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Fatigue Life Investigation of Titanium Specimens Fabricated by 3D Printers

Dehghan Manshadi, Amir | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55654 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Adibnazari, Saeed
  7. Abstract:
  8. In various industries such as aerospace, biomedicine and automobile manufacturing, they seek to manufacture light parts with complex geometry and acceptable mechanical properties. Additive manufacturing processes have gained a special place in the field of rapid prototyping, reverse engineering, mold production, etc. brought It is very important to know the mechanical properties, especially the fatigue behavior of the parts obtained by this method. In this research, the stress-fatigue life graph of parts made of Ti-6Al-4V (grade 5), which is one of the most widely used alloys in aerial structures, was extracted by selective laser melting. For this purpose, several standard fatigue test samples have been made and by performing the fatigue test, the failure life under the influence of different values of axial stress has been determined. Then, the stress-life graph obtained from the test has been compared with the results of other researchers and with the fatigue life results of standard fatigue samples of titanium alloy (grade 5) machined and polished. In the end, it was concluded that the fatigue life of the samples printed by the additive manufacturing method is significantly lower than the samples made by conventional methods. Also, the production method has a significant effect on the value of axial fatigue life under a stress ratio of 0.1. In order to better understand the cause of reduced life, the cross-section of the broken samples have been subjected to failure analysis and observed with the help of an electron microscope. These studies showed that the failure levels of the samples made by the incremental method are different from the conventional methods. Providing solutions to increase the fatigue life of the parts made in this way, it is necessary to examine more samples and analyze the microscopic structure of the parts.
  9. Keywords:
  10. Fatigue ; Titanium ; Experimental Test ; Additive Manufacturing ; Selective Laser Melting (SLM) ; Fatigue Life

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