Furthermore, it was found that there exists the chatter phenomena induced by dry friction in low frequency, and the windows of chaotic motion are broadened in the area of higher excitation frequencies as the dry friction increases. Centre automatique et systmes, mines paristech, 60, bd stmichel, 75272 paris, cedex. Atomistic simulation of stickslip behaviour youtube. In the context of adhesive polymer interfaces, this phenomenon has often been solely associated with schallamach waves, which are termed slow waves due to their low propagation speeds.
Correlation between nanosecond xray flashes and stickslip. For the longchain branched polyethylene, velocity profiles were obtained which do not give any indication to wall slip in the. Stickslip definition is movement of two surfaces relative to each other that proceeds by a series of jerks caused by alternate sticking from friction and sliding when the friction is overcome by an applied force. The force and displacement resolutions of the experimental system were as high as 0. Molecular instabilities in capillary flow of polymer melts. Hysteresis phenomena in the stickslip motion at the boundary. Stickslip behaviors in both deterministic and random cases are obtained through simulation and compared. The equations for the sliding of a single block driven by an elastic force show numerically a fast and a slow step in their dynamics when a dimensionless parameter is very large, a limit pertinent for many applications. Below is a simple, heuristic description of stick slip phenomena using classical mechanics that is relevant for engineering descriptions. In the automotive industry, brake noise is gaining lot of concern and thus has led to extensive research in this field.
There is a transition from stickslip to a closely smooth motion for the sis films with increasing ps content. The effect of laser surface texturing to inhibit stick. Department of mechanical engineering, bms college of engineering, bengaluru, india. The results showed that the system possesses rich dynamics characterized by periodic motion, stick slip impact motion, quasiperiodic motion and chaotic attractors, and the routs from periodic motions to chaos observed via hof. The development of a full constitutive law for rock friction now shows that the gamut of earthquake. However, in actuality, there is little consensus in academia regarding the actual physical description of stick slip which follows the lack of understanding about friction phenomena in general. The stickslip phenomenon is simply described as a simple contact model which is a rigid body. In this case, the corresponding mechanism of motion in channel proves to be unstable see section 3. Stick slip phenomena also emerge in the manybody disk model. Stickslip definition of stickslip by merriamwebster. Slip may not necessary occur continuously, it may alternate with adhesion. 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. Measurements of stickslip and static friction ziegler stickslip test rig to examine lubricants according to their stickslip behaviour, the stickslip test rig ssp from ziegler instruments is used.
This article summarizes our recent experimental studies of an important class of polymer melt rheological phenomena including flow instabilities, stick. Driving forces are assigned with two functions,one appropriate for comparison with the test and the other to study stickslip orbits, which have been found to have various types of motion depending on the controlling brake actuation parameters. Downloaded from sae international by jan zuleeg, sunday, june 21. It was found that the stickslip phenomenon in the liquid nitrogen was significant, while the slope of the stickslip was larger than those observed in the air and water media. Stickslip occurs in many situations where frictional excitation is present, for example a violin bow acting on the string. Stick slip definition is movement of two surfaces relative to each other that proceeds by a series of jerks caused by alternate sticking from friction and sliding when the friction is overcome by an applied force. Modeling of stick slip phenomena using molecular dynamics this item was submitted to loughborough universitys institutional repository by thean author. The mechanism of stickslip phenomenon during friction. Stickslip mitigation option tree highsevere stickslip 1 pdc bit 4 increase mud 2 bha 3 drilling parameters lubricity more bladessmaller cutters increase cutter backrake angle depth of cut limitershybrids use insert bit drop flex collar undergauge stabilizers 18 to 116 integral blade or melonprofile stabilizers drop.
Stick slip, manifest as intermittent tangential motion between two solids, is a wellknown friction instability that occurs in a number of natural and engineering systems. Periodic oscillations of the flow behavior, typical of a stickslip phenomenon, are also observed when shear localization occurs. Pdf on the stickslip phenomena in traction railway vehicles. Stickslip dynamics of migrating cells on viscoelastic substrates. It can be seen that the suppression effects of the stick slip phenomenon of s2 and s5 samples are mainly due to the lubricating oil film when the upper and lower samples move relatively to each other. Chatelet, eric and michon, guilhem and manin, lionel and jacquet, georges stickslip phenomena in dynamics. Stickslip phenomenon in measurements of dynamic contact angles and surface viscoelasticity of polystyrenebisoprenebstyrene triblock copolymers. Identification and quantification of stickslip induced. Slow earthquakes, preseismic velocity changes, and the. The effect of laser surface texturing to inhibit stickslip. Experimental investigation of the stickslip phenomena of. Stickslip often accompanies frictional sliding in laboratory experi ments with geologic materials. Stickslip, also referred to as stiction, is the bane of engineers and machine builders who need smooth, precise motion.
Driving forces are assigned with two functions,one appropriate for comparison with the test and the other to study stick slip orbits, which have been found to have various types of motion depending on the controlling brake actuation parameters. Experimental investigation of the stickslip phenomena of the. A manybody disk model of slip phenomena and disk contact. Modeling of stick slip phenomena using molecular dynamics. Slipstick makes the cello beautiful and the squeaky door annoying. How to measure, prevent, and eliminate stickslip and. The stickslip phenomenon, also known as the slipstick phenomenon or simply stickslip, is the. The present study investigates the characteristics of stickslip phenomena of the drill pipe with the model experiments and numerical methods. Stickslip phenomenon an overview sciencedirect topics. The occurrence of stickslip phenomenon article pdf available in journal of theoretical and applied mechanics 451. Fault and system stiffnesses and stickslip phenomena.
Therefore, a greater influence can be made on the stickslip phenomenon by the amount of the lubricating oil. Stickslip motion, a common phenomenon observed during crawling of cells, is found to be strongly sensitive to the. Using a finite element model, this paper investigates the stickslip behavior of a drill string subjected to both deterministic excitation and random excitation. However, during stickslip, the frictional force does not remain constant, but rather oscillates. The development of the constitutive law of rock friction illustrates that many earthquake phenomena are all attributed to the manifestations of friction law. Apr 01, 20 stickslip phenomena in the friction of human skin stickslip phenomena in the friction of human skin derler, s rotaru, g. The stickslip is one of the critical problems for the scientific drilling, because it causes a crushing of the sampled layer. Such a model can well explain the occurrence of stickslip phenomenon. The mechanisms behind the stickslip events are investigated by considering sliding speeds between 1. A manybody disk model of slip phenomena has 1 f fluctuation that is one of the most exciting topics in nonlinear physics c laeys and s imoen, 1997. Stickslip phenomena in the friction of human skin, wear 10. Stickslip whirl interaction in drillstring dynamics this paper attempts to explain the complicated behavior of oilwell drillstring motion when both torsional stickslip and lateral whirl vibration are involved.
Analysis and simulation of clutch engagement judder and. Study of friction induced stickslip phenomenon in a minimal disc brake model. This stickslip phenomenon can occur if the coefficient of static friction is much greater. Sep, 20 while the character of slow earthquakes has been approximated for some time, precise slip histories and the underlying mechanisms have remained elusive. The stickslip vibration and bifurcation of a vibroimpact system with dry friction.
The stick slow part takes place along a slow manifold in the. Pdf the effect of laser surface texturing to inhibit. An asymptotic analysis of the solutions explains well the two sharply different steps of the stick slip dynamics. The present study investigates the characteristics of stick slip phenomena of the drill pipe with the model experiments and numerical methods.
How to measure, prevent, and eliminate stickslip and noise. The mechanism of stickslip phenomenon during friction process at. Stickslip phenomenon in measurements of dynamic contact. Modeling of stickslip phenomena using molecular dynamics. Distinct stick slip modes in adhesive polymer interfaces. Simply put, its the jerkiness that can plague both plain and recirculating linear bearings when they transition from standstill to motion. Earthquakes have long been recognized as resulting from a stickslip frictional instability. The work culminates with examples of friction oscillators and stick slip. Influence of spring constant on stick slip behaviour static friction in the previous section, the negative slope of the stribeck curve was. Stick slip often accompanies frictional sliding in laboratory experi ments with geologic materials. Read a general approach to discontinuous transfer films. Hysteresis phenomena in the stickslip motion at the. Stickslip phenomena also emerge in the manybody disk model.
However, in actuality, there is little consensus in academia regarding the actual physical description of stickslip which follows the lack of understanding about friction phenomena in general. Below is a simple, heuristic description of stickslip phenomena using classical mechanics that is relevant for engineering descriptions. We note that although our data clearly show stickslip motion, our peel speed of 3 cm s1 is much lower than that referred to in the literature as the stickslip regime for peeling pressure. Stick slip and vibration mitigated while drilling by the use of ast from tomax as duration. An asymptotic analysis of the solutions explains well the two sharply different steps of the stickslip dynamics. Slip stick motion and the impact of system motions were analyzed and numerical simulations were also carried out. Slow earthquakes, preseismic velocity changes, and the origin. Both results are discussed in the light of various theoretical models for soft glassy materials. A polymer is pressed on a plate which can be made of steel or a polymer which makes an oscillating movement.
During the stick stage of stick slip motion, the block is fixed and the spring elongation expresses the storage of elastic energy. Friction is closely associated with the stickslip phenomenon. Also appropriate stiffnesses are suggested for an earthquake sequence modeled as a growing dislocation. In conjunction with shear load stiffness, the normal load stiffness, often neglected, is shown to have a considerable effect on the stick slip process its presence or absence and its characteristics.
The analysis of the dynamic features of the substrate shows that. Pdf the occurrence of stickslip phenomenon researchgate. When a material is immersed in a lowtemperature medium, e. Stick slip as a mechanism for earthquakes abstract. An algorithm for modelling stickslip is developed and is used in numerical simulations which show that the likelihood of stickslip is increased by clutch pressure fluctuations, judder approaching engagement, and external torque fluctuations. However, the slip time is prolonged as temperature of the system increases, for example, ratios of about 9. The pdf of the stickslip response in the phase plane is also obtained. Study of friction induced stickslip phenomenon in a. Stickslip phenomena in the friction of human skin stickslip phenomena in the friction of human skin derler, s rotaru, g.
Molecular dynamics simulations are performed to investigate the atomicscale stickslip phenomenon of a pyramidal diamond tip inserted into the ag010 surface. Identification and quantification of stickslip induced brake. Dec 01, 2016 stickslip, also referred to as stiction, is the bane of engineers and machine builders who need smooth, precise motion. Therefore, a greater influence can be made on the stick slip phenomenon by the amount of the lubricating oil.
Correlation between nanosecond xray flashes and stick. The work culminates with examples of friction oscillators and stick. The relationships between surface structures of these block copolymers and their stickslip phenomena were investigated. Hi, any information out there regarding surging or pulsation of conveyors. Occurrence of stickslip phenomenon in a real laboratory rig. The movie shows the bahaviour of a tip scanning over a surface in. Modeling of stickslip phenomena using molecular dynamics this item was submitted to loughborough universitys institutional repository by thean author. Oct 23, 2008 we note that although our data clearly show stickslip motion, our peel speed of 3 cm s1 is much lower than that referred to in the literature as the stickslip regime for peeling pressure. Stickslip phenomena in the friction of human skin, wear. As an illustration of stickslip, consider a solid body of mass m resting on a belt moving with speed v 0, as shown in figure 9. Analysis and simulation of clutch engagement judder and stick. As a result, this method was approved to be correct method to study stick slip phenomena.
It is demonstrated that the observed phenomena in experimental drillstring data could be due to the. Contributions to current research in geophysics ccrg, vol 6. The results are affected by an error in the determination of the instant when the slip motion begins, which, unfortunately, is difficult to ascertain. Earthquakes have long been recognized as the result of stickslip frictional instability 164171.
Gresham contributing editor people dont often talk about stickslip in every day conversation, even among us tribologically ori. May 15, 2007 nanotribology studies friction phenomena at the atomistic scale one goal is to find out, if friction can be reduced to zero. While the character of slow earthquakes has been approximated for some time, precise slip histories and the underlying mechanisms have remained elusive. So far it seems that there are 2 main parameters witch has the biggest influence.
Influence of spring constant on stickslip behaviour static friction in the previous section, the negative slope of the stribeck curve was. Analysis and simulation of clutch engagement judder and stick slip in automotive powertrain systems a crowther, n zhang, d k liu, and j k jeyakumaran proceedings of the institution of mechanical engineers, part d. The stick slip is one of the critical problems for the scientific drilling, because it causes a crushing of the sampled layer. Stick and slip phenomena during extrusion of polyethylene. Gresham contributing editor people dont often talk about stickslip in every day conversation, even among us tribologically oriented folks. Shallow focus earthquakes may represent stick slip during sliding along old or newly formed faults in the earth. This phenomenon, which is characteristic of flow of melts and concentrated solutions at high shear stresses, is called the stick slip phenomenon. Stickslip algorithm in a tangential contact force model for multibody.
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 handbook of frictionvibration interactions, 2014. In conjunction with shear load stiffness, the normal load stiffness, often neglected, is shown to have a considerable effect on the stickslip process its presence or absence and its characteristics. Nanotribology studies friction phenomena at the atomistic scale one goal is to find out, if friction can be reduced to zero. We show that the response of the stick slip system to an external noise displays a progressive speedup before the transition, in contrast with the well known critical slowingdown observed in the standard case. It can be seen that the suppression effects of the stickslip phenomenon of s2 and s5 samples are mainly due to the lubricating oil film when the upper and lower samples move relatively to each other. The stickslip vibration and bifurcation of a vibroimpact.