Energy dissipation during normal impact of elastic and elastic–plastic spheres

Wu, Chuan‐Yu; Li, Long-yuan; Thornton, Colin

doi:10.1016/j.ijimpeng.2005.08.007

Cited by 201 publications

(114 citation statements)

References 16 publications

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“…6). This relationship is supported by investigations of elastoplastic contact reaction (Wu et al, 2003(Wu et al, , 2005Hayakawa and Kuninaka, 2003;Heidenreich, 2004). Similar relationships are also found in studies based on field data from rock slopes (Wu, 1985;Pfeiffer and Bowen, 1989;Pfeiffer et al, 1993).…”

Section: Initial Simulation Runs In Vaujanymentioning

confidence: 77%

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Evaluation of a 3-D rockfall module within a forest patch model

Rammer

Brauner

Dorren

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Abstract. Many slopes in the Alps are prone to rockfall and forests play a vital role in protecting objects such as (rail) roads and infrastructure against rockfall. Decision support tools are required to assess rockfall processes and to quantify the rockfall protection effect of forest stands. This paper presents results of an iterative sequence of tests and improvements of a coupled rockfall and forest dynamics model with focus on the rockfall module. As evaluation data a real-size rockfall experiment in the French Alps and two 2-D rockfall trajectories from Austria and Switzerland were used. Modification of the rebound algorithm and the inclusion of an algorithm accounting for the sudden halt of falling rocks due to surface roughness greatly improved the correspondence between simulated and observed key rockfall variables like run-out distances, rebound heights and jump lengths for the real-size rockfall experiment. Moreover, the observed jump lengths and run-out distances of the 2-D trajectories were well within the stochastic range of variation yielded by the simulations. Based on evaluation results it is concluded that the rockfall model can be employed to assess the protective effect of forest vegetation.

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Section: Initial Simulation Runs In Vaujanymentioning

confidence: 77%

“…6). Generally, this approach is supported by many studies over various materials and settings (Wu, 1985;Wu et al, 2003Wu et al, , 2005Hayakawa and Kuninaka, 2003;Heidenreich, 2004).…”

Section: Rebound Algorithmmentioning

confidence: 98%

Evaluation of a 3-D rockfall module within a forest patch model

Rammer

Brauner

Dorren

et al. 2010

Nat. Hazards Earth Syst. Sci.

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“…In the case of normal impact of elastic sphere with elastic substrate, the investigations were conducted by Hunter [5] and Wu et al [6]. They found the amount of kinetic energy of the ball that is converted into elastic waves.…”

Section: Introductionmentioning

confidence: 99%

A finite sliding model of two identical spheres under displacement and force control. Part II: dynamic analysis

Balevičius

Mróz

2013

Acta Mech

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In Part I of the present study, the static analysis for the sliding of two identical spheres under displacement and force control was carried out. For linear and circular sliding trajectories, the contact traction evolution was analytically specified for both monotonic and reciprocal sliding regimes. Similarly, for the specified gravity loading, the driving force evolution and the sliding path were also determined. In the present Part II of the analysis, the dynamic response for the same sliding modes is presented. The contact traction and velocity evolutions are considered in detail. The analytical formulae are proposed for prediction of the tangential restitution coefficient, critical velocity, and time of contact for the displacement and load-controlled motions. The effects of loading and reloading in reciprocal sliding are also considered with account for the slip and sliding regimes. The generated results have practical aspects and can be implemented in modeling of the asperity and rough surface interaction, wear analysis and also in the development of the numerical discrete element method.

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“…(6) Fathallah et al (7) carried out the theoretical and experimental analyses in order to link the coefficient of restitution with the shot hardness and material hardness. Extensive analyses of the coefficient of restitution during the impact have been carried out by Wu et al (8)- (10) and Weir and McGavin. (11) Shot peenings are very complex phenomena, since a large number of particles hit the specimen surface in a short period.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hardness Ratio on Plastic Dissipation in Fine Particle Peening

Omiya¹,

Kikuchi

Hirota³

et al. 2010

JMMP

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A large number of tiny particles, which is less than 200 μm in diameter, hit the specimen simultaneously for the surface modification in Fine Particle Peening (FPP) treatments. For the fatigue resistance, it is important to induce the higher compressive stress at the surface. In FPP treatment, the induced compressive residual stress is influenced by many parameters such as material properties, particle size, nozzle distance, air pressure and so on. We focused on the material hardness and investigated the effect of hardness ratio between a shot particle and a specimen on the plastic dissipation energy and the compressive residual stress in the specimen. FPP treatment is very complex and it is quite difficult to observe the local phenomena in experiments. Thus, numerical simulations were employed in this study. The obtained results show that the hardness ratio is the dominant parameter for the plastic dissipation in the specimen. As the hardness ratio increases, the kinetic energy of shot particles effectively transfers into the plastic dissipation in the specimen and the higher compressive residual stress is induced in the specimen.

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Energy dissipation during normal impact of elastic and elastic–plastic spheres

Cited by 201 publications

References 16 publications

Evaluation of a 3-D rockfall module within a forest patch model

Evaluation of a 3-D rockfall module within a forest patch model

A finite sliding model of two identical spheres under displacement and force control. Part II: dynamic analysis

Effect of Hardness Ratio on Plastic Dissipation in Fine Particle Peening

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