1. |
On Generalized Torsional Flow |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 191-198
R. R. Huilgol,
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摘要:
This paper provides a derivation of the axial stress distribution and the total thrust in the generalized torsional flow of Pipkin and Tanner. A new interpretation of the formula in the inverted‐cone technique of Cowsley to find the second normal stress difference is also given, along with the use of a shallow spherical shell to find the normal stress differences.
ISSN:0148-6055
DOI:10.1122/1.549355
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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2. |
Structure of Thixotropic Suspensions in Shear Flow. III. Time‐Dependent Behavior |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 199-218
Howard A. Mercer,
Helmut D. Weymann,
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摘要:
The time‐dependent viscosity of bentonite‐water suspensions was studied experimentally in Couette flow for various transitions between constant shear rates. It was found that after a sudden change in the shear rate the time dependence of the viscosity can be described byη(t)=A exp[−(t/τ1)4.0]+B exp(−t/τ2)+C,withτ2>τ1.In general, the characteristic times: 1) become longer as the differences in shear rates become smaller; 2) decrease with increasing concentration; 3) show little temperature effect for a 20°C temperature change. A theory for the time‐dependent behavior is given which can reproduce the essential features of the experimental results.
ISSN:0148-6055
DOI:10.1122/1.549356
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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3. |
Biaxial Bond Stress Analysis in Peeling |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 219-235
D. H. Kaelble,
C. L. Ho,
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摘要:
A new instrument has been developed which permits direct measurement of the stress distribution functions for cleavage (normal stress) and shear (tangential stress) mechanisms of boundary fracture in peeling of viscoelastic material. The design theory, construction, and operation of the instrument are reviewed in detail. The influence of peeling angle upon the cleavage and shear stress distributions is investigated and analyzed. The results show that the cleavage and shear stress distributions correlate with different time scales of rheological response as predicted by available viscoelastic theory of fracture in peeling.
ISSN:0148-6055
DOI:10.1122/1.549333
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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4. |
Dynamic Response of Viscoelastic Solids in Liquid Media |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 237-245
Donald L. Maclean,
Takayuki Murayama,
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摘要:
A theoretical and experimental investigation of the dynamic mechanical properties of polymeric films in liquid media has been conducted. In an analytical development the effect of a viscous medium surrounding the specimen on the dynamic mechanical measurement is determined by calculating the viscous drag on the specimen which is subjected to a sinusoidal oscillation; this result is incorporated with the dynamic modulus analysis. The resulting expressions are demonstrated to predict the effective dynamic mechanical properties of films in liquid media by knowing the dimensions, viscosity, and density of the liquid and the frequency of oscillation. In order to separate the viscous drag from any polymer‐solvent interactions, a series of experimental studies using the Vibron instrument was conducted to measure the effective dynamic mechanical properties of films in a variety of noninteracting liquid media and dry conditions. The resultant dry measurements were used along with the theory to show the effect of viscous drag on the dynamic mechanical properties of a film in a liquid medium.
ISSN:0148-6055
DOI:10.1122/1.549334
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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5. |
An Experimental Study of the Kinematics of Flow Through Hoppers |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 247-269
Jannan Lee,
S. C. Cowin,
J. S. Templeton,
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摘要:
An experimental study of the kinematics of the gravity flow of granular materials through hoppers is presented. A radiographic technique was employed to determine simultaneously the velocity and porosity fields in a granular material flowing through a model hopper. It was found that the flow of granular materials through hoppers is characterized by regions of rigid body motion interspersed with narrow bands of drastic change in void ratio and velocity. A major conclusion of this study is that the kinematic assumptions employed in previous theoretical analyses of granular materials flowing through hoppers or in converging channels are not consistent with the salient kinematic phenomena observed. Knowledge of the kinematic phenomena detailed here is basic to the proper analysis and design of hoppers.
ISSN:0148-6055
DOI:10.1122/1.549335
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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6. |
Axial Stress in Elongational Flow of Fiber Suspension |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 271-285
T. E. Kizior,
F. A. Seyer,
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摘要:
Stress levels in elongational flow of suspensions of long fibers have been determined experimentally using a jet thrust apparatus. Stress levels for fibers with an axis ratio of 340 and a volume fraction of 0.001 exhibit stresses nearly an order of magnitude above values for a pure Newtonian fluid. A recent theory by Batchelor is shown to give the correct dependence of stress on axis ratio and concentration, but the predicted magnitude of stress is generally lower than the experimental values.
ISSN:0148-6055
DOI:10.1122/1.549336
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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7. |
Scale Effects in the Study of Earth Tides |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 287-297
I. J. Gruntfest,
H. R. Shaw,
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摘要:
Some new conceptions of the current condition of our planet emerge from analyses of the tidal motions of the earth which take into account the effect of scale on the mechanical behavior of materials. In particular, mechanisms for the production of earthquakes, volcanoes, and continental drift are suggested. The results are compatible with available data and suggest new observations and experiments which might be useful for earthquake prediction or for the discovery of geothermal energy sources.
ISSN:0148-6055
DOI:10.1122/1.549337
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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8. |
On High‐Frequency Behavior in Superposed Flow |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 299-312
I. F. MacDonald,
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摘要:
Parallel and orthogonal superposed flow results have been obtained experimentally. It has been found that at large values of the frequency of oscillation, the dynamic viscositiesηt′andηi′merge with the dynamic viscosity η′ for oscillatory shear alone and the storage moduliGt′andGi′become parallel to the storage modulusG′for oscillatory shear alone. Results are presented here showing that the conclusions by Bernstein, Huilgol, and Tanner that the K‐BKZ model correctly describes the high‐frequency asymptotic behavior are unwarranted and that, consequently, the predictive ability of the K‐BKZ theory for these flows remains unknown. The claim by Bernstein and Huilgol that the behavior of the Bird‐Carreau model is at variance with the experimental evidence is discussed and formal arguments are presented showing that the Bird‐Carreau and M‐OWFS model predictions do conform with the experimental data.
ISSN:0148-6055
DOI:10.1122/1.549362
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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9. |
On Low‐Frequency Behavior in Superposed Flow |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 313-322
I. F. MacDonald,
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摘要:
Certain low‐frequency asymptotic relations originally derived from the K‐BKZ model for parallel and orthogonal superposed flow are evaluated with experimental data and in terms of the predictions of six additional models. For orthogonal superposed flow, Tanner and Williams show that the data are consistent with the asymptotic relation, and it is shown here that all six additional models also predict this relation. For parallel superposed flow, the author's data are in conflict with the K‐BKZ model relation, and it is shown that only three of the additional models correctly do not predict this relation. These models (the Bird‐Carrreau model, the WJFLMB model, and the generalized pearl‐necklace model of Booij) also are the only models not to predict the general relation between the complex moduli for parallel and orthogonal superposed flow derived for the K‐BKZ theory by Yamamoto and Takano and by Bernstein. Analysis shows that the low‐frequency asymptotic relations jointly can be considered a special case of the general relation, and that, therefore, it is expected that the general relation will be rejected when parallel and orthogonal superposed flow data become available for the same fluids.
ISSN:0148-6055
DOI:10.1122/1.549338
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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10. |
Note: On the Rate‐Dependent Memory Function |
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Journal of Rheology,
Volume 18,
Issue 2,
1974,
Page 323-327
Mototsugu Sakai,
Hirokazu Kajiura,
Mitsuru Nagasawa,
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ISSN:0148-6055
DOI:10.1122/1.549357
出版商:The Society of Rheology
年代:1974
数据来源: AIP
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