Finite element simulation and experimental validation of fretting wear

https://repositorium.sdum.uminho.pt/bitstream/1822/23277/1/6.7.12%202009.pdf

Modeling and simulation of wear in revolute clearance joints in multibody systems

https://coefs.uncc.edu/tschmit4/files/2011/11/revolute.pdf

Analysis of planar multibody systems with revolute joint wear

There exist two types of commonly studied stochastic elliptic models in literature: (I) � r � (a(x,x)r u(x,x)) = f(x) and (II) � r �ð aðx; xÞ}ruðx;xÞÞ ¼ f ðxÞ, where x indicates randomness, } the Wick product, and a(x,x) is a positive random process. Model (I) is widely used in engineering and physical applications while model (II) is usually studied from the mathematical point of view. The difference between the above two stochastic elliptic models has not been fully clarified. In this work, we discuss the difference between models (I) and (II) when a(x,x) is a log-normal random process. We show that the difference between models (I) and (II) is mainly characterized by a scaling factor, which is an exponential function of the degree of perturbation of a(x,x). We then construct a new stochastic elliptic model (III): � r �ð ða

/pdf/comput-methods-appl-mech-engrg-qn80ahqrxx.pdf

Comput. Methods Appl. Mech. Engrg.

In order to predict wear and eventually the life-span of complex mechanical systems, several hundred thousand operating cycles have to be simulated. Therefore, a finite element (FE) post-processor is the optimum choice, considering the computational expense. A wear simulation approach based on Archard's wear law is implemented in an FE post-processor that works in association with a commercial FE package, ABAQUS, for solving the general deformable–deformable contact problem. Local wear is computed and then integrated over the sliding distance using the Euler integration scheme. The wear simulation tool works in a loop and performs a series of static FE-simulations with updated surface geometries to get a realistic contact pressure distribution on the contacting surfaces. It will be demonstrated that this efficient approach can simulate wear on both two-dimensional and three-dimensional surface topologies. The wear on both the interacting surfaces is computed using the contact pressure distribution from a two-dimensional or three-dimensional simulation, depending on the case. After every wear step the geometry is re-meshed to correct the deformed mesh due to wear, thus ensuring a fairly uniform mesh for further processing. The importance and suitability of such a wear simulation tool will be enunciated in this paper.

http://iopscience.iop.org/article/10.1088/0965-0393/13/1/005/pdf

Finite element based simulation of dry sliding wear

Simulating sliding wear with finite element method

Finite element analysis wear simulation of a conical spinning contact considering surface topography

Gradient microstructure in tantalum formed under the wear track during dry sliding friction

In the current study, the cracking, impact and sliding wear resistance of the PVD single layer TiN (I generation), multilayer (Ti,Al)N-ML (II generation), gradient (Al,Ti)N-G and multilayer nanocomposite FiVIc® (both – III generation) coatings on the nitrided low alloy steel 42CrMo4 are analysed. The cyclic indentation test (normal load 50 N, 10 000 cycles) was carried out to determine the cracking resistance of the coatings. Impact wear test was performed at the normal load 16 N, strokes’ frequency 25 Hz, 10 4 – 10 7 strokes. Sliding wear test was applied, using the block-on-plate scheme, O 10 mm Al 2 O 3 ball as the counterbody, at the normal load of 10 N, the frequency 5 Hz, the amplitude 10 mm and the test duration 10 min. Best resistance to cracks’ formation is demonstrated by the gradient (Al,Ti)N-G coating, showing medium radial cracks’ formation, whereas delamination of the coating can be observed in other cases. 1.6 – 1.7 times higher impact wear resistance is shown by the TiN coating in comparison with the other coatings. The FiVIc® coating demonstrates lightly better resistance to sliding wear in comparison with the TiN and (Ti,Al)N-ML coatings due to a lower coefficient of friction. The worst sliding wear resistance is observed in the case of the (Al,Ti)N-G coating due to a high affinity of the coating’s and counterbody’s materials. DOI: http://dx.doi.org/10.5755/j01.ms.18.1.1339

/pdf/comparative-study-of-the-pvd-coatings-on-the-plasma-nitrided-55certc0rp.pdf

Comparative Study of the PVD Coatings on the Plasma Nitrided Steel

Contact modeling could be widely used for different machine elements normal contact pressure calculations and wear simulations. However, classical contact models as for example Hertz contact models have many assumptions (contact bodies are elastic, the contact between bodies is ellipse-shaped, contact is frictionless and non-conforming). In conditions, when analytical calculations cannot be performed and experimental research is economically inexpedient, numerical methods have been applied for solving such engineering tasks. Contact stiffness parameters appear to be one of the most influential factors during finite element modeling of contact. Contact stiffness factors are usually selected according to finite element analysis software recommendations. More precise analysis of contact stiffness parameters is often required for finite element modeling of contact.

Priit Põdra

Papers

Simulating sliding wear with finite element method

Finite element analysis wear simulation of a conical spinning contact considering surface topography

Gradient microstructure in tantalum formed under the wear track during dry sliding friction

Comparative Study of the PVD Coatings on the Plasma Nitrided Steel

Contact Stiffness Parameters for Finite Element Modeling of Contact