Ziel der Arbeit war es in einem pulvermetallurgischen Ansatz gasverdüste Ti-45Nb-Pulver mittels Heißpressen zunächst zu kompakten Formkörpern zu verpressen und über geeignete Gefügeeinstellung und bestmöglicher Partikelverzahnung maximale Druckfestigkeiten bei gleichzeitig niedrigem E-Modul zu erhalten. In einem nächsten Schritt wurden mittels Heißpressen mit Platzhalterphase definierte Porenanteile in die Formkörper eingebracht und der Einfluss dieser auf die mechanischen Eigenschaften untersucht. Die porösen Strukturen sollen als Knochenersatzmaterial in einem osteoporotischen Knochendefekt dienen. In einem solchen Defekt stellen Druckkräfte den dominierenden Belastungsfall dar. Die mechanische Charakterisierung der im Rahmen der Arbeit erzeugten porösen Formkörper erfolgte daher im Druckversuch. Die Oberfläche eines metallischen Knochenersatzmaterials muss chemisch und topografisch modifiziert werden, um damit Einfluss auf das Gleichgewicht zwischen zellbiologischen Prozessen zum Knochenauf- und -abbau an der Grenzfläche zwischen Implantat und Knochengewebe zu nehmen. Im speziellen Fall von Osteoporose, wo dieses Gleichgewicht nachweislich gestört ist, spielt die Stimulation des Knochenaufbaus eine besondere Rolle. Für Strontiumspezies konnte eine das Knochenwachstum stimulierende Wirkung und die Inhibierung des Knochenabbaus in mehreren Studien gezeigt werden. Ein weiteres Ziel der Arbeit stellte daher die Erzeugung von strontiumhaltigen Hydroxylapatitschichten mittels Elektrodeposition dar. Die erzeugten Schichten wurden strukturell, morphologisch und chemisch charakterisiert. Weiterhin wurden die Sr-Freisetzung aus den Schichten und die zellbiologische Wirkung untersucht. Konzepte zur Abscheidung auf planaren Legierungsoberflächen konnten in einem nächsten Schritt im Rahmen einer Machbarkeitsstudie auf poröse Ti-45Nb Strukturen übertragen werden. / Aim of the work was the production of dense Ti-45Nb material by hot-pressing of gas-atomized Ti-45Nb powder. Maximum compression strength and low Young’s modulus values were obtained by means of a tailored microstructure and improved interlinking of the powder particles. In a next step defined amounts of porosity were introduced by hot-pressing the alloy powder with a space holder phase. The produced porous structures should be used as bone substitute material in an osteoporotic bone defect. Compression is the dominating load in such a defect. Accordingly, compression tests were conducted to assess the mechanical properties. The surface state of metallic bone replacement materials plays an important role regarding the osseointegration of the material into the surrounding bone tissue. A chemical and topographical modification of the surface is necessary to influence the equilibrium between the formation and resorption of bone on the interphase of implant and bone tissue. Especially in case of osteoporosis the stimulation bone formation is essential. Several studies have shown that strontium species have a positive effect on the formation of bone tissue and the inhibition of bone resorption. Therefore, a further aim of the work was the electrodeposition of Sr-containing hydroxyapatite layers and the structural, morphological and chemical characterization of the deposited layers. Furthermore, the release of Sr-species from the layers and the effect on hMSC (human mesenchymal stroma cells) were examined. Originating from studies on planar alloy surfaces, the transfer of the deposition approaches was shown in a proof of concept on the porous Ti-45Nb scaffolds.

Приведен обзор случаев использования изделий, изготовленных по аддитивной технологии для имплантации. Проанализирован международный стандарт на испытания пористых материалов, изготовленных по аддитивной технологии. Выявлены проблемы и предположительные пути их решения при использовании изделий, изготовленных аддитивным методом из сплавов на основе титана. решена краевая задача определения напряженно-деформированного состояния ячеистого имплантат методом конечных элементов в программном модуле ABAQUS. Рассмотрен вопрос влияния геометрии ячеек испытываемого материала на механические свойства конечного изделия для трех различных форм ячеек. Рассмотрен вопрос влияния трения между испытываемой заготовкой и бойками испытательной машины на свойства конечного изделия при различных уровнях трения. / An overview of the cases of using products made using additive technology for implantation is given. The international standard for testing porous materials manufactured by additive technology is analyzed. The problems and possible ways of their solution are revealed when using products manufactured by the additive method from titanium-based alloys. the boundary value problem of determining the stress-strain state of a cellular implant by the finite element method in the ABAQUS software module has been solved. The question of the influence of the geometry of the cells of the test material on the mechanical properties of the final product for three different cell shapes is considered. The question of the influence of friction between the tested workpiece and the strikers of the testing machine on the properties of the final product at various levels of friction is considered.

Объектом исследования является (α + β) - титановый сплав мартенситного класса ВТ6. Метод конечных элементов при помощи различных программных комплексов является перспективным способом прогнозирования и выявления зон локализации эквивалентных деформаций и напряжений в образцах из титанового сплава ВТ6. Предоставляется возможность расчетным путем создать ячеистую структуру имплантата с пониженным модулем упругости. В связи с этим в работе была поставлена цель: изучить механические свойства ячеистых структур и субпериостального дентального экзо-имплантата из сплава ВТ6 медицинского назначения, полученного аддитивным методом. / The object of research is (α + β) – titanium alloy of martensite class VT6. The finite element method with the help of various software packages is a promising method for predicting and identifying localization zones of equivalent deformations and stresses in samples made of titanium alloy VT6. It is possible to create a cellular structure of the implant with a reduced modulus of elasticity by calculation. In this regard, the aim of the work was to study the mechanical properties of cellular structures and subperiosteal dental exo-implant made of VT6 alloy for medical purposes, obtained by the additive method.

No description available.

This project was conducted as a case study at Öhlins Racing AB, a manufacturer of suspension systems for automotive applications. Öhlins usually manufacture their components by traditional methods such as forging, casting, and machining. The project aimed to investigate how applicable Additive Manufacturing (AM) is to manufacture products for suspension systems to add value to suspension system components. For this, a proof of concept was designed and manufactured. The thesis was conducted at Öhlins in Upplands Väsby via the consultant firm Combitech.  A product catalog was searched, screened, and one part was selected. The selected part was used as a benchmark when a new part was designed for AM, using methods including Topology Optimization (TO) and Design for Additive Manufacturing (DfAM). Product requirements for the chosen part were to reduce weight, add functions, or add value in other ways.  Methods used throughout the project were based on traditional product development and DfAM, and consisted of three steps: Product Screening, Concept Development, and Part Design. The re-designed part is ready to be manufactured in titanium by L-PBF at Amexci in Karlskoga.  The thesis result shows that at least one of Öhlin's components in their product portfolio is suitable to be chosen, re-designed, and manufactured by AM. It is also shown that value can be added to the product by increased performance, in this case mainly by weight reduction. The finished product is a fork bottom, designed with hollow structures, and is ready to print by L-PBF in a titanium alloy.