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  • Open Access


    The angles and friction coefficients of some rheological granular materials

    Emil Budescu1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.1, pp. 17-18, 2009, DOI:10.3970/icces.2009.011.017

    Abstract For the visco-plastic materials of type Bingham fluid, like granular materials, the process of flow begins when the force Fˉ, which variation is presented in figure 1, reaches the minimum value of shearing limit. More >

  • Open Access


    Computation of Optimal Friction of Tuned Mass Damper for Controlling Base-Excited Structures

    Sang-Hyun Lee1, Sung-Sik Woo1, Seung-Ho Cho1, Lan Chung1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 115-120, 2008, DOI:10.3970/icces.2008.008.115

    Abstract In this study, based on the results from the sinusoidal base excitation analyses of a single degree of freedom system with a tuned mass damper (TMD), the optimal friction is computed so that the rail friction improve the performance of the TMD. The magnitude of the optimal friction increases with increasing mass ratio of the TMD and decreases with increasing structural damping. Particularly, it is observed that the optimized friction force gives better control performance than the optimized viscous damping of the TMD. However, because the performance of the TMD considerably deteriorates when the friction More >

  • Open Access


    Constitutive Relation for Friction Describing Transition from Static to Kinetic Friction and Vice Versa

    K. Hashiguchi1, S. Ozaki2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.2, pp. 125-132, 2008, DOI:10.3970/icces.2008.006.125

    Abstract The subloading-friction model with a smooth elastic-plastic sliding transition is extended so as to describe the reduction from the static to kinetic friction and the recovery of static friction. The reduction is formulated as the plastic softening due to the separations of the adhesions of surface asperities induced by the sliding and the recovery is formulated as the creep hardening due to the reconstructions of the adhesions of surface asperities during the elapse of time under a quite high actual contact pressure between edges of asperities. More >

  • Open Access


    Effect of chamfered brake pad patterns & lining friction coefficients on the vibration squeal response for automotive disc brake system

    En-Cheng Liu1, Syh-Tsang Jenq1,2, Shih-Wei Kung3, Chie Gau1, Hsin-Luen Tsai4, Cheng-Ching Lee5, Yu-Der Chen5

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 245-246, 2009, DOI:10.3970/icces.2009.009.245

    Abstract The purpose of the present work is to study the disc brake squeal problem for passenger cars in order to reduce the instable high frequency squeal modes. The ABAQUS/Standard implicit method was used to perform dynamic contact vibration analysis of the current disc brake finite element model. The disc brake system studied here contains the caliper, bracket, brake disc, and brake pad. Notice that brake pad in general contains both brake lining and brake shoe. The brake pad with a specific chamfer pattern and the brake disc with a series of cooling ribs for ventilation… More >

  • Open Access


    Skin Friction Estimation in Adverse Pressure Gradient Boundary Layers Using Corrected Clauser-Chart Method

    Witold Elsner1,*, Artur Dróżdż1, Paweł Niegodajew1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.2, pp. 41-41, 2019, DOI:10.32604/icces.2019.05114

    Abstract Estimation of the wall skin friction in a turbulent boundary layer (TBL) is always challenging due to the large gradient of mean velocity in the near-wall region and requires precise measurements of mean velocity in viscous sublayer. This problem becomes even more serious for a flow with a strong positive pressure gradient where the low velocity closes the wall occurs. Hence, choosing an appropriate measuring technique for the wall skin friction measurement is an important issue. Most commonly used for this purpose is hot-wire technique, where determination of mean velocity gradient is strongly dependent on… More >

  • Open Access


    A Frictionless Contact Algorithm for Meshless Methods

    R. Vignjevic1, T. De Vuyst2, J.C. Campbell1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.3, No.2, pp. 107-112, 2007, DOI:10.3970/icces.2007.003.107

    Abstract An approach to the treatment of contact problems involving frictionless sliding and separation under large deformations in meshless methods is proposed. The method is specially suited for non-structured spatial discretisation. The contact conditions are imposed using a contact potential for particles in contact. Inter-penetration is checked as a part of the neighbourhood search. In the case of conventional SPH contact conditions are enforced on the boundary layer 2h thick while in the case of the normalized SPH contact conditions are enforced for the particles lying on the contact surface. The implementation of the penalty based More >

  • Open Access


    Shear Strength of Unbound Crop By-Products Using the Direct Shear Box Apparatus

    Morgan Chabannes1,2,*, Frédéric Becquart1,2, Nor-Edine Abriak1,2

    Journal of Renewable Materials, Vol.7, No.9, pp. 855-863, 2019, DOI:10.32604/jrm.2019.06779

    Abstract The return to old building methods by mixing crop by-products with mineral binders is arousing great interest in Europe since about 25 years. The use of these bio-aggregates based materials for the design of building envelopes is a valuable opportunity to deal with increasingly demanding thermal regulations. In addition, the regulatory framework is moving towards reducing the overall car-bon footprint of new buildings. Some traditional and historic buildings are based on timber framing with earth-straw as infill material for instance. Hemp concrete is a bio-based material that can be manually tamped in timber stud walls… More >

  • Open Access


    Partitioned Formulation for Solving 3D Frictional Contact Problems with BEM using Localized Lagrange Multipliers

    L. Rodríguez-Tembleque1, J.A. González1, R. Abascal1, K.C. Park2, C.A. Felippa2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.1, pp. 21-28, 2007, DOI:10.3970/icces.2007.002.021

    Abstract This work presents an interface treatment method based on localized Lagrange Multipliers (LLM) to solve frictional contact problems between two 3D elastic bodies. The connection between the solids is done using a displacement frame intercalated between the interfaces meshes, and the LLM are collocated at the interface nodes. The Boundary Elements Method (BEM) is used to compute the influence coefficients of the surface points involved, and contact conditions are imposed using projection functions. The LLM provides a partitioned formulation which preserves software modularity, facilitates non-matching meshes treatment and passes the contact patch test [4]. More >

  • Open Access


    Optimized Bearing and Interlayer Friction in Multiwalled Carbon Nanotubes

    Wanlin Guo1,2, Huajian Gao2

    CMES-Computer Modeling in Engineering & Sciences, Vol.7, No.1, pp. 19-34, 2005, DOI:10.3970/cmes.2005.007.019

    Abstract A systematic investigation is performed on energy dissipation related interaction force associated with interlayer motion of sliding, rotation and telescoping between any two possible neighboring carbon nanotubes. In particular, we analyze the interlayer corrugation energy and sliding, rotation and telescoping resistance force associated with the Lennard-Jones potential as well as a registry-dependent graphitic potential. It is found that the interlayer resistance associated with both of these potentials can vary with the morphology, length and diameter of the two tubes. Energy dissipation related fluctuation of the resistant force can be as low as 10-18N/atom between the most More >

  • Open Access


    A Coupled Friction-Poroelasticity Model of Chimneying Shows that Confined Cells Can Mechanically Migrate Without Adhesions

    Solenne Mondésert-Deveraux1, *, Rachele Allena2, Denis Aubry1

    Molecular & Cellular Biomechanics, Vol.15, No.3, pp. 155-176, 2018, DOI:10.3970/mcb.2018.03053

    Abstract Cell migration is the cornerstone of many biological phenomena such as cancer metastasis, immune response or organogenesis. Adhesion-based motility is the most renown and examined motility mode, but in an adhesion-free confined environment or simply to achieve a higher migration speed, cells can adopt a very interesting bleb-based migration mode called “chimneying”. This mode rests on the sharp synchronization between the active contraction of the cells uropod and the passive friction force between the cell and the confining surface. In this paper, we propose a one dimensional poroelastic model of chimneying which considers the active… More >

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