Entwicklung eines Prüfaufbaus für additiv gefertigte Prüfkörper: Entwicklung, Verifikation und Untersuchung der Festigkeit als Funktion der AM-Druckrichtung

Translated title of the contribution: Testing of additiv manufactured specimens: Development of test rig, verification, investigation of strength as function of AM-printing direction

Jürgen Glettler

Research output: ThesisMaster's Thesis

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Abstract

Additive manufacturing offers the possibility of manufacturing complex structures due to its freedom of design and generative structure. In the field of high-performance ceramics, the LCM process (¿Lithography-based Ceramic Manufacturing¿), established by Lithoz GmbH, is among the most established manufacturing methods. Its primary field of application is in the medical and aerospace industry. In this work, a testing setup and testing procedure for a novel testing body, consisting of an array of cantilever specimens, is developed and its applicability to the LCM process is shown. More specifically, the aim of this work was to develop and build a universal testing procedure which takes the special design of this testing body into account. The basic requirements for the testing setup was its implementation with a universal testing machine. Furthermore, each cantilever has to be loaded individually at the intended point of applied load. An additional condition was the parallel and central mounting of the test specimen, with the option to easily change the specimens' position during testing. The strength of testing bodies was successfully evaluated as a function of their printing-direction. The different directions are realized by three different types of samples, each representing a different incline. The evaluation of the materials strength was carried out based on Weibull-theory. Additionally, the testing procedure was investigated with respect to geometrical deviations from the ideal geometry and alignment issues during testing. The margin of error for the accuracy of stress determination was analysed and methods for a more precise evaluation were suggested. With the rather time-consuming methods used to determine the individual specimen geometry used in this work, the testing method has a margin of error of approximately 8.5% underestimation of strength. Strength variations between testing bodies manufactured in different printing jobs or with different printing directions could be distinguished.
Translated title of the contributionTesting of additiv manufactured specimens: Development of test rig, verification, investigation of strength as function of AM-printing direction
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Staudacher, Maximilian, Co-Supervisor (internal)
  • Lube, Tanja, Supervisor (internal)
Award date20 Oct 2023
DOIs
Publication statusPublished - 2023

Bibliographical note

no embargo

Keywords

  • Additive manufacturing
  • LCM
  • Strength testing
  • Weibull-theory

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