédérale de Lausanne Examinatrice
– Mme Isabelle HÉNAUT IFP Energies Nouvelles Examinatrice
– Mme Florence DALLE Parfums Christian Dior Invitée
– M. Guillaume FRANCOIS Transvalor S.A. Invité

Abstract:

Lipsticks are formed by casting process. To understand and improve the industrial casting process, the solidification of model materials of lipsticks are studied by experimental characterization and numerical simulation. Experimentally, the crystallization kinetics of wax components on rapid cooling conditions is characterized and modelled by using the Differential Scanning Calorimetry (DSC). The mechanical constitutive model according to the progress of the solidification process is determined with different rheological testing protocols (Couette rheological tests and indentation tests). The crystallization morphology of different wax components is correlated to different cooling conditions. Numerically, the kinetics model of crystallization and the mechanical behavior law are associated and integrated in finite elements based numerical calculations. Thermomechanical phenomena of the casting process and probable causes of cast defects are analyzed by numerical simulation of the industrial process.

Keywords: lipstick, casting process, crystallization kinetics, mechanical behavior, crystallization morphology, numerical simulation

 

 

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