From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Schematic of the Moore type four-point rotary bending fatigue testing machine: 1, specimen; 2, gripping part; 3, gripping part; 4, load arm; 5, loads; 6, fixed joint; 7, bearing; 8, bearing; 9, electric motor; 10, flexible coupling

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Initial design of threaded fatigue test specimen

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Modified threaded fatigue test specimen for machining

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Final design threaded fatigue test specimen for machining

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Machined threaded specimens in the CNC lathe.

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Test results of the initial designed threaded fatigue test specimens. Specimens fractured in the outer of the critical test sections: (a) grip ends are grinded and Cu coated (b) screw threads are machined through the length of the specimen and Cu coated (c) limited threaded section and the length of grip ends are increased and ground (d) length of grip ends is shortened (e) length of the threaded section is increased and grip ends are Cu coated (f) length of the threaded section is increased and threads are machined throughout the length of the specimen (g) increased length of the threaded section and grip ends are Sn coated.

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Test results of modified fatigue test specimens broken from undeveloped thread (a) and broken from fully developed thread (b)

From: Design of Threaded Fatigue Test Specimen for Machining Date of download: 11/11/2017 Copyright © ASME. All rights reserved. From: Design of Threaded Fatigue Test Specimen for Machining J. Manuf. Sci. Eng. 2013;135(4):041004-041004-6. doi:10.1115/1.4024813 Figure Legend: Final design threaded fatigue test specimens, all of the specimens are fractured from the full developed screw threads in the critical test section, third (a), second (b), and first whole developed thread teeth