Prediction of Tube-Tubesheet Galvanic Corrosion Using Finite Element and Wagner Number Analyses

2009 ◽  
pp. 136-136-22 ◽  
Author(s):  
JR Scully ◽  
HP Hack
Keyword(s):  
Finite Element ◽  
Galvanic Corrosion

A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints

2021 ◽  
Vol 883 ◽  
pp. 97-104
Author(s):  
Sven Harzheim ◽  
Christian Steinfelder ◽  
Thomas Wallmersperger ◽  
Alexander Brosius
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Contact Area ◽  
Galvanic Corrosion ◽  
Element Model ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Short Period ◽  
Bearing Behavior ◽  
Joint Integrity

Corrosion is a major cause for the failure of metallic components in various branches of the industry. Depending on the corrosion severity, the time until failure of the component varies. On the contrary, a study has shown that certain riveted metal joints, exposed to a short period of mechanical loading and corrosion, have greater fatigue limits. This study gives rise to the question how different corrosion exposure times affect joint metallic components. In the present research, a theoretical approach is developed in order to evaluate the influence of galvanic corrosion on joint integrity of clinched metal joints. At first, the framework for modeling galvanic corrosion is introduced. Furthermore, a simulative investigation of a clinching point is carried out based on the assumption that corrosion leads to a reduction of the contact area which leads to a local increase in contact pressure. For this purpose, the stiffness values of individual elements in a finite element model are reduced locally in the contact area of the undercut and the contact stress along a path is evaluated. Summarizing, a modeling approach is introduced to investigate corrosion effects on load-bearing behavior of clinched joints.

scholarly journals Finite Element Modeling and Mechanical Testing of Metal Composites Made by Composite Metal Foil Manufacturing

2019 ◽  
Vol 3 (3) ◽  
pp. 81 ◽  
Author(s):  
Butt ◽  
Ghorabian ◽  
Mohaghegh ◽  
Shirvani
Keyword(s):  
Finite Element ◽  
Galvanic Corrosion ◽  
Pure Copper ◽  
Element Model ◽  
Layered Composite ◽  
Metal Foil ◽  
Metal Foils ◽  
Flexural Testing ◽  
Time Required ◽  
Aluminum 1050

Foils of aluminum 1050 H14 ½ hard temper and 99.9% copper with 500-micron thickness have been used to manufacture similar and dissimilar composites by composite metal foil manufacturing (CMFM). The metal foils are bonded to each other using a special 80% zinc and 20% aluminum by weight brazing paste. A 3D finite element model has been developed to numerically analyze the time required to heat the metal foils so that a strong bond can be developed by the paste. The numerical simulations run in ANSYS 19.1 have been validated through experiments and rectangular layered composite products have been developed for flexural testing. The flexural test results for layered Al and Al/Cu composites are compared with solid samples of Al 1050 and 99.9% pure copper made by subtractive method. The results show that the layered Al composite is 5.2% stronger whereas the Al/Cu sample is 11.5% stronger in resisting bending loads compared to a solid Al 1050 sample. A higher bend load indicates the presence of a strong intermetallic bond created by the brazing paste between the metal foils. Corrosion testing was also carried out on the composite samples to assess the effect of corrosion on flexural strength. The tests revealed that the composites made by CMFM are not affected by galvanic corrosion after 7 days of testing and the flexural loads remained consistent with composites that were not immersed in a solution of distilled water and NaCl.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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