Experimental and computer-aided investigations and optimization of stress-relieving notches

1978 ◽  
Vol 13 (3) ◽  
pp. 149-156 ◽  
Author(s):  
W P Steinchen
Keyword(s):  
Stress Concentration ◽  
Cross Section ◽  
Maximum Concentration ◽  
Circular Cross Section ◽  
Stress Relieving ◽  
Computer Aided ◽  
Machine Elements

In many designs, it is desirable to economize in weight and minimize stress concentration. After a general demonstration of the effect of additional notches or holes in relieving the maximum concentration of stress in notched machine elements, extensive quantitative investigations were made for bars and shafts of circular cross-section subjected to tensile, bending and torsional loadings.

Numerical Analysis and Optimization of Flat Ends Parameters in Pressure Vessels with Rectangular Shape

2014 ◽  
Vol 621 ◽  
pp. 107-112 ◽  
Author(s):  
Bogdan Szybiński ◽  
Paweł Romanowicz
Keyword(s):  
Numerical Analysis ◽  
Stress Concentration ◽  
Cross Section ◽  
Cross Sections ◽  
Rectangular Cross Section ◽  
Circular Cross Section ◽  
Pressure Vessels ◽  
Main Interest ◽  
Rectangular Shape ◽  
Minimum Stress

Cylindrical pressure vessels with circular cross section are commonly used in the construction of various pressure apparatus; however in certain cases other cross sections are applied. The vessels with rectangular and elliptical perpendicular cross section are of the main interest and certain formulas for their calculations are stated in the respective codes [1, 2]. In these appliances flat ends of various shapes are usually used as the vessels caps. Similarly, as for the cylindrical boilers, flat end plates with stress relieve grooves are recommended. Like in the flat ends for cylindrical pipes certain variation of the groove parameters is possible but again no clear suggestion is given how to choose the optimal groove parameters providing the minimum stress concentration [3]. In this paper the numerical analysis and optimization of the admitted by code [1] groove parameters is presented for the pipe with the rectangular cross section subjected to the internal pressure.

SAF file: It's really three dimensional file

2018 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Prof. Dr. Jamal Aziz Mehdi
Keyword(s):  
Cross Section ◽  
Root Canal ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Circular Motion ◽  
Root Canal Treatment ◽  
Metal Core ◽  
Rotating Blade

The biological objectives of root canal treatment have not changed over the recentdecades, but the methods to attain these goals have been greatly modified. Theintroduction of NiTi rotary files represents a major leap in the development ofendodontic instruments, with a wide variety of sophisticated instruments presentlyavailable (1, 2).Whatever their modification or improvement, all of these instruments have onething in common: they consist of a metal core with some type of rotating blade thatmachines the canal with a circular motion using flutes to carry the dentin chips anddebris coronally. Consequently, all rotary NiTi files will machine the root canal to acylindrical bore with a circular cross-section if the clinician applies them in a strictboring manner

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