An Experimental and Theoretical Study of the Normal Coefficient of Restitution for Marble Spheres

Yang, Ye; Zeng, Yawu; Thoeni, Klaus; Giacomini, A.

doi:10.1007/s00603-018-1709-5

Cited by 30 publications

(14 citation statements)

References 42 publications

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“…First, an increase in E COR,BE could be achieved by improving the hardness of the materials used for the equipment, as seen in Mode I of Figure 2(b). An impact test between two blocks (rock) also indicated that with an increase in the Schmidt hardness, velocity COR increased (Ye et al 2019). It is reasonable to assume that this same trend would apply in a collision between a rock and metal.…”

Section: Mitigation Measures For Rockfall Hazard In Mining Of Sdcssmentioning

confidence: 92%

Risk mitigation for rockfall hazards in steeply dipping coal seam: a case study in Xinjiang, northwestern China

Wang

et al. 2021

Geomatics, Natural Hazards and Risk

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Many recent examples have shown that rockfalls can occur in underground steep coal mines. The stratigraphic circumstances, block formation mechanism, and cumulative damage effects of rockfalls in the longwalls of a steeply dipping coal seam (SDCS) make them detrimental to workplace safety. Therefore, this study examined an approach for mitigating rockfall hazards in SDCSs. A passive mesh system was installed to prevent the propagation of rockfalls, which decreased the number of collisions between the falling rocks and mining equipment. The interactions of the falling rocks and passive mesh were studied using a series of full-scale numerical impact tests. The following conclusions could be drawn. The displacement of the mesh increased with the rockfall kinetic energy, showing the characteristic of strain hardening. The peak stress appeared near the contact area between the rockfall and mesh, and it spread to the mesh edge in an X-shaped pattern. Stress concentrations were likely to occur in areas that were in direct contact with the mesh and mesh edges. The displacement of the mesh increased when the incidence angle increased, and the number of mesh cells entering the plastic state increased significantly. The internal energy ratio increased with an increase in the incidence angle, indicating that a greater incidence angle led to a larger amount of kinetic energy being transferred from the block into the internal energy of the passive mesh. Finally, the method was verified by comparing the numerical test with the on-site damaged equipment. The high replacement frequency of a passive mesh system and the annual fatality rate in the longwalls of SDCS were significantly improved. This study provided the design for a drapery mesh system for rockfall disaster prevention, particularly the mitigation of rockfall hazard risks in underground SDCSs.

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Section: Mitigation Measures For Rockfall Hazard In Mining Of Sdcssmentioning

confidence: 92%

Risk mitigation for rockfall hazards in steeply dipping coal seam: a case study in Xinjiang, northwestern China

Wang

et al. 2021

Geomatics, Natural Hazards and Risk

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“…In order to accurately determine the restitution coefficient of the particles, the data selected the highintensity impact stage where energy dissipation occurs. The restitution coefficient of the particles is calculated by Equation (5)(6), as shown in Table 2. From the restitution coefficient of different material particles, it can be seen that the restitution coefficient of PP, acrylic, and POM is about 0.9, close to 1, which is similar to the complete elastic impact, which corresponds to the characteristics of more collisions and longer waveform duration.…”

Section: Particle Restitution Coefficient and Its Relationship With D...mentioning

confidence: 99%

“…When the particle restitution coefficient is 0<e<1, the impact is inelastic [4] . Ye et al [5][6] used the method of acoustic frequency sampling to study and determine the influence of factors such as the size of the gravel, the impact speed, and the elastic characteristics of the plate on the normal restitution coefficient during the impact of granite, marble, and slope. Wang et al [7] expounded the definition of particle restitution coefficient, the test device, and its application in the field of agricultural food, and summarized the influence of moisture content, impact speed, impact angle, and material of impact body on particle restitution coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [7] expounded the definition of particle restitution coefficient, the test device, and its application in the field of agricultural food, and summarized the influence of moisture content, impact speed, impact angle, and material of impact body on particle restitution coefficient. For commercial materials, scholars have measured the restitution coefficient of ceramic and polymer particles, and studied the influence of particle diameter and shape on the restitution coefficient of various materials [8][9][10] . In summary, the research on more restitution coefficients mainly focuses on rolling stones and crop seeds.…”

Section: Introductionmentioning

confidence: 99%

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Restitution coefficient of various particles based on acoustic technology

Chai

Zhong

Liu

et al. 2023

J. Phys.: Conf. Ser.

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The restitution coefficient is used to characterize the energy loss in particle impact, which is an important parameter for discrete element simulation and mechanical system motion analysis. However, the restitution coefficient of many materials needs to be determined, and the key material properties affecting the restitution coefficient are still unclear. In this paper, the acoustic frequency sampling method was used to study the restitution coefficients of 10 representative particles. The effects of material density and specific strength on the restitution coefficient and the relationship between the restitution coefficient and the damping coefficient were investigated. The results show that the particle restitution coefficient is inversely proportional to the density except for aluminium. The relationship between particle restitution coefficient and specific strength is not significant.

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“…The ball is dropped it caused by friction between the ball and the oor (Abdullah, 2017). Generally, stress in waves appears during the collision which caused energy lose and the coe cient of restitution will decrease (Ye et al, 2019;Wu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Determination The Coefficient of Restitution in Object as Temperature Function in Partially Elastic Collision Using Phyphox Application on Smartphone

Hikmatiar

Ishafit²,

Wahyuni³

2019

sci. technol. indones.

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This research aims to determine the coefficient of restitution in object experiencing partially elastic collision when the object falls free using the phyphox application on smartphone. In terms of experiment, this experiment was carried out five times with different temperature. The smartphone is connected on PC through the same wifi network or using tethering by entering the search address that available on phyphox application. After that, the smartphone placed on the board that used as a base when the object dropped, then the object released from the certain height. Data collecting process started by running the phyphox application through a PC to collect the measurement data. The data collected on smartphone is exported to Ms. Excel to fit the data and then the results are plotted in graphical form. The result of the analysis shows the coefficient of restitution value of the object that had variations based on experiment with each temperatures at 32 oC, 28 oC, 24 oC, 20 oC 18 oC and the coefficient of restitution values are 0.889 ± 0.006, 0.890 ± 0.008, 0.891 ± 0.003, 0.892 ± 0.003 and 0.893 ± 0.003. The result of research shows that the lower of the temperature so theres increasing on the coefficient of restitution. So that the coefficient of restitution has avarage’s value is 0.891±0.002. Keywords: coefficient of restitution ,smartphone, phyphox application

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An Experimental and Theoretical Study of the Normal Coefficient of Restitution for Marble Spheres

Cited by 30 publications

References 42 publications

Risk mitigation for rockfall hazards in steeply dipping coal seam: a case study in Xinjiang, northwestern China

Risk mitigation for rockfall hazards in steeply dipping coal seam: a case study in Xinjiang, northwestern China

Restitution coefficient of various particles based on acoustic technology

Determination The Coefficient of Restitution in Object as Temperature Function in Partially Elastic Collision Using Phyphox Application on Smartphone

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