X-ray computed tomography data of expanded polypropylene bead foams of different density under compression
Contributing person | Marek Danczak | |
Contributing person | Vinzenz Geske | |
Documentation of the data | The data provided are reconstructed x-ray computed tomography data in form of *.vol files (RAW) and configuration files *.config (ASCII) both from CERA XPlorer version 2.3.1. by Siemens. The *.vol files may be imported by FIJI/ImageJ (RAW import) or other scientific image viewers knowing the information from the *.config files (1 byte header). Filtering and image adjustments are recommended depending on purpose of analysis. The files are named according to: EPPXXX_YY.* with XXX the nominal density of the foam in kg/m³ and YY the technical compression strain in %. | |
Countries to which the data refer | GERMANY | |
Description of the data | To visualize the deformation of the foam samples, in-situ computed tomography was used in this study. Cylindrical foam specimens glued to 3D printed shims on both ends are placed in the in-situ x-ray tomography system FCTS 160-IS (FineTec FineFocus Technologies GmbH, Garbsen, Germany; X-ray source FORE 160.01C TT; flat panel detector) at TUD-ILK and scanned at distinct compression states. The x-ray CT setup is rotating around the specimen and load train. The source is 160 kV microfocus X-ray tube with a minimum focal spot of about 3 μm. The detector consists of 3200 by 2300 14 bit pixels of size 127 x 127 m². The main aquisition parameters are: acceleration voltage 70 kV, beam current 100 μA, number of projections 1440, exposure time 625 ms and the resulting voxel size is 5.418 μm. The specimens are loaded in travel control until a nominal compressive strain is reached. After a short term for releasing viscoelastic stresses the scan is performed and the process repeated. The compression steps are as follows: specimen EPP120 (nominal density 120 kg/m³) 0 %, 1 %, 5 %, 25 %, 50 %, 75 % strain specimen EPP180 (nominal density 180 kg/m³) 0 %, 1 %, 5 %, 25 %, 50 % strain EPP240 (nominal density 240 kg/m³) 0 %, 16 %, 41 % strain. For each step the complete reconstructed volume (approx. 20 Gbyte each) is provided. | |
Type of the data | Image | |
Total size of the dataset | 311696062299 | |
Author | Koch, Ilja | |
Author | Müller-Pabel, Michael | |
Author | Grüber, Bernd | |
Author | Gude, Maik | |
Upload date | 2024-07-30T07:38:06Z | |
Publication date | 2024-07-30T07:38:06Z | |
Data of data creation | 2022 | |
Publication date | 2024-07-30 | |
Abstract of the dataset | In this work, the morphology of three expanded polypropylene (EPP) bead foam specimens of differing density are studied using in-situ x-ray computed tomography. The specimens of 10 mm diameter and 10 mm length were cut from steam-chest-molded plates of 40 mm thickness. The plates are based on beads of different bulk densities (Neopolen (BASF) P92HD 105, 92HD 130, 92HD 180) and welded together in an Energy Foamer 5.0 of Kurtz Ersa using the crack-fill-method. The in-situ CT device FCTS 160 located at TU Dresden University of Technology, Institut of Lightweight Engineering and Polymer Technologie, with an x-ray CT setup rotating around the specimen and the tension/torsion-compression load train is used. The volume reconstruction is performed using CERA XPlorer (version 2.3.1. by Siemens) resulting to volume files *.vol and parameter files *.config. The provided data set enables the structure elucidation of polymer bead foam under compression. | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/505 | |
Public reference to this page | https://doi.org/10.25532/OPARA-434 | |
Publisher | Technische Universität Dresden | |
Licence | Attribution-NonCommercial-ShareAlike 4.0 International | en |
URI of the licence text | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
Specification of the discipline(s) | 4::43::405 | |
Specification of the discipline(s) | 4::41::402 | |
Title of the dataset | X-ray computed tomography data of expanded polypropylene bead foams of different density under compression | |
Research instruments | FCTS 160-IS | |
Underlying research object | foam specimens | |
Software | CERA XPlorer 2.3.1 | |
Project abstract | Particle foams are characterized by a unique combination of low density, high mechanical energy absorption under pressure, great part-design freedom and low manufacturing costs. They are thus predestined for a variety of applications, which currently include athletic shoes and safety-relevant parts of vehicle interiors. By selection of the processing parameters during foaming, the properties of the cell structure and thus the behavior of the molded parts can be specifically adjusted to the application. According to the current state of research, however, there are significant uncertainties regarding the structure-property relationships of particle foams. Thus, although calculation methods are available that are suitable for predicting macroscopic material behavior in any multiaxial stress states, they are based on substantial simplifications, such as neglecting local stress and strain maxima at the mesolevel of the foam. Hence, in the case of global pressure loading, local bending, buckling or tensile failure occur within the cell structure. The mechanical behavior is also significantly influenced by the enclosed cell gas and its compression. If the final part is subjected to cyclic load over a longer period of time, empirical studies determined a cyclical creep. Both, the interaction between cell gas and cell structure and the phenomenology of cyclic creep have not been adequately investigated yet. The project focuses on the experimental and numerical investigation of the mechanical behavior of particle foams under quasi-static as well as cyclic compressive loading and unloading. With the help of a to be developed test stand for performing compression tests under ambient pressure and the application of X-ray tomographic analyzes, the interactions between cell gas, cell structure and base polymer as well as the time-dependent mechanical properties of the particle foam are going to be investigated. The main focus is on the viscoelastic properties and the creep behavior of the particle foam as well as the global and local stress-strain curves with repetitive loading and unloading. The analysis of the cell morphology forms the basis for the numerical simulation of the particle foams. Within the project, first single loading and unloading steps are to be simulated taking into account cell structure, cell gas and viscoelasticity. In particular, inelastic effects and instabilities on the local level are to be detected and their effect on global behavior to be identified. Thus, the work is going to create important foundations for an improved material understanding, which is required for a more resource-efficient and reliable design of mechanical long-term-loaded particle foam parts. | |
Project title | Cyclic-dynamic properties of particle foams |
Files
Original bundle
1 - 15 of 15
License bundle
1 - 1 of 1
Loading...
- Name:
- license.txt
- Size:
- 4.66 KB
- Format:
- Item-specific license agreed to upon submission
- Description:
Collections
