In-situ stress measurement of single and multilayer thin-films used in x-ray astronomy optics applications

2017 ◽  
Author(s):  
David M. Broadway ◽  
Danielle N. Gurgew ◽  
Stephen L. O'Dell ◽  
Brian D. Ramsey
Keyword(s):  
Thin Films ◽  
Stress Measurement ◽  
In Situ Stress ◽  
Multilayer Thin Films ◽  
X Ray ◽  
In Situ Stress Measurement

An instrument for in-situ stress measurement in thin films during growth

2000 ◽  
Vol 128-129 ◽  
pp. 474-478 ◽  
Author(s):  
C Fitz ◽  
W Fukarek ◽  
A Kolitsch ◽  
W Möller
Keyword(s):  
Thin Films ◽  
Stress Measurement ◽  
In Situ Stress ◽  
In Situ Stress Measurement

A Comprehensive Approach to in Situ Stress Measurement

1985 ◽  
Vol 29 ◽  
pp. 29-35 ◽  
Author(s):  
R. A. Holt
Keyword(s):  
Stress Measurement ◽  
In Situ Stress ◽  
Grain Structure ◽  
X Ray ◽  
In Situ Stress Measurement ◽  
New Instrument ◽  
Recent Developments ◽  
Position Sensitive ◽  
Position Sensitive Detectors

Recent developments in position sensitive detectors (PSD's), solid state power and computer technologies make it possible to design accurate instruments for in-situ stress measurement. Such instruments require compromises in the interests of portability, size and speed stiich may limit accuracy and/or versatility. Furthermore, extraction of a stress tensor from X-ray data is not always straightforward and considerable research is required before an instrument for X-ray stress measurement can be treated as a “black box” to be given to an uneducated operator.The development of a new instrument for in-situ stress measurement is described in this paper. It was conceived as a field instrument with two position-sensitive proportional counters (PSPC's) for use in the single exposure mode (SET), and incorporates precise angular qontrol of the incident X-ray beam and data analysis to eliminate irregular Bragg peaks owing to coarse grain structure, An experimental instrument was built tc test the concept (1).

In Situ Stress Measurement and Inversion in Deep Roadway

2013 ◽  
Vol 734-737 ◽  
pp. 759-763 ◽  
Author(s):  
Yong Li ◽  
Yun Yi Zhang ◽  
Ren Jie Gao ◽  
Shuai Tao Xie
Keyword(s):  
Field Measurement ◽  
Stress Measurement ◽  
Measurement Data ◽  
Back Analysis ◽  
In Situ Stress ◽  
Deep Mine ◽  
Accuracy Requirement ◽  
Initial Stress Field ◽  
In Situ Stress Measurement

Jixi mine area is one of the early mined areas in China and it's a typical deep mine. Because of large deformation of underground roadway and dynamic disasters occurred frequently in this mine, five measurement points of in-situ stress in this mine was measured and then analyzed with inversion. Based on these in-situ stress measurement data, numerical model of 3D in-situ stress back analysis was established. According to different stress fields, related analytical samples of neural network were given with FLAC program. Through the determination of hidden layers, hidden nodes and the setting of parameters, the network was optimized and trained. Then according to field measurement of in-situ stress, back analysis of initial stress field was conducted. Compared with field measurement, with accuracy requirement satisfied, it shows that the in-situ stress of rock mass obtained is basically reasonable. Meanwhile, it proves that the measurement of in-situ stress can provide deep mines with effective and rapid means, and also provide reliable data to optimization of deep roadway layout and supporting design.

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