Design and Implementation of a Force Dynamometer for Friction Stir Welding
- 58 Downloads
The locations of the strain nodes on the extended octagonal ring force transducer (EOR) have been examined by many studies in the literature. However, there is a considerable lack of agreement between the different studies due to different assumptions and approaches used to define nodal locations. Because an exact solution for the stress and strain distributions in the octagonal ring does not exist, some researchers used the solution of the classical circular ring as a first approximation. Others used the finite element method to obtain a solution. But very few studies attempted to investigate the effect of geometry of the ring itself on the solution. In this work, the stress and strain distributions in an EOR transducers of varying geometries have been investigated by the finite element method and the locations of strain nodes and those of maximum sensitivity were determined and compared with the literature. It was found that strain node locations vary with ring geometry, but do not generally coincide with the classical solution of the circular ring. The strain node locations are also not coinciding with maximum sensitivity locations for horizontal force measurement. An EOR dynamometer was fabricated based on the results of this study. The dynamometer was calibrated and tested in friction stir welding. It was shown that the dynamometer response is highly linear and with very small cross talk.
KeywordsExtended octagonal ring Strain node Cross talk Sensitivity Finite element analysis
Unable to display preview. Download preview PDF.
- 3.Afzalinia, S.; Roberge, M.: An extended octagonal ring transducer for the compression chamber of a large square baler. J. Agric. Sci. Technol. 11, 377–389 (2009)Google Scholar
- 4.Abbaspour-Gilandeh, Y.; Khanramaki, M.: Design, construction and calibration of triaxial dynamometer for measuring forces and moments applied on tillage implements in field conditions. J. Metrol. Soc. India 28(2), 119–127 (2013)Google Scholar
- 5.Loewen, E.G.; Cook, N.H.: Metal cutting measurements and their interpretation. Proc. Sot. Exp. Stress Anal. 13(3), 57 (1956)Google Scholar
- 9.Dandage, R.V.; Bhatwadekar, S.G.; Bhagwat, M.M.: Design, development and testing of a four component milling tool dynamometer. Int. J. Appl. Eng. Technol. 2(1), 45–50 (2012)Google Scholar
- 12.Nalavade, P.; Salokhe, V.; Niyamapa, T.: Strain node identification by FEM and measurement of disc forces by double extended octagonal ring transducer. J. Food Agric. Environ. 8(2), 730–735 (2010)Google Scholar
- 13.Shishvan, S.H.; Akdeniz, R.C.; Gilandeh, Y.A.; Akkus, G.: The evaluation and comparison of stress node on extended octagonal ring transducer by strain energy theory and finite element method. J. Agric. Mach. Sci. 7(3), 299–303 (2011)Google Scholar