Gemala Cempaka Hapsari - Academia.edu (original) (raw)
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Papers by Gemala Cempaka Hapsari
HAL (Le Centre pour la Communication Scientifique Directe), Apr 10, 2017
Procedia Engineering, 2017
The success of micro product's industrialization depends on the conception, design and manufa... more The success of micro product's industrialization depends on the conception, design and manufacturing process. A crucial step is the characterization of the material used in the numerical simulations. Although it gives some mechanical properties of material, tensile test is far from representing the complete deformation produced in the material. Therefore another test, Micro Incremental Deformation (Micro InDef), test which has non homogeneous deformation and which is rich in characterization data is developped, based on Micro Single Point Incremental Forming (µSPIF).To modelise the limit of formability (especially the damage of materials), Lemaitre's constitutive model is chosen due to its possibility to define the material behaviour by using continuum mechanics and thermodynamics of irreversible processes. Within this study, Micro InDef as material characterization test is validated. Moreover, the material parameters identified are proven to be physical parameters, instead ...
In this paper, the micro-formability of thin sheet s is investigated by a numerical approach. A c... more In this paper, the micro-formability of thin sheet s is investigated by a numerical approach. A couple d elastic-plastic-damage model is used to predict for ming limit diagram according to the micro-Marciniak tests. The identification of the ductile damage model is first performed from micro-single point incremental form ing tests using inverse finite element method. Finally, both the mi cro-forming limit curve and the micro-forming limit stress curve
Materials & Design, 2018
International Journal of Quantitative Research and Modeling, 2020
Incremental forming is a rapid prototyping process which uses a forming tool toform a sheet metal... more Incremental forming is a rapid prototyping process which uses a forming tool toform a sheet metal according to a predetermined trajectory. In this work, a micro incremental deformation test (Micro InDef test) derived from the principle of single point incremental sheet forming is developed and proposed. A complex mechanical loading is applied and has a strong potential for the identication of inelastic behavior using inverse method. In the rst part, this work addresses the parameters identication and validation procedures of ductile damage behavior of ultra-thin sheet metal under very large strain during this instrumented Micro InDef test. An inverse nite element method based on the comparison between numerical and experimental axial forming forces of the micro incremental deformation test is employed to extract a coupled ductile damaged plastic model. In the second part, the objective is to prove the reliability of ductile damage parameters identication using forming force. The ric...
Procedia Manufacturing, 2020
Procedia Engineering, 2017
Journal of Applied Sciences, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Apr 10, 2017
Procedia Engineering, 2017
The success of micro product's industrialization depends on the conception, design and manufa... more The success of micro product's industrialization depends on the conception, design and manufacturing process. A crucial step is the characterization of the material used in the numerical simulations. Although it gives some mechanical properties of material, tensile test is far from representing the complete deformation produced in the material. Therefore another test, Micro Incremental Deformation (Micro InDef), test which has non homogeneous deformation and which is rich in characterization data is developped, based on Micro Single Point Incremental Forming (µSPIF).To modelise the limit of formability (especially the damage of materials), Lemaitre's constitutive model is chosen due to its possibility to define the material behaviour by using continuum mechanics and thermodynamics of irreversible processes. Within this study, Micro InDef as material characterization test is validated. Moreover, the material parameters identified are proven to be physical parameters, instead ...
In this paper, the micro-formability of thin sheet s is investigated by a numerical approach. A c... more In this paper, the micro-formability of thin sheet s is investigated by a numerical approach. A couple d elastic-plastic-damage model is used to predict for ming limit diagram according to the micro-Marciniak tests. The identification of the ductile damage model is first performed from micro-single point incremental form ing tests using inverse finite element method. Finally, both the mi cro-forming limit curve and the micro-forming limit stress curve
Materials & Design, 2018
International Journal of Quantitative Research and Modeling, 2020
Incremental forming is a rapid prototyping process which uses a forming tool toform a sheet metal... more Incremental forming is a rapid prototyping process which uses a forming tool toform a sheet metal according to a predetermined trajectory. In this work, a micro incremental deformation test (Micro InDef test) derived from the principle of single point incremental sheet forming is developed and proposed. A complex mechanical loading is applied and has a strong potential for the identication of inelastic behavior using inverse method. In the rst part, this work addresses the parameters identication and validation procedures of ductile damage behavior of ultra-thin sheet metal under very large strain during this instrumented Micro InDef test. An inverse nite element method based on the comparison between numerical and experimental axial forming forces of the micro incremental deformation test is employed to extract a coupled ductile damaged plastic model. In the second part, the objective is to prove the reliability of ductile damage parameters identication using forming force. The ric...
Procedia Manufacturing, 2020
Procedia Engineering, 2017
Journal of Applied Sciences, 2010