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A study on the fatigue characteristics of SLS 3D printed PA2200 according to uniaxial cyclic tensile loading  

Park, Jun-Soo (Dept. of Mechanical Design and Manufacturing Engineering, Seoul National University of Science and Technology)
Jeong, Eui-Chul (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
Choi, Han-Sol (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
Kim, Mi-Ae (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
Yun, Eon-Gyeong (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
Kim, Yong-Dae (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
Won, Si-Tae (Dept. of Mechanical Design and Manufacturing Engineering, Seoul National University of Science and Technology)
Lee, Sung-Hee (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
Publication Information
Design & Manufacturing / v.14, no.1, 2020 , pp. 49-55 More about this Journal
Abstract
In this study, the fatigue behavior and fatigue life characteristics of PA2200 specimens fabricated by SLS 3D printer were studied. Fatigue tests were performed according to the standard specification (ASTM E468) and fatigue life curves were obtained. In order to perform the fatigue test, mechanical properties were measured according to the test speed of the simple tensile test, and the self-heating temperature of the specimen according to the test speed was measured using an infrared temperature measuring camera in consideration of heat generation due to plastic deformation. There was no significant difference within the set test speed range and the average self-heating temperature was measured at 38.5 ℃. The mechanical strength at the measured temperature showed a relatively small difference from the mechanical strength at room temperature. Fatigue test conditions were established through the preceding experiments, and the loading conditions below the tensile strength at room temperature 23 ℃ were set as the cyclic load. The maximum number of replicates was less than 100,000 cycles, and the fracture behavior of the specimens with the repeated loads showed the characteristics of Racheting. It was confirmed that SLS 3D printing PA2200 material could be applied to the Basquin's S-N diagram for the fatigue life curve of metal materials. SEM images of the fracture surface was obtained to analyze the relationship between the characteristics of the fracture surface and the number of repetitions until failure. Brittle fracture, crazing fracture, grain melting, and porous fracture surface were observed. It was shown that the larger the area of crazing damage, the longer the number of repetitions until fracture.
Keywords
SLS 3D Printing; Nylon Powder; Mechanical Properties; Uniaxial Tensile Loading; Loading Speed; Fatigue Behavior; Fatigue Life; S-N Diagram;
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