Experimental study of the effect of temperature on the coefficient of restitution of steel balls impact to some industrial metal sheets at elevated temperatures

Hashemnia, Kamyar

doi:10.1016/j.powtec.2020.04.053

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…Another way of modeling contact is from the force-displacement relationship [23,41], which is usually established by analyzing the static contact process. Greenwood and Williamson [42] developed a static plastic contact model for two rough surfaces.…”

Section:  +mentioning

confidence: 99%

Energy Dissipation Analysis for Elastoplastic Contact and Dynamic Dashpot Models

Wang

Liu

2022

International Journal of Mechanical Sciences

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Section:  +mentioning

confidence: 99%

Energy Dissipation Analysis for Elastoplastic Contact and Dynamic Dashpot Models

Wang

Liu

2022

International Journal of Mechanical Sciences

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“…With a density ρ � 7800 kg•m 3 , the mass of the drill rod is m r � 8.34 kg. Assuming the initial velocity of the drill rod is 0, the impact duration Δt � 0.001 s and the coefficient of restitution e � 0.5 [24][25][26]. e impact forces bear by the drill rod are calculated under different load conditions, as shown in Table 3.…”

Section: Load Conditionmentioning

confidence: 99%

Parameters Optimization and Energy Absorption Evaluation of the Steel Ball Friction Energy Absorber

Gong

2021

Shock and Vibration

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The energy absorber is used to simulate the reaction of a working piece subjected to a vibration stimulus, by which the consistent and repeatable reactions to the tool’s vibration inputs could be achieved. According to the proposed coupling simulation model by using commercial software RecurDyn and EDEM, the energy dissipated by the energy absorber and the contact force between the drill rod and the piston are evaluated under different load conditions such as the impact frequency and impact stroke. Moreover, the effects of the ball diameter, ball column height, and diameter on the energy absorption characteristics are also studied. The results show that the impact frequency and stroke influence the energy absorber by changing the impact force; the energy absorption is more obvious under higher impact frequency and long impact stroke. The filling ball diameter influences the energy reflectivity by changing the porosity, which is negatively correlated to the energy reflectivity, and a 6 mm filling ball diameter is suggested. The energy reflectivity is inversely proportional to the ball column height and diameter, and the suggested ball column diameter and height are 160 mm and 600 mm, respectively, with energy reflectivity of 0.045. Even when the increase in impact frequency and stroke will increase the contact force, the dynamic load factor decreases. The contact force and dynamic load factor are inversely proportional to the ball column height, but they are not influenced by the ball diameter and the ball column diameter.

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“…The coefficient of restitution (abbreviated as COR) is used to access the degree of rebound after the collision of two objects. It is first used in the building field, including sand 1 and concrete, 2 then applied to pipes 3 and metal sheets 4 and finally used in packaging engineering. 5 The impact object, [6][7][8] impact base, 9,10 impact velocity, [11][12][13][14] number of impacts 15,16 and impact orientation 17 all have an influence on the COR.…”

Section: Introductionmentioning

confidence: 99%

“…5 The impact object, [6][7][8] impact base, 9,10 impact velocity, [11][12][13][14] number of impacts 15,16 and impact orientation 17 all have an influence on the COR. There are three primary categories: displacement COR, 1,4 velocity COR 12,15 and energy COR. 11,13 A packaging system-base collision can be quantified by the velocity COR, which is defined as the ratio of the rebound velocity to the initial velocity:…”

Section: Introductionmentioning

confidence: 99%

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Exploring factors affecting the conversion of the coefficient of restitution to equivalent free fall drop height

Lin,

Ge,

Qian

et al. 2023

Packag Technol Sci

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The coefficient of restitution (COR) is used to estimate the equivalent free fall drop height of packaging during handling and transportation. Various experimental studies were designed to explore factors affecting the conversion of the COR to equivalent free fall drop height. These factors include the number of drops, drop height, drop orientation, drop base, temperature and humidity on the COR. The results indicate that the number of drops and drop orientation are the two most influential factors affecting COR values. As the package undergoes more drops, the COR increases. Among the various orientations, the COR is largest for flat drops, followed by edge and corner orientations. Within flat drops, a smaller impact area results in a smaller COR. Manufacturing joints and the flats, edges and corners adjacent to manufacturing joints tend to yield smaller COR values. A COR correction matrix was developed to correct the conventional COR calculation. This matrix allows engineers to refine COR values based on the number of drops and drop orientations in the field. The matrix‐corrected equivalent free fall drop heights demonstrated an average accuracy of 96%. Compared to the conventional COR calculation method, it effectively reduces errors by a factor of 2–3.

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Experimental study of the effect of temperature on the coefficient of restitution of steel balls impact to some industrial metal sheets at elevated temperatures

Cited by 10 publications

References 15 publications

Energy Dissipation Analysis for Elastoplastic Contact and Dynamic Dashpot Models

Energy Dissipation Analysis for Elastoplastic Contact and Dynamic Dashpot Models

Parameters Optimization and Energy Absorption Evaluation of the Steel Ball Friction Energy Absorber

Exploring factors affecting the conversion of the coefficient of restitution to equivalent free fall drop height

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