FB 15 Maschinenbau
https://daks.uni-kassel.de/handle/123456789/9
2024-03-28T09:42:55ZCombining Lean Management and Circular Economy: A Literature Review [Repository]
https://daks.uni-kassel.de/handle/123456789/69.2
Combining Lean Management and Circular Economy: A Literature Review [Repository]
{"last":"Wittine","first":"Nicolas","affiliation":"Universität Kassel, Fachgebiet für Produktionsorganisation und Fabrikplanung","id":"orcid","id_value":"0009-0008-4454-6335"}
The associated paper explores the combination of LM and CE by providing an in-depth examination of CE, an overview of LM, and a systematic literature review. The review builds upon 1,609 sources (2015-2024), reduced to 32 relevant papers, and adds expert insights to uncover conflicts, synergies, and success factors.
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The provided Excel file contains the researched literature and documents the process and findings. Each colored tab contains data for the table and figures in the paper. The main finding is found in "Table Paper" and is used to build Table 2 of the paper.
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Each PDF contains an interview protocol, numbered according to the paper’s Table 4. Each protocol contains a description of the expert and a discussion summary.
Influence of Ethylene Oxide and Gamma Irradiation Sterilization Processes on the Properties of Poly-L-Lactic-Acid (PLLA) Materials [Dataset]
https://daks.uni-kassel.de/handle/123456789/67
Influence of Ethylene Oxide and Gamma Irradiation Sterilization Processes on the Properties of Poly-L-Lactic-Acid (PLLA) Materials [Dataset]
{"last":"Krug","first":"Natalie","affiliation":"University of Kassel, Institute of Materials Engineering, Plastics Engineering","id":"orcid","id_value":"0009-0008-3284-188X"}
In order to encourage the substitution of petrochemical polymers in medical technology with sustainable, bio-based materials, there is an urgent need for further investigations, especially data regarding their sterility performance. Within the scope of the investigations, selected material properties of poly-L-lactic-acid (PLLA), a specific type of poly(lactic-acid) (PLA), were analyzed before and after sterilization (using ethylene oxide or gamma irradiation) in order to investigate deviations in its chemical structure, wettability, optical, and mechanical properties. In particular, parameters such as molecular weight, complex viscosity, tensile strength, water contact angle, and color were discussed. Sterilization temperatures close to the glass transition of PLA, high humidity, and interactions with the ethylene oxide molecules have resulted in an increase in crystallinity, a decrease in elongation at break, and in some cases, a variation in wettability. As a consequence of exposure to high-energy radiation, the material’s toughness is reduced due to chain scission, which is manifested through a decrease in molecular weight, an increase in crystallinity, and a partial change in surface energy. For the selected PLLA-materials (Luminy® L130, NP HT 202, and NP HT 203), ethylene oxide sterilization resulted in a comparatively minor variation in the characteristics behavior, and was chosen as the preferred method.; IMPORTANT: In case you use the data please cite our corresponding article: DOI: 10.3390/polym15163461
Source code for a program to calculate Schmid-factors
https://daks.uni-kassel.de/handle/123456789/57
Source code for a program to calculate Schmid-factors
{"last":"Frenck","first":"Johanna-Maria","affiliation":"University of Kassel, Institute of Materials Engineering, Metallic Materials","id":"orcid","id_value":"0000-0003-2624-2916"}
Investigation on the mechanical properties of single crystalline Fe-34.7%Mn-13.4%Al-7.7%Ni-1.5%Cr (at.-%) shape memory alloy specimens revealed very good superelastic properties. The results of incremental strain tests show that the crystallographic orientation has a considerable impact on the superelastic performance, eventually resulting from the formation of twinned or detwinned martensite to accommodate strain as well martensite variant interaction. In situ optical microscopy images and the calculation of Schmid-factors allow for an in-depth assessment of the martensite phase transformation and the influence of martensite selection on recoverability. The calculation of the Schmid-factors can be based on the martensitic phase transformation that ideally follows the Kurdjumov-Sachs relationship. In order to allow these calculations to be easily transferred to different crystallographic orientations, the calculations performed were generalized and converted to a computer code. The program developed allows to determine the Schmid factors of all 24 possible shear systems as well as the corresponding trace angles that are left by the martensite phase on the surface. The program is freely accessible and available for use by anyone at
http://frenck.net/Math/Cube/; Used programming language: Javascript. <br />
IMPORTANT: In case you use the software please cite the DOI of the source code.
Reconstruction of Incomplete X-Ray Diffraction Pole Figures Using Deep Learning
https://daks.uni-kassel.de/handle/123456789/48.4
Reconstruction of Incomplete X-Ray Diffraction Pole Figures Using Deep Learning
{"last":"Vollmer","first":"Malte","affiliation":"University of Kassel, Institute of Materials Engineering, Metallic Materials"}
Iron-based shape memory alloys are promising candidates for large-scale structural applications due to their cost efficiency and the possibility of using conventional processing routes from the steel industry. However, recently developed alloy systems like Fe–Mn–Al–Ni suffer from low recoverability if the grains do not completely cover the sample cross-section. To overcome this issue, small amounts of titanium can be added to Fe–Mn–Al–Ni. This significantly enhance abnormal grain growth due to a considerable refinement of the subgrain sizes, whereas small amounts of chromium lead to a strong inhibition of abnormal grain growth. By tailoring and promoting abnormal grain growth it is possible to obtain very large single crystalline bars.; This dataset provides pole figure measurements performed on a 300 mm long Fe-Mn-Al-Ni-Ti bar with a diameter of 6.3 mm consisting of two abnormally grown grains. The investigated lattice plane 211 of the present body centered cubic (BCC) phase was measured using a cobalt anode at theta = 98° on the diffractometer Seifert XRD 3003 Micro operated at 40 kV and 35 mA, equipped with a monochromator in the secondary beam paths and a polycapillary with a beam size of 2 mm in diameter in the primary beam path.; IMPORTANT: In case you use the data please cite our corresponding article https://doi.org/10.1038/s41598-023-31580-1.