A Criterion for the Constancy of the Gage Factor of SR-4 Type Strain Gages

1956 ◽  
Vol 23 (3) ◽  
pp. 474-476
Author(s):  
G. C. Kuczynski
Keyword(s):  
Type Strain ◽  
Experimental Results ◽  
Strain Gages ◽  
Theoretical Conclusion ◽  
Gage Factor

Abstract It has been shown that the criterion of the gage-factor constancy of SR-4 type strain gages is that it is equal to 2 or nearly so. The experimental results agree with this theoretical conclusion.

A Comparison of Theoretical and Experimental Results From Spherical Shells With a Single Radially Attached Nozzle

1967 ◽  
Vol 89 (3) ◽  
pp. 333-338 ◽  
Author(s):  
F. J. Witt ◽  
R. C. Gwaltney ◽  
R. L. Maxwell ◽  
R. W. Holland
Keyword(s):  
Spherical Shell ◽  
Internal Pressure ◽  
Experimental Results ◽  
Strain Gages ◽  
Spherical Shells ◽  
Axial Thrust ◽  
Outside Diameter ◽  
Theoretical Results

A series of steel models having single nozzles radially and nonradially attached to a spherical shell is presently being examined by means of strain gages. Parameters being studied are nozzle dimensions, length of internal nozzle protrusions, and angles of attachment. The loads are internal pressure and axial thrust and moment loadings on the nozzle. This paper presents both experimental and theoretical results from six of the configurations having radially attached nozzles for which the sphere dimensions are equal and the outside diameter of the attached nozzle is constant. In some instances the nozzle protrudes through the vessel.

On the Mechanics of Wire Drawing

1961 ◽  
Vol 83 (4) ◽  
pp. 523-529 ◽  
Author(s):  
C. T. Yang
Keyword(s):  
Theoretical Analysis ◽  
Shear Deformation ◽  
Coefficient Of Friction ◽  
Close Agreement ◽  
Wire Drawing ◽  
Experimental Results ◽  
Strain Gages ◽  
Drawing Force ◽  
The Coefficient Of Friction ◽  
Wire Resistance

Split-die technique was adopted to find the coefficient of friction in wire drawing directly from experiment. Simple dynamometers with wire resistance strain gages were used for measuring separating force and drawing force instead of cumbersome equipment used by former researchers. Reasonably good results were obtained. The effect of the land or parallel portion in the die on the coefficient of friction was indicated in the results. Its importance was emphasized. A theoretical equation of the drawing stress with the effect of land considered was derived. Using the coefficient of friction obtained by the split-die method, drawing stresses were calculated from the derived equation. A comparison of the theoretical and experimental drawing stresses was made. Results were tabulated and plotted. It was concluded that including the land in the analysis of wire drawing is important and further research in analyzing the shear deformation must be pursued in order to get a close agreement between theoretical analysis and experimental results.

Elastic-Plastic Stress Distribution in a Compressed Ring

1968 ◽  
Vol 90 (4) ◽  
pp. 435-440
Author(s):  
K. T. Chang ◽  
P. M. Leopold
Keyword(s):  
Stress Distribution ◽  
Strain Curve ◽  
Experimental Results ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Strain Gages ◽  
Stress Strain ◽  
Theoretical Predictions ◽  
Strain Relationship ◽  
Plastic Stress

This investigation was conducted to define the plastic stress distribution at a section 90 degrees from the point of load application on a ring. The elastic and plastic stress distribution was determined experimentally by using postyield strain gages and the stress-strain relationship obtained from a uniaxial tensile test. The experimental results in the elastic range were found to agree with presently available theoretical predictions. A theoretical plasticity analysis of the ring was made by assuming that it deforms to the shape of an ellipse and that plane sections remain plane. The strains determined in this manner were used to calculate stresses off the tensile stress-strain curve. The experimental results indicated that this initial analysis gave a good approximation of the stress distribution for large deflections of the ring.

XXV.—Inversion Temperatures, and the Form of the Equation of State.

1908 ◽  
Vol 28 ◽  
pp. 394-399
Author(s):  
W. Peddie
Keyword(s):  
Equation Of State ◽  
Kinetic Energy ◽  
Initial Pressure ◽  
Experimental Results ◽  
Porous Plug ◽  
Theoretical Conclusion ◽  
Appreciable Difference ◽  
Inversion Temperature ◽  
Possible Cause

1. RECENT experiments by Olszewski on hydrogen (Phil. Mag., May 1902), and on air and nitrogen (Phil. Mag., June 1907), have exhibited results which are not in accordance with theoretical deductions based upon Van der Waal's equation of state (Dewar, Proc. Roy. Soc, March 1904; Porter, Phil. Mag., April 1906; Hamilton Dickson, Phil. Mag., January 1908). An inversion temperature is not necessarily limited by the condition, which was satisfied in the porous-plug experiment of Joule and Kelvin, that the initial and final pressures should be nearly equal. In Olszewski's experiments that condition was widely departed from. Taking account of large differences of pressure, Dickson shows that Van der Waal's equation leads to the result that the inversion temperature must fall when the initial pressure increases, the final pressure being kept constant. Olszewski's experimental results are opposed to this conclusion; and Dickson suggests, as a possible cause of the discrepancy, an appreciable difference between the initial and final values of the kinetic energy. The following reasoning seems to indicate that such a difference would not alter the nature of the theoretical conclusion.

scholarly journals Influence of the binder filtration on residual stresses at the composite constructions manufacturing

2018 ◽  
Vol 251 ◽  
pp. 04053
Author(s):  
Andrei Sergeev ◽  
Robert Turusov ◽  
Arkadiy Gorenberg ◽  
Alexandr Kuperman
Keyword(s):  
Residual Stresses ◽  
Experimental Results ◽  
Strain Gages ◽  
Fibrous Filler ◽  
Stress Changes ◽  
Processing Material

Stress changes generated during the composite winding on the mandrel surface is investigated. A model of liquid binder filtration through the fibrous filler in the form of disc-shaped gap in the structure of the coil-processing material is proposed. An equation, considering the stress decrease occurring in consequence of the coils winding due to binder filtration is suggested. Experimental results of unidirectional rings winding on mandrels studied using strain gages are demonstrated.

Comportement thermique et mécanique du béton de masse au jeune âge

1996 ◽  
Vol 23 (6) ◽  
pp. 1199-1206
Author(s):  
N. Bouzoubaâ ◽  
M. Lachemi ◽  
P.-C. Aïtcin ◽  
B. Miao
Keyword(s):  
Numerical Models ◽  
Autogenous Shrinkage ◽  
Concrete Block ◽  
Experimental Results ◽  
Mass Concrete ◽  
Strain Gages ◽  
Concrete Element ◽  
Shrinkage Temperature ◽  
Massive Concrete ◽  
Good Agreement

The paper presents the main results obtained from experimental and numerical investigations of the thermal and mechanical behaviors observed during curing of a massive concrete element made with type 20M cement. An experimental concrete block 920 mm in diameter and 1000 mm in thickness was instrumented with thermocouples and vibrating-wire strain gages in order to monitor the early age behavior of mass concrete. A numerical model was used to predict the temperature field that occurs in the concrete element upon hydration of cement. The modeling of the mechanical behavior was achieved using a law that accounts for autogenous shrinkage. The experimental results illustrate the importance of selecting the type of cement for use in mass concrete. The data provided by the numerical models are in good agreement with the experimental results. Key words: dam, mass concrete, deformation, finite elements, thermal gradient, instrumentation, autogenous shrinkage, temperature. [Journal translation]

An Experimental and Numerical Study of Elastic Strain Waves on the Center Line of a 6061-T6 Aluminum Bar

1972 ◽  
Vol 39 (2) ◽  
pp. 367-371 ◽  
Author(s):  
J. L. Habberstad ◽  
K. G. Hoge ◽  
J. E. Foster
Keyword(s):  
Experimental Data ◽  
Outer Surface ◽  
Elastic Strain ◽  
Numerical Study ◽  
Experimental Results ◽  
Center Line ◽  
Two Dimensional ◽  
Strain Gages ◽  
Strain Waves ◽  
The Impact

The elastic strain waves resulting from the impact of two 3/4-in-dia 6061-T6 aluminum bars are studied experimentally and analytically. Experimental data are obtained from strain gages on the center line and outer surface of the bar, located at various distances from the impact end of the bar. Experimental data are compared to numerical results obtained from integrating the exact equations of two-dimensional motion. In general, agreement between the numerical and experimental results is very good.

Residual Stresses Measurements Using Strain Gages - Aluminum Wheels

2012 ◽  
Vol 727-728 ◽  
pp. 1925-1930 ◽  
Author(s):  
F.C. Cione ◽  
J.L. Rossi ◽  
A.C. Souza ◽  
S. Delijaicov ◽  
M.A. Colosio
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Residual Stresses ◽  
Type Strain ◽  
Stress Fields ◽  
Strain Gages ◽  
Principal Stresses ◽  
Drilling Method ◽  
Fea Simulation ◽  
Operational Criteria

Many engineering specifications, manufacturing procedures, inspection and quality control have begun to require that the residual stress of a particular component be evaluated. This is becoming as commonplace as the demands on the mechanical properties. In the country there are few research laboratories qualified to perform these tests and also found a worrying lack of skilled labor. Studying the formation and distribution of residual stress fields will improve the operational criteria of wheel safety, among other gains. It is known that these residual stress fields could be added to the effects of system load (tare weight plus occupation of vehicle traction, braking and torque combined). The results obtained used drilling method and rosette type strain gages, are convergent with similarity to those obtained using FEA simulation over critical region for global and superficial in principal stresses mode. The relevance of the present study and research on residual stresses meets safety improvements in cars wheel industry.

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