|
|
STUDY OF ENERGY ABSORPTION IN MICRO – STRUT LATTICE STRUCTURE PRODUCED BY SELECTIVE LASER MELTING
Vrána, Radek ; Schleifenbaum, Johannes (oponent) ; Skalon, Mateusz (oponent) ; Paloušek, David (vedoucí práce)
The present dissertation thesis is a part of the research project which is aimed to use the SLM produced lattice structures as an impact energy absorber with defined mechanical behaviour. The main goal of the thesis is the development of the numerical model of deformation behaviour of the SLM produced micro-strut lattice structure the made from AlSi10Mg. In order to achieve the main goal, it was necessary to analyse the influence of SLM process parameters on the formation of internal material defects and surface roughness during the SLM production of the micro-strut lattice structure; these defects degrade mechanical properties of the structure and their removal will improve the mechanical properties. The results show a significant influence of two main parameters – laser scanning speed and laser power. On the basis of these findings, the parameters of input energy Ein and linear energy Elin, which include both above parameters, were defined and their limit values were determined to minimize the imperfections. The deformation behaviour of the manufactured micro-strut lattice structures was analysed on the developed drop-weight impact device that allows testing with an impact energy up to of 120 J. The deformation behaviour is evaluated using the image analysis of the high-speed camera record and force record from the strain gauge. The results of the mechanical testing were used for the validation of the developed numerical model in the ANSYS Explicit software where the real shape of the produced micro-strut lattice structure was implemented in the form of an elliptical geometry along with the information on the real mechanical properties in the form of the developed material model. The resulting comparison of the experimental results and the numerical model prediction show a good match at the maximum load Fmax (deviation of 5 %) and also the entire course of sample deformation. These findings will be further used to design of energy absorber with defined mechanical properties.
|
|
| |
|
|
STUDY OF ENERGY ABSORPTION IN MICRO – STRUT LATTICE STRUCTURE PRODUCED BY SELECTIVE LASER MELTING
Vrána, Radek ; Schleifenbaum, Johannes (oponent) ; Skalon, Mateusz (oponent) ; Paloušek, David (vedoucí práce)
The present dissertation thesis is a part of the research project which is aimed to use the SLM produced lattice structures as an impact energy absorber with defined mechanical behaviour. The main goal of the thesis is the development of the numerical model of deformation behaviour of the SLM produced micro-strut lattice structure the made from AlSi10Mg. In order to achieve the main goal, it was necessary to analyse the influence of SLM process parameters on the formation of internal material defects and surface roughness during the SLM production of the micro-strut lattice structure; these defects degrade mechanical properties of the structure and their removal will improve the mechanical properties. The results show a significant influence of two main parameters – laser scanning speed and laser power. On the basis of these findings, the parameters of input energy Ein and linear energy Elin, which include both above parameters, were defined and their limit values were determined to minimize the imperfections. The deformation behaviour of the manufactured micro-strut lattice structures was analysed on the developed drop-weight impact device that allows testing with an impact energy up to of 120 J. The deformation behaviour is evaluated using the image analysis of the high-speed camera record and force record from the strain gauge. The results of the mechanical testing were used for the validation of the developed numerical model in the ANSYS Explicit software where the real shape of the produced micro-strut lattice structure was implemented in the form of an elliptical geometry along with the information on the real mechanical properties in the form of the developed material model. The resulting comparison of the experimental results and the numerical model prediction show a good match at the maximum load Fmax (deviation of 5 %) and also the entire course of sample deformation. These findings will be further used to design of energy absorber with defined mechanical properties.
|
|
| |
host ::
RSS.