Abstract
A new load dynamometer utilizing electricresistance wire consists of a cylinder around which the resistance wire is coiled tightly. When the cylinder is compressed axially and deforms elastically, the resistance wire is strained an amount equal to the circumferential strain of the cylinder resulting from Poisson's ratio. The dynamometer is designed with attention to electrical insulation, rate of heat dissipation, compensation for temperature change of electric resistance and material for the stressed body. The reading of this load dynamometer is not affected by the bending moment due to eccentric loading, and the bridge unbalance to be measured is larger than by any other type of strain gage utilizing resistance wire.
This load dynamometer can be applied to the measuring of dynamic or transient changes in load. As one example, the tardy yielding phenomenon of thermosetting cast resins has successfully and reasonably been measured by this dynamometer without any inertia effect.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Yuasa, K., “On the Process of the Failure of Metals under Stress,” Proc. World Energy Congress, Tokyo, 315–348 (1929).
Kuroda, M., “On the Origin of the Yield-Point Phenomena of Soft Stell,”Sci. Pap. Inst. Phys. & Chem. Research, 34, No. 950, 1528–1633 (1938).
Ebihara, K., “Researches on the Piston Ring,”,10, No. 182, 107–185 (1929).
Watanabe, S., “A New Design of Cathode-Ray Oscillograph and Its Applications to Piezo-Electric Measurements,”,10, No. 212, 82–98 (1930).
Watanabe, S., “Study on Impact Test by Means of Piezo-Electricity and Cathode-Ray Oscillograph,”,10, No. 213, 99–112 (1930).
Okoshi, M., “Researches on the Cutting Force, Report I—New Designs of Tool Dynamometer,”,10, No. 220, 167–192 (1930).
Fukui, S., “Researches on the Deep Drawing Process,”,34, No. 869, 1422–1527 (1938).
Hetenyi, M., “Handbook of Experimental Stress Analysis,”John Wiley & Sons, Inc., New York (1950).
Ball, L. M., “Strain Gauge Technique,”Proc. Exp. Stress Anal., 3, No. 1, 1–22 (1945).
Ito, K., “On the Yield Point of High Polymer Solids,”Repts. Sci. Res. Inst., 31, No. 3, 165–180 (1955).
Kleine-Albers, August, “Verhalten harter Thermoplastischer Kunststoffe ber Spanlose Formgebung,”Kunststoffe, Bd. 45 Heft 7, S. 276–289 (1955).
Ito, K., “Measuring Temperature Dependence of Mechanical Properties of Plastics,” Modern Plastics, 167–172 (Nov. 1957).
Ito, K., “A New Simple Measuring Method for Temperature Dependence of Mechanical Behaviors of High Polymer Solids,”Jl. Sci. Res. Inst., 48 No. 1359, 154–165 (1954).
Hsiao, C. C., andSauer, J. A., “Effect of Strain Rate on the Tensile and Compressive Stress-Strain Properties of Polystyrene,”Bull. ASTM, No. 172, 25–35 (Feb. 1951).
Sachs, G., “Einfluz der Probenhöhe auf dem Strauchversuch,”Z. Metallkunde, Bd. 16, S. 55–58 (1924).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ito, K. Measurement of yield points of high polymers with resistance-wire dynamometer. Experimental Mechanics 1, 65–70 (1961). https://doi.org/10.1007/BF02322917
Issue Date:
DOI: https://doi.org/10.1007/BF02322917