These findings have led to a new understanding of stick slip phenomena in boundary lubrication 17 and have revealed the sensitivity of liquid spreading to microstructure at the liquidsolid. Stickslip vibrations, shooting method, dry friction, discontinuous systems. Let the strain gauge be moving with a constant velocity v. Pulsations the inside surface when very cold ibc air is used, but this is rare. In this process, the main aspects related to friction are discussed, with particular. Representation of stick slip motion the scratching model described above is a periodic slip model. They may form as a result of tensile fracture at depth in front of plowing asperities that is not necessarily dependent on stick slip. Earthquakes have long been recognized as the result of stick slip frictional instability 164171.
Earthquakes as a selforganized critical phenomenon per bak and chao tang brookhaven national laboratory, upton, new york. Dynamic model of an oilwell drillstring with stickslip and bitbounce interaction. Experimental verification of the mechanisms causing stick. One of the most beautiful sounds to many people is that produced by bowing a. Fault and system stiffnesses and stickslip phenomena. John%20macpherson%20%20stick%20slip%20presentation. A survey and comparison of several friction force models. Stick slip phenomena and the associated noise are the result of selfexcited oscillations related to the difference between static and sliding friction. Pdf in the present study, we investigate the stickslip phenomenon and friction behaviour of industrial ball bearing linear guides to get some. Previousstudies11haveusedacoustic emissions ae measured in the near field around the contact to detect the onset of slipping in a tensile test machine.
Slow slip and the transition from fast to slow fronts in the. This communication presents an overview of friction modelbuilding, which starts from the generic mechanisms behind friction to construct models that simulate observed macroscopic friction behaviour. Molecular dynamics simulations are performed to investigate the atomicscale stick slip phenomenon of a pyramidal diamond tip inserted into the ag010 surface. Much of the research on instabilities in the past decade has been concerned with the relation. To represent our understanding of friction in nonlinear dynamics, we first trace examples from the earliest prehistoric technologies and the formulation of dissipation laws in mechanics.
Predicting the size of stickslip events utrecht university repository. The oil of the sandvik oh32a show a very good filterability. Earthquakes have long been recognized as the result of stickslip frictional instability 164171. Since pdf files entered the it world, a lot of things changed to benefit from them. On the use of ultrasound waves to monitor the local. One of the approaches to detect stick slip relies on the sound waves generated by the frictional energy dissipation attheinterface. Another, more common example which produces sound using stickslip friction is the grasshopper. Material selection and coatings are two important factors to consider in dealing with friction when designing pass through seals for endoscopic trocars. Timeresolved studies of stickslip friction in sheared. Stickslip can also be observed on the atomic scale using a friction force microscope. The tension in the drillpipes avoids buckling of the drillpipe section. One animal that produces sound using stickslip friction is the spiny lobster which rubs its antennae over smooth surfaces on its head.
Frictional motions in general are described as stick slip phenomena. Stickslip phenomenon an overview sciencedirect topics. Experimental verification of the mechanisms causing stickslip motion originating from relative deceleration. Modeling of stick slip phenomena using molecular dynamics. This study is aimed at examining and comparing several friction force models dealing with different friction phenomena in the context of multibody system dynamics. Experimental evaluation of brake pad material propensity. Understanding slip perception of soft fingertips by modeling and. An accurate contact modeling of such systems requires knowledge of interface contact parameters 18 such as contact sti ness, which are not. Some striae become progressively deeper and wider downglacier and then end abruptly, similar to some fault striae that have been linked to stick slip phenomena. An earthquake is a natural phenomenon that is caused by sudden accelerating slip on a fault. In sum, many researchers and scholars have seen many phenomena related to the chaotic stick slip vibrations of the brake system under different friction models through tangential vibration model.
Moving to the nanoscale changes the contact mechanics which govern. Pdf stickslip motion is the basis for the description of a great variety of phenomena characterized by the presence of sliding friction between. Stabilization and analysis of stick slip phenomena in oildrilling facilities introduction the modelling and dynamical study of oil drilling systems has been the subject of an active investigatin by a wide community for several decades. The work culminates with examples of friction oscillators and stick slip. Stickslip motion, regarded as a model of earthquake generation, has been the subject of intense investigations for a long time. Analysis of squeal noise and mode coupling instabilities including damping and gyroscopic effects european journal of mechanics asolids. Hysteresis phenomena in the stickslip motion at the. Pfe master 2 internship stabilization and analysis of. The development of the constitutive law of rock friction illustrates that many earthquake phenomena. How to measure, prevent, and eliminate stickslip and. This phenomenon, which is characteristic of flow of melts and concentrated solutions at high shear stresses, is called the stick slip phenomenon.
It is found that at sufficiently high stresses the capillary flow characteristics are largely dictated by the stick. The stick slip vibrations, the primary cause of which lies in the form of the wheel rail friction and traction force characteristics, occur at low slide speeds, generally at the start of the. Occurrence of stickslip phenomenon jan awrejcewicz. Stick slip vibration induced by dry friction force occurs in all mechanical systems with relative motion on their contacting surfaces. The stickslip process, as all integrateandfire phenomena, is highly sensitive to a weak external. In basic lubrication courses, stickslip is often a difficult concept to explain. The sliding contact between a soft indenter and rigid floor was experimentally investigated to find stickslip phenomena and the induced force of. Slip may not necessary occur continuously, it may alternate with adhesion. Stick slip phenomena occurring in solid friction are ubiq uitous in real. This is due to a temporary disruption of the surface of the adhesive upon removal of the liner. The development of the constitutive law of rock friction illustrates that many earthquake phenomena are all attributed to the manifestations of friction law.
Combining equations 9 and 10 and substituting in equation 8, we have. In this case, the corresponding mechanism of motion in channel proves to be unstable see section 3. Merge pdf files together taking pages alternatively from one and the other. Merge pdf files, select the pages, merge bookmarks and interactive forms. We present results of a study on the stick slip phenomenon observed for two linear polyethylenes hdpe and lldpe. Earthquakes have long been recognized as resulting from a stick slip frictional instability. Selected detergent dispersant dd additives guarantee excellent cleaning properties and sludge carrying capacity. Gresham contributing editor people dont often talk about stick slip in every day conversation, even among us tribologically oriented folks. The mechanisms behind the stick slip events are investigated by considering sliding speeds between 1. The perfect tool if you have a singlesided scanner. Business reports, emails, invoices, ebooks and even personal documents became influenced by this new file format. Stick slip whirl interaction in drillstring dynamics 3 drill bit drill pipe drill collars compression stabilisers ension mud in mud out figure 2. Since the ostrator was built for showcase purposes, it has to be piloted in and out stick.
The haze will rapidly dissipate within minutes or upon heating and will not interfere with optical applications. In literature, the nonsmooth system possessing this kind of motion is often modelled by a discretized chain of blocks. Slip stick effect an overview sciencedirect topics. Consequently, spragslip and to a greater extent mode coupling instabilities due to the intrinsic structure of the system are more likely to be responsible for this phenomenon. Distinct stickslip modes in adhesive polymer interfaces. Mechanisms of sliding friction studied with an array of. Whats more, specifying the correct material and coating can reduce. In recent years, a new type of drilling technology, torsional impact drilling, has been developed to mitigate the stick slip phenomena, particularly in the drilling of deep or abrasive formations.
Be it in industry, mechanics or applied mathematics, these sys. A study of the stickslip phenomenon in singlescrew. Pdf what we can learn about stickslip dynamics researchgate. Pdf experimental investigations on stickslip phenomenon and.
This communication presents an overview of friction modelbuilding, which starts from the generic mechanisms behind friction to construct. A critical shear stress near the exit, in conjunction with a critical acceleration, results in skin rupture of the extrudate 15,16. A general boundary condition for liquid flow at solid. Stickslip, manifest as intermittent tangential motion between two solids, is a wellknown. However, none of those ever did researches about chaotic vibrations through. The development of a full constitutive law for rock friction now shows that the gamut of earthquake. In this case the assumption of a purely tribological origin appears unrealistic. Slip stick makes the cello beautiful and the squeaky door annoying. Measurements of stick slip and static friction ziegler stick slip test rig to examine lubricants according to their stick slip behaviour, the stick slip test rig ssp from ziegler instruments is used. During this slip energy is released in the form of seismic waves. The mathematica journal using the logistic map to generate. Such phenomena are related to an unstable vibrational response of the frictional system, due to the coupling between the system dynamics and the transient behavior at the frictional interface 16,17,19. Pdf on the stickslip phenomena in traction railway vehicles. Stickslip vibrations induced by alternate friction models.
The present study focuses on molecular characteristics and temperature dependence of a superfluidlike stick. Split a pdf file at given page numbers, at given bookmarks level or in files of a given size. Also, they analyzed the stability around 34 rpm and 161 kn, as well. Timeresolved studies of stick slip friction in sheared granular layers s. In the stick phase, the two surfaces are not in motion and are held in. Effects of brake pressures on stickslip bifurcation. A polymer is pressed on a plate which can be made of steel or a polymer which makes an oscillating movement. A novel static fric tion force model for both positive and negative velocities of the base is proposed. Two polyethylenes, a linear and a longchain branched sample, were compared in order to get an insight into the influence of branching on stick and slip phenomena.
In short, friction is one of the main players in a wide variety of mechanical systems. Here we combine both 2d elastodynamics and timedependent friction. Since the spring is tensioned in the stick phase and relieved in the subsequent slip phase, the friction pair belt and mass m will always attain a maximum relative speed that is higher than the speed of the belt v. Stickslip is generally a dynamic cyclic process where two mating surfaces oscillate between a stick phase and a slip phase. Adolix split merge pdf free pdf combine, append pdf.
A 2 dof nonlinear dynamical system with dry friction. Rapidly oscillating friction forces occurring during a portion of the orbital cycle. The current discussion focuses shortly on the dynamic phenomena. Sandvik oh32a oil is produced with zinccontaining additive systems. The piezoelectric sensors can detect radiated waves just a few pm in amplitude in the frequency.
660 59 1596 1552 134 1143 892 316 1388 1637 1447 665 325 79 1498 594 1106 1638 227 1471 193 937 241 162 1035 1366 1274 571 1554 1388 329 1219 1154 194 170 861 1017 1305 366 1387 852 7 181