Stick slip phenomena pdf

The present study investigates the characteristics of stick slip phenomena of the drill pipe with the model experiments and numerical methods. However, none of those ever did researches about chaotic vibrations through. Experimental investigations on stickslip phenomenon and. 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. This phenomenon, which is characteristic of flow of melts and concentrated solutions at high shear stresses, is called the stick slip phenomenon. The stick slip vibration phenomenon has become an important risk element to evaluate in the planning of oil and gas well drilling. Molecular dynamics simulations are performed to investigate the atomicscale stickslip phenomenon of a pyramidal diamond tip inserted into the ag010 surface.

Stickslip often accompanies frictional sliding in laboratory experi ments with geologic materials. In thus study, stick slip phenomenon is simulated and studied by using complex nonlinear friction laws and contacts between a mass and moving belt. 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. In literature, the nonsmooth system possessing this kind of motion is often modelled by a discretized chain of blocks moving on a rough surface.

The existence of friction could cause a steadystate error, a limit cycle, or stick slip phenomenon at low speed in the motion control systems. Stickslip vibration, drillstring, bottomhole assembly, degree of freedom, structural coupling introduction the drillstring exhibits severe stickslip vibration induced by the contact between the drill bit and the formation. Nanotribology studies friction phenomena at the atomistic scale one goal is to find out, if friction can be reduced to zero. Study of friction induced stickslip phenomenon in a minimal. In this case, the corresponding mechanism of motion in channel proves to be unstable see section 3. Experimental evaluation of brake pad material propensity. The reason for this is the widespread use of new, highly efficient drill bits using polycrystaline diamond cutters pdc that cut the rock by sheer rotary force compared to the previous rollercone bits that crushed. Whats more, when the amount of lubricating oil is 15ml, the standard deviation values of friction coefficient and critical speed of stickslip phenomena rotational speed. Shallow focus earthquakes may represent stick slip during sliding along old or newly formed faults in the earth. In thus study, stickslip phenomenon is simulated and studied by using complex nonlinear friction laws and contacts between a mass and moving belt. Experimental investigation of the stickslip phenomena of. 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. Pdf a selfexcited system with unilateral friction contact modelled by a two degreesoffreedom mechanical system, where the normal force varies.

The stickslip vibration phenomenon has become an important risk element to evaluate in the planning of oil and gas well drilling. Earthquakes have long been recognized as the result of stickslip frictional instability 164171. Slip may not necessary occur continuously, it may alternate with adhesion. Below is a simple, heuristic description of stick slip phenomena using classical mechanics that is relevant for engineering descriptions. Hysteresis phenomena in the stickslip motion at the boundary. Be it in industry, mechanics or applied mathematics, these sys. Using this tester, micro stick slip phenomena have been investigated as a function of sliding velocity, surface morphology, normal force and contact area. Timeresolved studies of stickslip friction in sheared. Frictional motions in general are described as stickslip phenomena. 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 work culminates with examples of friction oscillators and stick. Stickslip vibration induced by dry friction force occurs in all mechanical systems with relative motion on their contacting surfaces. Using this tester, microstickslip phenomena have been investigated as a function of sliding velocity, surface morphology, normal force and contact area. A 2 dof nonlinear dynamical system with dry friction.

The analysis of the dynamic features of the substrate shows that. Simply put, its the jerkiness that can plague both plain and recirculating linear bearings when they transition from standstill to motion. Modeling of stick slip phenomena using molecular dynamics this item was submitted to loughborough universitys institutional repository by thean author. Below is a simple, heuristic description of stickslip phenomena using classical mechanics that is relevant for engineering descriptions. Pdf the occurrence of stickslip phenomenon researchgate. This will act to tear some of the skin layer away from already frozen polymer slip stick phenomena. The stickslip vibration and bifurcation of a vibroimpact. 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. A linear model of the stickslip phenomena in polymer flow in. 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.

Hysteresis phenomena in the stickslip motion at the. Since the tester can be operated in air as well as under high vacuum conditions, the environment can be controlled over a wide range. For the longchain branched polyethylene, velocity profiles were obtained which do not give any indication to wall slip in the. Frictional vibrations are phenomena, which take place between contacting surfaces with relative motion and their wear occurs by friction 8. Furthermore, it was found that there exists the chatter phenomena induced by dry friction in low frequency, and the windows of chaotic motion are. Stickslip instabilities in the shear flow of magnetorheological suspensions modesto t. The movie shows the bahaviour of a tip scanning over a surface in. For this purpose, the familiar threeconstant rheological equation and a linear wall friction law i.

Modeling of stickslip phenomena using molecular dynamics this item was submitted to loughborough universitys institutional repository by thean author. Also, a parametric study is conducted to study the effect of mass, spring and friction parameters on the stickslip effect. Identification and quantification of stickslip induced brake. Pdf the effect of vanadium content and temperature on stick. Stickslip phenomenon in measurements of dynamic contact. Modeling of stick slip phenomena using molecular dynamics. Since the ostrator was built for showcase purposes, it has to be piloted in and out. Friction models for precise positioning system in machine tools and their numerical validations are investigated 17. Also, a parametric study is conducted to study the effect of mass, spring and friction parameters on the stick slip effect. Experimental investigation of the stickslip phenomena of the. Since the ostrator was built for showcase purposes, it has to be piloted in and out stick. The newest generation of our stick slip test stand ssp04. Gresham contributing editor people dont often talk about stickslip in every day conversation, even among us tribologically oriented folks. Identification and quantification of stickslip induced.

On the other hand, the sound produced by scratching a chalkboard with the fingernails is. The stick slip is one of the critical problems for the scientific drilling, because it causes a crushing of the sampled layer. 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. The newest generation of our stickslip test stand ssp04. Journal of low frequency noise, stickslip vibrations in. The present study focuses on molecular characteristics and temperature dependence of a superfluidlike stick. Effects of brake pressures on stickslip bifurcation. May 15, 2007 nanotribology studies friction phenomena at the atomistic scale one goal is to find out, if friction can be reduced to zero. Microtribological investigations of stickslip phenomena. Stickslip whirl interaction in drillstring dynamics 3 drill bit drill pipe drill collars compression stabilisers ension mud in mud out figure 2.

Pfe master 2 internship stabilization and analysis of stick. Stick slip whirl interaction in drillstring dynamics 3 drill bit drill pipe drill collars compression stabilisers ension mud in mud out figure 2. The tension in the drillpipes avoids buckling of the drillpipe section. Stickslip, also referred to as stiction, is the bane of engineers and machine builders who need smooth, precise motion. Stickslip phenomena in the friction of human skin request pdf. Stickslip reduce risk in drilling oil and gas wells. The effects of vanadium v content and the temperature on the friction and stickslip. Besides some classical phenomena of stick slip movement such as periodical slow increase of frictional force in sticking phase and a sudden drop when slipping, a special. Eric chatelet, guilhem michon, lionel manin, georges jacquetrichardet.

How to measure, prevent, and eliminate stickslip and. A linear model of the stickslip phenomena in polymer flow. The bilateral friction is adopted to overcome the bending moment in the lateral friction movement. In this process, pure dry sliding friction, stick slip effect, viscous friction, stribeck effect, and frictional lag are some of the main phenomena associated with friction, which are addressed. Whats more, when the amount of lubricating oil is 15ml, the standard deviation values of friction coefficient and critical speed of stickslip phenomena rotational speed when the standard deviation of. The work culminates with examples of friction oscillators and stick slip. Understanding slip perception of soft fingertips by. Gresham contributing editor people dont often talk about stickslip in every day conversation, even among us tribologically ori. In this process, pure dry sliding friction, stickslip effect, viscous friction, stribeck effect, and frictional lag are some of the main phenomena associated with friction, which are addressed. In contrast to stationary sliding friction, stickslip friction is characterized by considerable variations in the friction force and is in many cases accompanied by acoustic emissions. In sum, many researchers and scholars have seen many phenomena related to the chaotic stickslip vibrations of the brake system under different friction models through tangential vibration model. The phenomenon occurs when static friction and kinetic friction cross swords.

View stickslip phenomena research papers on academia. Study of friction induced stickslip phenomenon in a. Atomistic simulation of stickslip behaviour youtube. Simultaneously, the antistickslip effect of bulgetextured surface is superior to that of the dentshaped texturing surface. Stabilization and analysis of stickslip 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. Pdf friction is a complex process involving multiscale asperity contact and large plastic deformation associated with the development of a. Stick slip motion of plain machine tool slideways has been simulated numerically 16. Dec 01, 2016 stickslip, also referred to as stiction, is the bane of engineers and machine builders who need smooth, precise motion. Paper evolution of real contact area during stickslip. Modeling of stickslip phenomena using molecular dynamics. Lopezlopez,1 pavel kuzhir,2 laura rodriguez arco1, jaime caballerohernandez,1 juan d. Stickslip phenomenon an overview sciencedirect topics.

One of the most beautiful sounds to many people is that produced by bowing a violin or other stringed instrument. The stickslip vibration and bifurcation of a vibroimpact system with dry friction. Stick and slip phenomena during extrusion of polyethylene. The stickslip is one of the critical problems for the scientific drilling, because it causes a crushing of the sampled layer. Distinct stickslip modes in adhesive polymer interfaces. Using the logistic map to generate scratching sounds the. A linear approach was employed for the qualitative theoretical study of the stickslip phenomena in polymer flows in rheometers. How to measure, prevent, and eliminate stickslip and noise. Apr 01, 20 stickslip phenomena in the friction of human skin stickslip phenomena in the friction of human skin derler, s rotaru, g. Experimental evaluation of brake pad material propensity to. Timeresolved studies of stickslip friction in sheared granular layers s.

Stickslip phenomena in the friction of human skin, wear 10. The relationships between surface structures of these block copolymers and their stickslip phenomena were investigated. Results showed that the typical stickslip phenomena appeared in the process of the fronttip sliding on the esophageal internal surface, which was related to the alternating deformation. The present study investigates the characteristics of stickslip phenomena of the drill pipe with the model experiments and numerical methods. This phenomenon, which is characteristic of flow of melts and concentrated solutions at high shear stresses, is called the stickslip phenomenon. Besides some classical phenomena of stickslip movement such as periodical slow increase of frictional force in sticking phase and a sudden drop when slipping, a special phenomenon that the contact area increases with the tangential force is observed, which was called junction growth by tabor in 1959. Slipstick makes the cello beautiful and the squeaky door annoying. Pfe master 2 internship stabilization and analysis of. It was assumed that a detailed analysis of stickslip phenomena provides new insights into the friction mechanisms of human skin. Stickslip phenomena in the friction of human skin stickslip phenomena in the friction of human skin derler, s rotaru, g. Pdf the effect of vanadium content and temperature on.

It is found that at sufficiently high stresses the capillary flow characteristics are largely dictated by the stick. 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. The stickslip phenomenon, also known as the slipstick phenomenon or simply stickslip, is the spontaneous jerking motion that can occur while two objects are sliding over each other. The aim of this work is to investigate the stickslip phenomenon under friction of crvxn x. Stickslip motion of plain machine tool slideways has been simulated numerically 16. 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. Journal of low frequency noise, stickslip vibrations in oil.

The development of the constitutive law of rock friction illustrates that many earthquake phenomena are all attributed to the manifestations of friction law. Chatelet, eric and michon, guilhem and manin, lionel and jacquet, georges stickslip phenomena in dynamics. Results showed that the typical stick slip phenomena appeared in the process of the fronttip sliding on the esophageal internal surface, which was related to the alternating deformation. The mechanisms behind the stickslip events are investigated by considering sliding speeds between 1. There is a transition from stickslip to a closely smooth motion for the sis films with increasing ps content. Stickslip phenomena in the friction of human skin, wear. Investigate stickslip intervals with one equation of motion and analyse the effect of the friction noise ammar.

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