Experimental Measurement of Stress Distribution

2015 ◽  
Vol 816 ◽  
pp. 416-420 ◽  
Author(s):  
Milan Sapieta ◽  
Vladimir Dekys ◽  
Milan Uhríčik
Keyword(s):  
Stress Distribution ◽  
Infrared Camera ◽  
High Sensitivity ◽  
Experimental Stress ◽  
Flat Specimen ◽  
Constant Amplitude ◽  
Principal Stresses ◽  
Experimental Stress Analysis ◽  
The Face ◽  
Stress Invariant

The main purpose of this paper is to made experimental stress analysis of flat specimen. Specimens were cycles with constant amplitude loaded in order to maintain adiabatic conditions. Whole loading process of specimens was recorded by infrared camera with high sensitivity. Subsequently values of stress were according to equations for thermoelastic analysis evaluated on the face of specimens. Evaluate values of stress are equal to the sum of the principal stresses thus it is the first stress invariant.

scholarly journals Numerical and Experimental Photo Elastic Stress Analysis on a Epoxy Circular Disc

2019 ◽  
Vol 8 (3) ◽  
pp. 7868-7871
Keyword(s):  
Stress Distribution ◽  
Stress Analysis ◽  
Elastic Stress ◽  
Theory Of Elasticity ◽  
Circular Disc ◽  
Experimental Stress ◽  
Elastic Materials ◽  
Experimental Stress Analysis ◽  
The Face ◽  
Circular Disks

The main objective of the paper is to present elastic stress analysis on Epoxy circular disc. With the approach of theory of elasticity, the elastic stress distribution on the face of disc has been computed. To validate the stress distribution computed analytically , two specimen are prepared using photo elastic materials and tested them on a refractive poloariscope . The two specimens are circular disks . Stress are determined on disk by loading diametrically in polariscope. The experimental stress analysis is based on pattern, colour and counting of fringes obtained on the surface of disks when they are stressed in the prsence of Monochromatic lights of the polariscope. The stress distribution expressions are implemented in MATLAB and these qualities are being contrasted with the experimental qualities all together validate to Numerical method that we proposed in this paper.

scholarly journals Front Stress Distribution Under the Impact of Cutting Height to Caving Height Ratio in Extra-thick Longwall Top Coal Caving Technology

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Bui MANH TUNG ◽  
Nguyen VAN QUANG ◽  
Nguyen PHI HUNG ◽  
Vo NGOC DUNG ◽  
Do HOANG HIEP
Keyword(s):  
Stress Distribution ◽  
Peak Stress ◽  
Height Ratio ◽  
Research Orientation ◽  
Geological Conditions ◽  
The Face ◽  
New Research ◽  
Longwall Top Coal Caving ◽  
Cutting Height ◽  
The Impact

The extraction with higher cutting height for extra-thick seam is the new research orientation in longwall caving technology. Due to the increase of top coal thickness and of cutting height which leads to the change of cutting/caving height ratio, the rule of roof failure (including top coal caving) and the distribution of stress around the face alter correspondingly. This paper is based on the geological conditions of face 8102 of Tashan-DaTong mine, employing the numerical model by UDEC2D code, analysing the effect of cutting/caving height ratio on the law of stress distribution ahead of the face. When the ratio of cutting/caving height decreases and the cutting height increases, the results of the research have shown that: (i)- peak stress redistributes further ahead of the face and its value manifestly drops; (ii)- the plastic deformation ahead of face significant increases and the zone of plastic strain also expands. It is therefore concluded that the variation of cutting/caving height ratio results in the redistribution of roof pressure, which contributes to the control of roof failure and face stability.

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