Contact Stresses

Contact Stresses

 

stresses arising from the mechanical interaction of solid deformable bodies in their areas of contact and in the vicinity of such areas—for example, during compression of bodies that are touching. A knowledge of contact stresses is important in calculating the strength of bearings, gear and worm drives, ball and cylindrical rollers, and cam mechanisms.

Contact stresses decrease rapidly with increasing distance from the area of contact. The distribution of contact stresses over the area of contact (see Figure 1) and in its vicinity is nonuniform and is characterized by large gradients. The maximum tangential stresses max, which to a large extent determine the strength of compressed bodies (for example, in the compression of spheres or intersecting cylinders), arise at a certain depth (point A) beneath the area of contact. The stress state in the immediate vicinity of this area is close to hydrostatic compression, for which tangential stresses are known to be absent.

Figure 1. Stress distribution upon compression of spherical bodies: ( P ) compressive force, ( R1 ,) and (R2) radii of the spheres, ( p0 ) maximum stress in the center of the area of contact S, (p) stress at distance r from the center of the area of contact, (a) radius of area of contact, (A) point of maximum stress

References in periodicals archive ?
Lee and coworkers performed a cadaveric biomechanical study looking at contact stresses in the medial compartment after serial meniscectomy.
Under certain ratio of physical and geometrical parameters of the sheet element and heat source, in the sheet element there will arise contractive stresses, zones where the slot will make a contact at some area and at this area of slot faces there will arise contact stresses.
Introducing Improved Loading Assumptions into Analytical Pavement Models Based on Measured Contact Stresses of Tires, in The International Conference on Accelerated Pavement Testing, Reno, NV, 1999.
A big Surface area is formed in comparative contact; as a result, contact stresses decrease.
As a result, antifriction coatings are used for machinery lubrication, general metal lubrication in cutting tools, dies, and forming tools, and for gears operating under high contact stresses or pressures.
What we found instead was that the change in contact stresses was highly variable.
The contact stress at different position of the roller is different, averaging the contact stresses along the contacting limit, the average contact stress is:
The main aim of this study is to compare the contact stresses developed on UHMWPE polymer cup surface due to two different activities.
the influence of the tire type, where the stress and strain conditions near the surface of the pavement are strongly influenced by the contact stresses and their distribution in the tire-pavement interface, whereas the stresses and strains deeper in the structure are mainly influenced by the total load.
Among the topics are a method for implementing a ramp simulation of a rail vehicle, the performance of aloe fiber and pure yarn, a self-cleaning method for a large solar cell array based on traveling-wave dielectrophoretic force, the finite element analysis of contact stresses in a pure rolling ceramic ball, the multi-point spraying of a central air-conditioning system, the wearability of coconut carbon fiber knitted fabric, the design of a mine production safety monitoring system, and measuring and analyzing coal slime yield stress.
A study of subsurface rail/wheel contact stresses with application to modelling rail fatigue, in Proceedings of the 2nd Symposium on Contact Mechanics and Wear of Rail/Wheel Systems, 421-434.
This incongruity of the joint surface and resulting cartilage damage often alters contact stresses in the ankle joint and can likely lead to development of painful cysts deep within the bone.