Experimental Validation of an Elastic-Plastic Contact Model

Brake, Matthew Robert; Reu, Phillip L.; Vangoethem, Douglas J.; Valentine, Bejarano, Michael; Sumali, Anton Hartono

doi:10.1115/imece2011-65736

Cited by 10 publications

(5 citation statements)

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“…The model is also adaptable to macroscopic contact. Brake et al [29,30] used the Von Mises yield criterion and Brinell hardness to determine the amount of elastic-plastic deformation and plastic deformation of the asperity. Brake interpolated the elastic-plastic contact phase using Hermit polynomials to find the relationship between the contact area and the average contact pressure and deformation of the elastic-plastic phase.…”

Section: Theoretical Modeling Of Fully Elastic and Fully Plastic Defo...mentioning

confidence: 99%

A Review of Cross-Scale Theoretical Contact Models for Bolted Joints Interfaces

Liu,

Zhu,

et al. 2024

Coatings

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Bolted joints structures are critical fastening components widely used in mechanical equipment. Under long-term loading conditions, the bolted joints interface generates strong nonlinearities within the system. The nonlinear stiffness inside the bolt leads to changes in the stiffness of the whole system. This affects the dynamic characteristics of the whole system. It brings challenges and difficulties to the performance prediction and reliability assessment of the equipment. A cross-scale theoretical model study based on the microscopic contact mechanism can provide a more comprehensive understanding and cognition of the degradation behavior of bolted joints interfaces. The current development status and deformation process of asperity models are summarized. The research progress of statistical summation model and contact fractal model based on microscopic contact mechanism is analyzed. The experimental methods for parameter identification of connection interfaces are reviewed. The study of numerical modelling of bolted joints structures from the surface contact mechanism is briefly described. Future research directions for cross-scale modelling of bolted joints structures are outlined.

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Section: Theoretical Modeling Of Fully Elastic and Fully Plastic Defo...mentioning

confidence: 99%

A Review of Cross-Scale Theoretical Contact Models for Bolted Joints Interfaces

Liu,

Zhu,

et al. 2024

Coatings

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“…To avoid some of the main difficulties reported by other authors to obtain accurate measurements, a full-field optical technique known as 3D-DIC (Three Dimensional Digital Image Correlation) has been used. Some authors, such as preliminary studies using DIC to analyze the contact phenomenon were reported for other applications Brake et al [20] and Baca et al [21] have performed preliminary studies using the DIC technique to analyze the contact phenomena for other applications. In a contact test using conventional techniques, the indenter usually hides the area of interest and it represents a limitation in the measuring process during the experiment, as it was reported by Jamari and Schipper [22] in the experiment designed.…”

Section: Introductionmentioning

confidence: 99%

Indentation Measurement in Thin Plates under Bending Using 3D Digital Image Correlation

et al. 2021

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In the current paper, a novel experimental methodology to characterize the contact behavior on thin plates under bending is presented. The method is based on the experimental measurement of the indentation observed during contact experiments. Tests were conducted using aluminum thin plates and a steel sphere to evaluate the effect of thickness and bending during contact. For this purpose, a non-contact optical technique, 3D Digital Image Correlation (3D-DIC), has been employed to measure the out-of-plane displacements experienced at the rear face of the specimens (opposite where the contact is occurring). An indirect measurement of the experimental contact law is obtained for different plate thicknesses (2 mm, 3 mm, 4 mm, 5 mm and 6 mm) as the contact load increases. An energy balance performed during contact experiments made it possible to evaluate and quantify the applied energy to generate bending and contact deformation. When the specimen thickness increases from 2 mm to 6 mm, contact deformation reaches higher values from the total applied energy. In addition, it is also possible to evaluate the portion of the elastically recovered energy for contact and bending deformation during the unloading. It has been observed that thicker specimens show a lower elastic energy recovery due to bending and a higher elastic energy recovery due to contact. Results clearly show how the ratio between absorbed and applied energy changes as the specimen thickness increases, highlighting the relevance of the proposed method for the characterization of contact behavior in thin plates.

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“…On the contrary, although the quasi‐static elastoplastic contact models can accurately describe the relationship between the loading and displacement in the elastoplastic contact phase, they made the calculation strategy of elastoplastic contact behavior in the granular chain more complicated 16,52,54,57 . It needs to be emphasized that the elastoplastic collision in the granular chain depends on the constitutive relation of contact bodies, 46 and the convenient and straightforward calculation strategy is determined by the damping factor 26 . Therefore, this investigation not only replaces the Hertz contact stiffness of existing dashpot models in the elastoplastic phase by means of the quasi‐static elastoplastic contact model (Ma‐Liu (ML) model), but also proposes a new damping factor without initial impact velocity by solving a single‐degree‐freedom underdamped vibration equation.…”

Section: Introductionmentioning

confidence: 99%

“…43 That is mainly because the Hertz contact stiffness 44,45 overestimates the contact stiffness in the elastoplastic or plastic contact phase. Accordingly, to overcome this problem, some scholars [46][47][48][49][50][51] developed a series of quasi-static elastoplastic contact models to describe the elastoplastic contact events using the piecewise function, including the elastic, elastoplastic, and full plastic phase. Since these elastoplastic contact models depend entirely on the constitutive relation of contact bodies, they can accurately reflect the relationship between the force and displacement in the elastoplastic phase.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear wave in granular systems based on elastoplastic dashpot model

Wang

Liu

2021

Int Journal of Mech Sys Dyn

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The dynamic dashpot models are widely used in EDEM commercial software.However, most dashpot models suffer from a serious numerical issue in calculating the granular chain because the denominator of damping force includes the initial impact velocity. Moreover, the existing dynamic dashpot models extended from the original Hertz contact law overestimated the contact stiffness in the elastoplastic contact phase. These two reasons above result in most dynamic dashpot models confronting some issues in calculating the multiple collision of the granular chain. Therefore, this investigation aims to propose a new composite dynamic dashpot model for the dynamic simulation of granular matters. First, the entire contact process is divided into three different phases: elastic, elastoplastic, and full plastic phases. The Hertz contact stiffness is still used in the elastic contact phase when the contact comes into the elastoplastic or full plastic phase. Hertz contact stiffness in the dynamic dashpot model is replaced by linearizing the contact stiffness from the Ma-Liu (ML) model in each time step. Second, the whole contact behavior is treated as a linear mass-spring-damper model, and the damping factor is obtained by solving the single-degree-freedom underdamped vibration equation. The new dynamic dashpot model is proposed by combining the contact stiffnesses in different contact phases and corresponding damping factors, which not only removes the initial impact velocity from the denominator of damping force but also updates the contact stiffness based on the constitutive relation of the contact body when the contact comes into the elastoplastic or full plastic phase. Finally, a granular chain is treated as numerical examples to check the reasonability and effectiveness of the new dynamic dashpot model by comparing it to the experimental data. The simulation shows that the solitary waves obtained using the new dashpot model are more accurate than the dashpot model used in EDEM software.

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Experimental Validation of an Elastic-Plastic Contact Model

Cited by 10 publications

References 0 publications

A Review of Cross-Scale Theoretical Contact Models for Bolted Joints Interfaces

A Review of Cross-Scale Theoretical Contact Models for Bolted Joints Interfaces

Indentation Measurement in Thin Plates under Bending Using 3D Digital Image Correlation

Nonlinear wave in granular systems based on elastoplastic dashpot model

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