EP-1427: A comparative study of the normal oesophageal wall thickness based on 3DCT, 4DCT and CBCT

In this paper, differences by using selected three typical specifications—DL/T 5141-2001 (Chinese), ASCE No.79 in the version of 1993(American) and ASCE No.79 in the version of 2012 (American)—in structural design of exposed steel penstock were explored. A practical example about exposed penstock laid on ground applied in hydropower station was also used to analyze specifications clearly. The result shows that the main differences between Chinese and American specifications are allowable stress and load combination. The former is direct factor of calculating exposed penstock shell thickness. Therefore, ASCE No.79 (2012) designs the minimum wall thickness, followed by DL/T 5141-2001 and the last is ASCE No.79 (1993), which is correspondingly contrary to sort by allowable stress. Basically, ASCE No.79 (2012) defines lower safety coefficient for exposed penstock, which is identical with authoritative rules of pressure vessels in the U.S.A and EU. The safety of DL/T 5141-2001 has been proved via rich engineering experience and this specification is recommended for Chinese projects. Besides, ASCE No.79 (2012) is recommended.

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Comparative Study of Continuous Wave and Pulse Wave Electromagnetic Acoustic Resonance for the Measurement of Pipe Wall Thickness

Journal of the Japan Society of Applied Electromagnetics and Mechanics ◽

10.14243/jsaem.26.312 ◽

2018 ◽

Vol 26 (2) ◽

pp. 312-319 ◽

Cited By ~ 1

Author(s):

Hongjun SUN ◽

Ryoichi URAYAMA ◽

Fumio KOJIMA ◽

Mitsuo HASHIMOTO ◽

Tetsuya UCHIMOTO ◽

...

Keyword(s):

Comparative Study ◽

Wall Thickness ◽

Pulse Wave ◽

Continuous Wave ◽

Pipe Wall ◽

Acoustic Resonance ◽

Pipe Wall Thickness

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Comparative study of wall thickness change at deep drawing of box-shaped product using flat restriction bars

Scientific Letters of Rzeszow University of Technology - Mechanics ◽

10.7862/rm.2013.39 ◽

2013 ◽

Vol 30 (85(4/2013)) ◽

pp. 431-443

Author(s):

Juraj Hudák ◽

Miroslav Tomáš

Keyword(s):

Comparative Study ◽

Wall Thickness ◽

Deep Drawing ◽

Thickness Change

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Laser fusion microballoon wall‐thickness measurements: A comparative study

Journal of Applied Physics ◽

10.1063/1.323763 ◽

1977 ◽

Vol 48 (3) ◽

pp. 1223-1228 ◽

Cited By ~ 9

Author(s):

Gerald M. Halpern ◽

Joshua Varon ◽

Dennis C. Leiner ◽

Duncan T. Moore

Keyword(s):

Comparative Study ◽

Wall Thickness ◽

Laser Fusion ◽

Thickness Measurements

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Comparative measurements on autofrettaged cylinders with large Bauschinger reverse yielding zones

The Journal of Strain Analysis for Engineering Design ◽

10.1243/0309324001514224 ◽

2000 ◽

Vol 35 (6) ◽

pp. 459-469 ◽

Cited By ~ 24

Author(s):

A. M Venter ◽

R R de Swardt ◽

S Kyriacou

Keyword(s):

Neutron Diffraction ◽

Comparative Study ◽

Wall Thickness ◽

Residual Strain ◽

Bauschinger Effect ◽

Theoretical Modelling ◽

Strain Stress ◽

Reverse Yielding ◽

Stress States ◽

Hoop Stresses

A comparative study to map the residual strain/stress states through the walls of autofrettaged thick-walled steel cylinders has been conducted with neutron diffraction, Sachs boring and the compliance methods. Test samples with different wall thickness ratios were prepared to have significant amounts of reverse yielding due to the Bauschinger effect. All three methods indicate that the autofrettage action primarily influenced the hoop stresses, which varied rapidly close to the bores from compressive to tensile within the first half of the wall thickness. Quantitatively, results from the neutron diffraction and Sachs boring techniques compare favourably across large regions of the cylinder walls, while the compliance results showed different features. The existence of reverse yielding close to the cylinder bores has been sensed to different magnitudes and distances from the bores. Plastically yielded material regions identified from the neutron diffraction results correlated well with theoretical modelling.

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