Corrosion models of a mounded horizontal pressure vessel in a probabilistic approach
			
	
 
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				Wydział inżynierii Lądowej i Środowiska, Politechnika Gdańska, Poland
				 
			 
										
				
				
			
			These authors had equal contribution to this work
			 
		 		
				
		
		 
			
			
			
			 
			Submission date: 2024-06-23
			 
		 		
		
		
		
			
			 
			Acceptance date: 2024-09-10
			 
		 		
		
		
			
			 
			Publication date: 2025-09-16
			 
		 			
		 
	
							
					    		
    			 
    			
    				    					Corresponding author
    					    				    				
    					Mateusz  Sondej   
    					Wydział inżynierii Lądowej i Środowiska, Politechnika Gdańska, Gabriela Narutowicza 11/12, 80-233, Gdańsk, Poland
    				
 
    			
				 
    			 
    		 		
			
																	 
		
	 
		
 
 
Archives of Civil Engineering 2025;71(3):431-445
		
 
 
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ABSTRACT
The computations of fuel tanks are bound to cover uncertainties related to geometric and material imperfections, post-welding stresses, non-uniform settlement, and shell degradation due to corrosion. The paper compares four different methods of tank corrosion description: a uniform reduction of the sheet thickness of the entire shell, degradation described by an angle correlated with its partial fuel filling, corrosion patterns defined by appropriately selected trigonometric functions, and an advanced non-homogeneous model using theoretical random fields. All corrosion patterns were numerically investigated to identify their impact on structural response. The computations were carried out for a simplified numerical model of a mounded horizontal pressure vessel. The Point Estimate Method (PEM) was used to estimate the mean value and standard deviation of the shell critical force. The probabilistic approach allows to assess structural reliability and makes it possible to optimize the structure. It has been shown that the optimal variant of corrosion description, easy for engineering applications, is the uniform reduction of the shell thickness.