scholarly journals Janssen ratio in granular solid measured by photoelastic method

2017 ◽  
Vol 66 (10) ◽  
pp. 104501
Author(s):  
Zong Jin ◽  
Zhou Zhi-Gang ◽  
Wang Wen-Guang ◽  
Zhang Sheng ◽  
Lin Ping ◽  
...  
Keyword(s):  
Photoelastic Method ◽  
Granular Solid

The Scope and Limitations of the Photoelastic Method of Stress Analysis

1953 ◽  
Vol 57 (507) ◽  
pp. 125-140 ◽  
Author(s):  
H. T. Jessop
Keyword(s):  
Stress Analysis ◽  
Safety Factor ◽  
Photoelastic Method ◽  
Considerable Difficulty ◽  
Distribution Of Stress

The problem of determining the distribution of stress over the various components of a structure such as an aircraft frame is one which has always presented considerable difficulty. For a large proportion of the components calculations of the stresses can only be carried out on the basis of assumptions and approximations, the effects of which cannot be estimated with any degree of accuracy and, since considerations of size and weight impose limitations upon the employment of a large safety factor, there has always existed a need for some practical means of checking the results of calculations or of obtaining more reliable estimates of the stresses.

High-Speed Capturing of Stress Distribution of Workpiece under Ultrasonically Assisted Cutting Condition

2014 ◽  
Vol 1017 ◽  
pp. 747-752
Author(s):  
Hiromi Isobe ◽  
Keisuke Hara
Keyword(s):  
Stress Distribution ◽  
Cutting Force ◽  
High Speed ◽  
Cutting Tool ◽  
Light Emission ◽  
Cutting Speed ◽  
Cutting Condition ◽  
Photoelastic Method ◽  
Intermittent Cutting ◽  
Ultrasonic Vibration Cutting

This paper reports the stress distribution inside the workpiece under ultrasonic vibration cutting (UVC) condition. Many researchers have reported the improvement of tool wear, burr generation and surface integrity by reduction of time-averaged cutting force under UVC condition. However general dynamometers have an insufficient frequency band to observe the processing phenomena caused by UVC. In this paper, stress distribution inside the workpiece during UVC was observed by combining the flash light emission synchronized with ultrasonically vibrating cutting tool and the photoelastic method. Instantaneous stress distribution during UVC condition was observed. Because UVC induced an intermittent cutting condition, the stress distribution changed periodically and disappeared when the tool leaved from the workpiece. It was found that instantaneous maximum cutting force during UVC condition was smaller than quasi-static cutting force during conventional cutting when the cutting speed was less than 500 mm/min.

Studies in Three-Dimensional Photoelasticity Torsional Stresses by Oblique Incidence

1944 ◽  
Vol 11 (4) ◽  
pp. A229-A234
Author(s):  
Max M. Frocht
Keyword(s):  
Oblique Incidence ◽  
Three Dimensional ◽  
Complete Agreement ◽  
Stress System ◽  
Pure Torsion ◽  
Photoelastic Method ◽  
Stress Components ◽  
Single Stress ◽  
Stress Patterns ◽  
Maximum Stresses

Abstract In this paper a photoelastic method is described for the study of stresses in cylindrical shafts due to pure torsion. The basic photoelastic equation governing this case is derived. It is shown that the maximum stresses, i.e., the boundary stresses, can be determined from a single stress pattern, and that the two stress components which define the complete stress system in pure torsion at an interior point can be determined from two stress patterns obtained from one section of a shaft into which the pure-torsion system has been frozen, employing to this end the Drucker-Mindlin suggestion of oblique incidence. The method is applied to a circular shaft, and the experimental results are found to be in complete agreement with the theory.

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