Download PDF by Richard L. Pendleton (auth.), Richard L. Pendleton, Mark E.: Manual on Experimental Methods for Mechanical Testing of

By Richard L. Pendleton (auth.), Richard L. Pendleton, Mark E. Tuttle (eds.)

ISBN-10: 9400911297

ISBN-13: 9789400911291

ISBN-10: 9401070008

ISBN-13: 9789401070003

References Liquid-metal pressure gages might be fabricated in both unmarried- or delta-rosette configurations. Their major benefits are their low stiffness (essential for 1. Beatty, M.F. and Chewning, S. W., "Numerical research of the Reinforcement impact of a pressure Gage utilized to a smooth use on composites with gentle, elastomeric matrices) Material," Int. J. Eng. Sci., 17, 907-915 (1979). and excessive elongation (at least 50 percent). Their prin­ 2. Pugin, V.A., "Electrical pressure Gauges for Measuring huge cipal negative aspects are a brief shelf lifestyles and a Deformations," Soviet Rubber undefined, 19 (1), 23-26 (1960). nonlinear calibration curve. three. Janssen, M.L. and Walter, J.D., "Rubber pressure Measurements in Bias, Belted Bias and Radial Ply Tires," J. covered Fibrous Mat., 1, 102-117 (1971). four. Patel, H.P., Turner, J.L., and Walter, J.D., "Radial Tire Cord-Rubber Composite," Rubber Chem. and Tech., forty nine, Acknowledgments 1095-1110 (1976). five. Stone, J.E., Madsen, N.H., Milton, J.L., Swinson, W.F., and Turner, J.L., "Developments within the layout and Use of Liquid-Metal pressure Gages," EXPERIMENTAL MECHANICS, 23, the writer recognizes necessary feedback by means of 129-139 (1983). Dr. Joseph D. Walter of Firestone important examine 6. Whitney, R.J., "The dimension of quantity adjustments in Human Limbs, " J. body structure, 121, 1-27 (1953).

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Extra resources for Manual on Experimental Methods for Mechanical Testing of Composites

Example text

Alternatively, the products F.. A.. and F,A. can be viewed as the effective axial and transverse gage factors applicable to the same conditions. It is assumed that A.. and A. are independent of the strain level, and are functions only of gage proportions and the ratio EI/E" where Ei is the relevant elastic modulus of the test material, and E, the 'equivalent modulus' of the gage. In the case of a metal test member, with negligible reinforcement, both coefficients must closely approach unity in order that eq (2) effectively revert to eq (1).

This is accomplished by selecting a strain gage alloy (generally constantan or Karma) which has been processed to present a nearly zero output in response to temperature variations when mounted to a material whose coeffecient of thermal expansion matches the S-T-C number of the gage. Figure 3 shows apparent-strain curves generated by typical commercially available constantan and Karma gages mounted on steel. As shown, reasonably accurate apparent-strain compensation is achieved over the range of approximately -20 to + 205 0 C (0 to 400 oF).

Perry, C. , "Plane Shear Measurement with Strain Gages, " EXPERIMENTAL MECHANICS. 9 (1), 19N-22N (Jan. 1969). (Measurements Group Tech Note TN-512). 44 Section IIiF Normal-Stress and Shear-Stress Gages and Rosettes· by Charles W. Bert ture of the composite (say the fiber diameter) that the composite may be assumed to be macroscopically homogeneous, although orthotropic with respect to the fiber direction (see Section IIA on 'AnisotropicMaterial Behavior'). , the stress and strain tensors are assumed to be symmetric.

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Manual on Experimental Methods for Mechanical Testing of Composites by Richard L. Pendleton (auth.), Richard L. Pendleton, Mark E. Tuttle (eds.)


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