Friction and Frictional Rise of Wedge Sliders on Rubber

1969 ◽  
Vol 42 (5) ◽  
pp. 1433-1445
Author(s):  
A. Schallamach
Keyword(s):  
Stress Distribution ◽  
Frictional Force ◽  
Surface Friction ◽  
Simple Theory ◽  
Photoelastic Investigation ◽  
Rubber Surface

Abstract The friction of wedge sliders on rubber depends surprisingly little on the angle between their leading faces and the rubber surface. Friction remains moderate even when this angle is 90°. A simple theory is put forward which accounts qualitatively for the observed limitation of the frictional force and which also predicts an experimentally verified lift of the sliders. In agreement with these findings, a photoelastic investigation of the stress distribution around the sliders reveals that no ramming pressure precedes them in the rubber. The absence of a ramming pressure is attributed to a forward tilt of the rubber which originates from the couple of the frictional force with respect to the undeformed rubber underneath.

The Theoretical and Photoelastic Investigation of Stresses in Chassis Frame Joints

1984 ◽  
Vol 198 (1) ◽  
pp. 63-68
Author(s):  
G H Tidbury ◽  
M S Alvi
Keyword(s):  
Stress Distribution ◽  
Plate Theory ◽  
Test Results ◽  
Classical Plate Theory ◽  
Channel Section ◽  
Photoelastic Investigation ◽  
The Cross ◽  
Theoretical Results

The high stresses in the joints of chassis frames subject to torsion are estimated theoretically and confirmed by tests on photoelastic models. The joints considered are between channel section cross members welded or continuously attached to the webs of channel section side members. The detailed stress distribution in the side members has been estimated using classical plate theory to find the forces resisting the warping displacements of the cross members. Models of joints and a complete frame were made from channel section castings of birefringement material and coated with reflective material to allow the use of a reflection polariscope to analyse the stress distribution. The theoretical results were compared with the results from approximate theories as well as with the photoelastic test results.

A study on mechanism of snow surface friction by paying attention to static frictional force

2017 ◽  
Vol 2017 (0) ◽  
pp. C-28
Author(s):  
Hiroyasu SAKANAGA ◽  
Hiroyuki OE ◽  
Hiroyuki KAGAWA ◽  
Kunio NIKKI ◽  
Osamu ABE
Keyword(s):  
Frictional Force ◽  
Surface Friction ◽  
Snow Surface

Stress concentration around a loaded bolt in an axially loaded bar

1968 ◽  
Vol 64 (4) ◽  
pp. 1215-1236 ◽  
Author(s):  
R. D Gregory
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Experimental Observation ◽  
Linear Equations ◽  
Numerical Results ◽  
Simple Theory ◽  
Infinite Systems ◽  
Systems Of Linear Equations ◽  
Axially Loaded ◽  
Elastostatic Problem

AbstractIn Part I of the paper, a simple theory of infinite systems of linear equations of the type L2 is presented. In Part II, these results are applied to the elastostatic problem of determining the stress distribution in an axially loaded bar, held in position by a centrally placed circular bolt. Some numerical results are obtained and these are compared with experimental observation.

Stresses in torispherical drumheads: A photoelastic investigation

1965 ◽  
Vol 1 (1) ◽  
pp. 69-82 ◽  
Author(s):  
H Fessler ◽  
P Stanley
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Elastic Stress ◽  
Yield Criterion ◽  
Uniform Stress ◽  
Stress Indices ◽  
Wide Range ◽  
Photoelastic Investigation ◽  
Bending Stresses ◽  
Von Mises

The dependence of the elastic stress distribution on the shape and thickness parameters in a wide range of torispherical drumheads has been examined using the photoelastic frozen-stress method. Peak principal stress indices are presented in the form of two contour systems; they have also been studied in terms of mean and bending stresses. An approximate approach to some of the practical problems of non-uniform stress gradients is suggested. Head distortions have been measured. A stress concentration factor based on the Maxwell-von Mises yield criterion is shown to be approximately equal to the conventional one.

Results of Photoelastic Investigation of Stresses in a Tension Bar with Unfilled Hole

1955 ◽  
Vol 59 (529) ◽  
pp. 64-65 ◽  
Author(s):  
H. T. Jessop ◽  
C. Snell ◽  
I. Jones
Keyword(s):  
Stress Distribution ◽  
Cross Section ◽  
Hole Diameter ◽  
Systematic Exploration ◽  
Photoelastic Investigation ◽  
The Cross

Although this problem is one which has been investigated by many photoelasticians, there appears to be no record of any systematic exploration of the effect upon the stress distribution of the ratio of hole–diameter to width of bar.In this investigation tests were made upon a standard sized bar with four different sizes of holes, and the stress distribution on the cross section of the bar through the hole centre was explored for the four cases.

Three-dimensional photoelastic analysis of pile caps

1996 ◽  
Vol 31 (1) ◽  
pp. 35-42
Author(s):  
P Krishna Iyer ◽  
C Sam
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Pile Spacing ◽  
Stress Components ◽  
Photoelastic Investigation ◽  
Pile Caps ◽  
Photoelastic Analysis ◽  
The Individual ◽  
Significant Bearing

This paper presents a three-dimensional photoelastic investigation of two- and four-pile caps for different depth—pile spacing ratios. For the analysis, the pile caps were idealized as rectangular blocks subjected to patches of loading at the column and pile locations. The individual stress components, their maximum values and locations were determined. Graphs showing the variations of important normal and shear stress components across depth, non-dimensionalized with the applied column stress, were given. On the basis of the results obtained it is concluded that the factors which are not hitherto considered in the design of pile caps have a significant bearing on the stress distribution.

The concerted use of SEM, TEM, and SCM for examination of resin-dentin interfaces

1994 ◽  
Vol 52 ◽  
pp. 476-477
Author(s):  
B. Van Meerbeek ◽  
L. J. Conn ◽  
E. S. Duke
Keyword(s):  
Surface Layer ◽  
Stress Distribution ◽  
Phosphoric Acid ◽  
Bonding Mechanism ◽  
Restorative Dentistry ◽  
Dental Adhesive ◽  
Low Viscosity ◽  
Dentin Adhesives ◽  
Acid Etch ◽  
Tooth Tissue

Restoration of decayed teeth with tooth-colored materials that can be bonded to tooth tissue has been a highly desirable property in restorative dentistry for many years. Advantages of such an adhesive restorative technique over conventional techniques using non-adhesive metal-based restoratives include improved restoration retention with minimal sacrifice of sound tooth tissue for retention purposes, superior adaptation and sealing of the restoration margins in prevention of caries recurrence, improved stress distribution across the tooth-restoration interface throughout the whole tooth, and even reinforcement of weakened tooth structures. The dental adhesive technology is rapidly changing. An efficient resin bond to enamel has already long been achieved. Its bonding mechanism has been fully elucidated and has proven to be a durable and reliable clinical treatment. However, bonding to dentin represents a greater challenge. After the failures of a dentin acid-etch technique in imitation of the enamel phosphoric-acid-etch technique and a bonding procedure based on chemical adhesion, modern dentin adhesives are currently believed to bond to dentin by a micromechanical hybridization process. This process is developed by an initial demineralization of the dentin surface layer with acid etchants exposing a collagen fibril arrangement with interfibrillar microporosities that subsequently become impregnated by low-viscosity monomers. Although the development of such a hybridization process has well been documented in the literature, questions remain with respect to parameters of-primary importance to adhesive efficacy.

Sign in / Sign up

Export Citation Format

Share Document