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You searched for subject:(Pressure vessels Cracking). Showing records 1 – 3 of 3 total matches.

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Florida International University

1. Pierola, Javier. Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel.

Degree: MS, Mechanical Engineering, 1993, Florida International University

The objective of this study is to present the mode I stress intensity factor distribution (SIF) along the crack-front for a wide array of semicircular and semi-elliptical surface cracks inside of a pressurized thick-walled cylinder. A three-dimensional finite element package ANSYS is used to evaluate the SIF for multicracked cylinder with number of cracks from n=1 to 128, the ratio of crack-depth to the wall thickness a/t=0.05 to 0.6, the ellipticity of the crack (the crack-depth to the semi-crack length) a/c=0.2 to 1.5, the ratio of the outer to the inner radius <em>ro/ ri</em>=2. A substructuring technique is introduced which solved a coarse model meshed with ten-node isoparametric elements and applied the resulting displacements in the boundary surface of a submodel which is built employing singular elements along the crack-front to produce the 1/√r singularity . The SIF is evaluated using nodal-displacement method. To validate the modeling and analysis procedure of the present results various configurations were solved using this method and compared to other finite element solutions. The present results were in very good agreement: less than 5 % comparing with Raju and Newman's results and within 8 % of Kirkhope's results. An empirical equation to calculate the maximum SIF, was developed in this study. The equation was obtained by nonlinear fitting of the finite element results and the error was within ± 5.7 %. Advisors/Committee Members: Cesar Levy, M. El-Sayed, K. Wu, M. Perl, M. Ebadian.

Subjects/Keywords: Pressure vessels; Cracking; Fracture mechanics; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pierola, J. (1993). Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel. (Thesis). Florida International University. Retrieved from http://digitalcommons.fiu.edu/etd/2514 ; 10.25148/etd.FI15103199 ; FI15103199

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Pierola, Javier. “Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel.” 1993. Thesis, Florida International University. Accessed August 22, 2019. http://digitalcommons.fiu.edu/etd/2514 ; 10.25148/etd.FI15103199 ; FI15103199.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Pierola, Javier. “Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel.” 1993. Web. 22 Aug 2019.

Vancouver:

Pierola J. Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel. [Internet] [Thesis]. Florida International University; 1993. [cited 2019 Aug 22]. Available from: http://digitalcommons.fiu.edu/etd/2514 ; 10.25148/etd.FI15103199 ; FI15103199.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pierola J. Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel. [Thesis]. Florida International University; 1993. Available from: http://digitalcommons.fiu.edu/etd/2514 ; 10.25148/etd.FI15103199 ; FI15103199

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Colorado School of Mines

2. AlShawaf, Ali Hamad. Hydrogen cracking and stress corrosion of pressure vessel steel ASTM A543.

Degree: PhD, Metallurgical and Materials Engineering, 2007, Colorado School of Mines

The purpose of conducting this research is to develop fundamental understanding of the weldability of the modern Quenched and Tempered High Strength Low Alloy (Q&T HSLA) steel, regarding the cracking behavior and susceptibility to environmental cracking in the base metal and in the heat affected zone (HAZ) when welded. A number of leaking cracks developed in the girth welds of the pressure vessel after a short time of upgrading the material from plain carbon steel to Q&T HSLA steel. The new vessels were constructed to increase the production of the plant and also to save weight for the larger pressure vessel. The results of this research study will be used to identify safe welding procedure and design more weldable material. A standardized weldability test known as implant test was constructed and used to study the susceptibility of the Q&T HSLA steel to hydrogen cracking. The charged hydrogen content for each weld was recorded against the applied load during weldability testing. The lack of understanding in detail of the interaction between hydrogen and each HAZ subzone in implant testing led to the need of developing the test to obtain more data about the weldability. The HAZ subzones were produced using two techniques: standard furnace and Gleeble® machine. These produced subzones were pre-charged with hydrogen to different levels of concentration. The hydrogen charging on the samples simulates prior exposure of the material to high humidity environment during welding process. Fractographical and microstructural characterization of the HAZ subzones were conducted using techniques such as SEM (Scanning Electron Microscopy). A modified implant test using the mechanical tensile machine was also used to observe the effects of the hydrogen on the cracking behavior of each HAZ subzone. All the experimental weldability works were simulated and validated using a commercial computational software, SYSWELD. The computational simulation of implant testing of Q&T HSLA with the previously used plain carbon steel and other currently used pressure vessel steels was successfully completed. The experimental and computational results of the Q&T HSLA steel agreed well with each other. The susceptibility of the Q&T A543 steel to stress corrosion cracking was investigated using the slow strain rate testing under different environments and conditions. Also, advanced corrosion study using the electrochemical impedance spectroscopy was done at different conditions. The corrosion study revealed that this A543 steel is prone to form pits in most of the conditions. The model results in the corrosion study were validated with the Gamry Echem Analyst software that A543 steel tends to form pits in the tested environment. Advisors/Committee Members: Liu, Stephen (advisor), Steele, John P. H. (committee member), Olson, D. L. (David LeRoy) (committee member), Mishra, Brajendra (committee member), Yu, Zhenzhen (committee member), Findley, Kip Owen (committee member).

Subjects/Keywords: Finite element modeling; Weldability; Stress corrosion cracking; Hydrogen cracking; Steel  – Weldability; Steel  – Stress corrosion; Hydrogen; Pressure vessels  – Cracking; Steel  – Welding

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

AlShawaf, A. H. (2007). Hydrogen cracking and stress corrosion of pressure vessel steel ASTM A543. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/17080

Chicago Manual of Style (16th Edition):

AlShawaf, Ali Hamad. “Hydrogen cracking and stress corrosion of pressure vessel steel ASTM A543.” 2007. Doctoral Dissertation, Colorado School of Mines. Accessed August 22, 2019. http://hdl.handle.net/11124/17080.

MLA Handbook (7th Edition):

AlShawaf, Ali Hamad. “Hydrogen cracking and stress corrosion of pressure vessel steel ASTM A543.” 2007. Web. 22 Aug 2019.

Vancouver:

AlShawaf AH. Hydrogen cracking and stress corrosion of pressure vessel steel ASTM A543. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2007. [cited 2019 Aug 22]. Available from: http://hdl.handle.net/11124/17080.

Council of Science Editors:

AlShawaf AH. Hydrogen cracking and stress corrosion of pressure vessel steel ASTM A543. [Doctoral Dissertation]. Colorado School of Mines; 2007. Available from: http://hdl.handle.net/11124/17080


ETH Zürich

3. Kraus, Andreas. Stress corrosion cracking of pressure vessel steels in high temperature water.

Degree: 1994, ETH Zürich

Subjects/Keywords: SPANNUNGSRISSKORROSION (MATERIALPRÜFUNG); KESSELBAU, DRUCKBEHÄLTER, REAKTOREN (MASSIVUMFORMUNG); HOCHTEMPERATURKORROSION (MATERIALPRÜFUNG); STRESS CORROSION CRACKING, SCC (MATERIALS TESTING); BOILERMAKING, PRESSURE VESSELS, REACTION VESSELS (FORMING); HIGH TEMPERATURE CORROSION (MATERIALS TESTING); info:eu-repo/classification/ddc/620; Engineering & allied operations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kraus, A. (1994). Stress corrosion cracking of pressure vessel steels in high temperature water. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/141630

Chicago Manual of Style (16th Edition):

Kraus, Andreas. “Stress corrosion cracking of pressure vessel steels in high temperature water.” 1994. Doctoral Dissertation, ETH Zürich. Accessed August 22, 2019. http://hdl.handle.net/20.500.11850/141630.

MLA Handbook (7th Edition):

Kraus, Andreas. “Stress corrosion cracking of pressure vessel steels in high temperature water.” 1994. Web. 22 Aug 2019.

Vancouver:

Kraus A. Stress corrosion cracking of pressure vessel steels in high temperature water. [Internet] [Doctoral dissertation]. ETH Zürich; 1994. [cited 2019 Aug 22]. Available from: http://hdl.handle.net/20.500.11850/141630.

Council of Science Editors:

Kraus A. Stress corrosion cracking of pressure vessel steels in high temperature water. [Doctoral Dissertation]. ETH Zürich; 1994. Available from: http://hdl.handle.net/20.500.11850/141630

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