Analysis of repeated impacts on a steel rod with visco-plastic material behavior

Minamoto, Hirofumi; Seifried, Robert; Eberhard, Peter; Kawamura, Shozo

doi:10.1016/j.euromechsol.2010.12.002

Cited by 32 publications

(18 citation statements)

References 19 publications

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“…For impact simulations plastic and viscoelastic material laws instead of linear elastic material laws should be used if high accuracy is required. In Minamoto et al [9] the influence of these effects is shown in detail giving very good agreement with the performed experiments. However, the influence of these complex material laws is most important for the first few impacts where plastic deformations occur.…”

Section: Materials Damping and Shakedownsupporting

confidence: 67%

“…The reason for that effect are permanent changes which are caused by plastic deformations. This effect is studied in detail in Minamoto et al [9] where the same behaviour occurs. Normally, impacts with plastic deformation have a lower coefficient of restitution and therefore also a lower efficiency.…”

Section: Resultsmentioning

confidence: 62%

“…As a further complication, due to the high speed and high strain rate˙ , nonlinear material effects like viscoplasticity must be considered too, if plasticity is modelled. See Minamoto et al [9] for a detailed analysis of these effects. Typically, the difference between elastic and plastic simulations are especially large for the first few impacts.…”

Section: Design With Flexible Mounted Seal Seatmentioning

confidence: 99%

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Investigation and design of an impact actuated micro shift valve

et al. 2013

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New concepts for an impact actuated micro shift valve are presented which are useful e.g. as implant for the hydrocephalus disease. Such an implant must fulfil requirements, such as using biocompatible materials, a separation of the actuator from the fluid, MRT safety and low energy consumption in order to allow a battery powered system. The concepts are based on impacts that transmit an impulse into the interior of the valve through the casing, switching the valve. In order to predict the energy transmitted into the valve, an elastic multibody model is created, verified with full finite element simulations and experiments on scaled-up models. Using this model, the most important effects and parameters are discussed. Also, fluid effects are included into the elastic multibody model for a qualitative assessment of its influence on the efficiency. The simulations are compared to experiments performed with a scaled model for two different cases. Two designs of a shift valve based on impact actuation are built as prototypes and tested.

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Section: Materials Damping and Shakedownsupporting

confidence: 67%

Section: Resultsmentioning

confidence: 62%

Section: Design With Flexible Mounted Seal Seatmentioning

confidence: 99%

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Investigation and design of an impact actuated micro shift valve

et al. 2013

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“…[19] can be derived for each ratio between the hardening slope and the Young's modulus. A master equation in the form of Eq.…”

Section: Effect Of Isotropic Hardening On a Single Impact's Coefficiementioning

confidence: 99%

On the Effect of Isotropic Hardening on the Coefficient of Restitution for Single or Repeated Impacts Using a Semi-Analytical Method

Chaise

Nélias

Sadeghi

2011

Tribology Transactions

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A semi-analytical method is proposed for the simulation of moderately high-speed impacts of a relatively hard particle on an elastic-plastic substrate. Potential applications of the current modeling approach include shot-peening and ultrasonic peening as well as impacts on functional surfaces such as mechanical seals or bearings. The coefficients of restitution for single impacts on an elastic-perfectly plastic semi-infinite body or one with isotropic hardening have been computed for various impact velocities. The current approach is three dimensional and numerically efficient in terms of CPU time and memory space required. Numerical results are in good agreement with those obtained by other authors for elastic-perfectly plastic behavior. Coefficients of restitution resulting from repeated impacts at a constant initial velocity are also studied. Finally, equations fitting these numerical results are proposed.

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“…The contact model depends mainly on two parameters, namely the single impact COR e and the contact stiffness k of the Hertzian contact law which is derived for elastic contact. For contacts involving plasticity the contact stiffness of the loading phase is significantly lower than in the elastic case (Minamoto et al 2011), which is important for the micromechanical behavior during impact. However, it should be noted that the obtained results for the overall dynamics are fairly insensitive to the used contact stiffness k in the contact model Eq.…”

Section: Analysis Of Macro-mechanical Behavior Using Rigid Bodies Andmentioning

confidence: 99%

Restitution properties in direct central collision of three inelastic spheres

Minamoto

Seifried

Eberhard

et al. 2016

Mechanical Engineering Journal

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The purpose of this paper is to investigate the micromechanical processes during impact as well as the related macro-mechanical restitution properties in a three body multiple impact system. Thereby, the microscale refers to the detailed processes during impact, while the macroscale refers to the overall dynamics of the impact system which is normally evaluated by rigid bodies. Specifically, this paper deals with numerical and experimental investigations of direct central collisions of three identical inelastic spheres. In the experiments the velocities of three spheres during impacts are measured by Laser-Doppler-Vibrometers. In the numerical simulation, finite element analyses are performed, where the material properties obtained from static and dynamic compression tests are used. In order to confirm the validity of the numerical model, the results from the finite element analyses are compared to the experimental results and show good agreement. Afterwards, micromechanical investigations of the impact processes are performed using finite element analysis. Thereby quantities such as impact force, deformation, and kinetic energy loss are investigated in detail. Then, the macroscale rebound properties of multiple collisions are derived using the simulation results on a microscale. In general, a single coefficient of restitution (COR) can be used to evaluate on the macroscale the restitution property in two body impacts. However, in instantaneous impact modelling this cannot be used for general multibody systems where multiple concurrent impacts occur. Therefore, a COR matrix is employed in this paper as measure of the macroscale restitution properties and the overall impact dynamics of the system. Finally, a rigid body simulation with continuous contact law is attempted as an alternative macro-mechanical model. It is shown for this specific impact system that this method can produce practical macroscale behavior of the colliding spheres if a simple single impact COR is used. This is shown by comparison with the COR matrix.

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Analysis of repeated impacts on a steel rod with visco-plastic material behavior

Cited by 32 publications

References 19 publications

Investigation and design of an impact actuated micro shift valve

Investigation and design of an impact actuated micro shift valve

On the Effect of Isotropic Hardening on the Coefficient of Restitution for Single or Repeated Impacts Using a Semi-Analytical Method

Restitution properties in direct central collision of three inelastic spheres

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