Beside strain intensity, stress triaxiality (pressure-stress states) is the most important factor to control initiation of ductile fracture in chip segmentation through affecting the loading capacity and strain to failure. The effect of stress triaxiality on failure strain is usually assessed by dynamic Split Hopkinson Pressure Bar (SHPB) or quasi-static tests of tension, compression, torsion, and shear. However, the stress triaxialities produced by these tests are considerably different from those in high speed machining of titanium alloys where adiabatic shear bands (ASB) are associated with much higher strains, stresses and temperatures. This aspect of shear localization and fracture are poorly understood in previous research. This paper aims to demonstrate the role of stress triaxiality in chip segmentation during machining titanium alloy using finite element method. This research promotes a fundamental understanding of thermo-mechanics of the high-speed machining process, and provides a logical insight into the fracture mechanism in discontinuous chips.
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ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference
June 9–13, 2014
Detroit, Michigan, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-4581-3
PROCEEDINGS PAPER
Stress Triaxiality in Chip Segmentation During High Speed Machining of Titanium Alloy
Xueping Zhang,
Xueping Zhang
Shanghai Jiao Tong University, Shanghai, China
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Rajiv Shivpuri,
Rajiv Shivpuri
The Ohio State University, Columbus, OH
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Anil K. Srivastava
Anil K. Srivastava
The University of Texas-Pan American, Edinburg, TX
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Xueping Zhang
Shanghai Jiao Tong University, Shanghai, China
Rajiv Shivpuri
The Ohio State University, Columbus, OH
Anil K. Srivastava
The University of Texas-Pan American, Edinburg, TX
Paper No:
MSEC2014-3915, V002T02A033; 10 pages
Published Online:
October 3, 2014
Citation
Zhang, X, Shivpuri, R, & Srivastava, AK. "Stress Triaxiality in Chip Segmentation During High Speed Machining of Titanium Alloy." Proceedings of the ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. Volume 2: Processing. Detroit, Michigan, USA. June 9–13, 2014. V002T02A033. ASME. https://doi.org/10.1115/MSEC2014-3915
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