scholarly journals Influence of variable cutting surface contact area on the components of cutting forces and accuracy

2021 ◽  
pp. 20-24
Author(s):  
Esreb DZHEMILOV
Keyword(s):  
Contact Area ◽  
Cutting Forces ◽  
Applied Pressure ◽  
Contact Areas ◽  
Cutting Surface ◽  
Surface Contact ◽  
Surface Contact Area

The article discusses the process of diamond honing of conical holes. The purpose of the article is to identify the dependence of power in the process of cutting and the effect of changing the contact areas of the components of the cutting forces. The experiments were carried out on a developed installation to determine the cutting ability of diamond honing stones. Depen- dences of linear removal of steel 50 and steel 45 on the applied pressure have been established. Based on the data obtained, it can be concluded that if the value of the Py index goes beyond the limits of pure contact, then this leads to the seizure of surfaces and a deterioration in the quality of processing.

Skeleton Runner Roughness and Surface Contact Area Influence on Sliding Ability: Field Experiments

2019 ◽  
Vol 800 ◽  
pp. 303-307 ◽  
Author(s):  
Janis Lungevics ◽  
Ernests Jansons ◽  
Karlis Agris Gross
Keyword(s):  
Surface Roughness ◽  
Contact Area ◽  
Field Experiments ◽  
Contact Areas ◽  
Surface Contact ◽  
Surface Contact Area

Scientists and sport athletes are constantly seeking for the methods which could improve surface sliding ability on ice. Modifications of contact area and surface roughness are relatively easy but not yet fully understood methods for sliding ability improvements. This research contains information of how one can perform on-field experiments with skeleton sleigh to determine the influence of surface contact area and roughness on sliding ability. Two types of surface roughness i.e. polished (3000 grain sandpaper) and scratched (600 grain sandpaper) are compared using three different contact areas. Obtained data showed that rougher surfaces tend to slide faster if contact area is larger but the effect reverses if contact area is reduced.

scholarly journals Strontium Oxide Deposited onto a Load-Bearable and Porous Titanium Matrix as Dynamic and High-Surface-Contact-Area Catalysis for Transesterification

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 973 ◽  
Author(s):  
Han Lee ◽  
Jiunn-Der Liao ◽  
Mu Lee ◽  
Bernard Liu ◽  
Wei-En Fu ◽  
...  
Keyword(s):  
Contact Area ◽  
Porous Matrix ◽  
Porous Titanium ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Strontium Oxide ◽  
Chemical Structures ◽  
Surface Contact ◽  
Surface Contact Area ◽  
Highly Porous

Strontium oxide (SrO) deposited onto a porous titanium (Ti)-based scaffold (P-Ti) is a promising and novel approach for high-throughput transesterification. Notably, a highly porous and calcinated scaffold provides a load-bearable support for a continuous process, while the calcinated SrO catalyst, as it is well distributed inside the porous matrix, can extend its surface contact area with the reactant. In this work, the formation of transesterification reaction with the conversion and production of olive oil to biodiesel inside the porous matrix is particularly examined. The as-designed SrO-coated porous titanium (Ti)-based scaffold with 55% porosity was prepared via a hydrothermal procedure, followed by a dip coating method. Mechanical tests of samples were conducted by a nanoindentator, whereas the physical and chemical structures were identified by IR and Raman Spectroscopies. The results implied that SrO catalysts can be firmly deposited onto a load-bearable, highly porous matrix and play an effective role for the transesterification reaction with the oil mass. It is promising to be employed as a load-bearable support for a continuous transesterification process, such as a process for batch or continuous biodiesel production, under an efficient heating source by a focused microwave system.

Use of Plantar Contact Area to Predict Medial Longitudinal Arch Height During Walking

2006 ◽  
Vol 96 (6) ◽  
pp. 489-494 ◽  
Author(s):  
Thomas G. McPoil ◽  
Mark W. Cornwall
Keyword(s):  
Contact Area ◽  
Sensor Data ◽  
Medial Longitudinal Arch ◽  
Arch Height ◽  
Plantar Surface ◽  
Longitudinal Arch ◽  
Surface Contact ◽  
Surface Contact Area ◽  
Arch Index ◽  
Vertical Height

A study was conducted to determine whether plantar surface contact area measures calculated from footprints collected during walking can be used to predict the height of the medial longitudinal arch. Thirty healthy women participated in the study. Arch height was determined by the distance from the navicular tuberosity to the floor and by the “bony” arch index. Dynamic plantar surface contact area was recorded using a pressure platform as the subjects walked across a 12-m walkway. The arch index and the total plantar surface contact area were determined from the pressure sensor data. The results indicated that plantar surface contact area could be used to estimate only approximately 27% of the height of the medial longitudinal arch as determined by navicular tuberosity height and the bony arch index. These findings demonstrate the inability of the clinician to predict the vertical height of the medial longitudinal arch on the basis of the amount of foot plantar surface area in contact with the ground during walking. (J Am Podiatr Med Assoc 96(6): 489-494, 2006)

Thermal Injury from Mastoid Bone Burrs

1978 ◽  
Vol 87 (1) ◽  
pp. 43-49 ◽  
Author(s):  
William H. Call
Keyword(s):  
Contact Area ◽  
Thermal Injury ◽  
Rotation Speed ◽  
Applied Pressure ◽  
Haversian Canal ◽  
Operative Field ◽  
Continuous Irrigation ◽  
Area Increase ◽  
Surface Contact Area ◽  
Tissue Grafts

Marked bone temperature elevations and surface osteocyte necrosis result from cutting and diamond burrs used without continuous irrigation. Temperatures generated may injure the facial nerve even if drilling is carried on a millimeter or more distant from the nerve. Irrigation of the operative field maintains bone and nerve temperatures at safe levels. Cutting and diamond burrs obey different thermodynamic principles. Higher rotation speeds, greater applied pressures and greater surface contact area increase cutting burr thermogenesis. Burrs with more flutes generate greater heat than those with fewer flutes. Diamond burr heat generation varies in proportion to applied pressure, but is independent of rotation speed or contact area. Haversian canal blood vessels do not contribute to postoperative revascularization. Rather, vessels immigrate from adjacent intact periosteum, penetrating arterioles and exposed marrow. Surface thermal injury does not impede revascularization and should not impair the healing of tissue grafts applied to the bone surface.

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