scholarly journals NON DESTRUCTIVE EVALUATION OF RIB-TO-DECK FATIGUE CRACK IN DECK PLATE OF ORTHOTROPIC STEEL DECK SYSTEM BY THE PHASED ARRAY ULTRASONIC TESTING

2016 ◽  
Vol 72 (1) ◽  
pp. 206-219
Author(s):  
Hiromi SHIRAHATA ◽  
Takuma KAMIKURI
Keyword(s):  
Fatigue Crack ◽  
Ultrasonic Testing ◽  
Phased Array ◽  
Orthotropic Steel Deck ◽  
Non Destructive Evaluation ◽  
Deck Plate ◽  
Non Destructive ◽  
Steel Deck

scholarly journals Laboratory Study on Non-Destructive Evaluation of Polyethylene Liquid Storage Tanks by Thermographic and Ultrasonic Methods

CivilEng ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 823-851
Author(s):  
Amir Behravan ◽  
Matthew M. deJong ◽  
Alexander S. Brand
Keyword(s):  
Ultrasonic Testing ◽  
Visual Inspection ◽  
Phased Array ◽  
Road Maintenance ◽  
Storage Tanks ◽  
Ultrasonic Methods ◽  
Liquid Storage ◽  
Non Destructive Evaluation ◽  
Deicing Chemicals ◽  
Non Destructive

High-density polyethylene (HDPE) above-ground storage tanks (AST) are used by highway agencies to store liquid deicing chemicals for the purpose of road maintenance in the winter. A sudden AST failure can cause significant economic and environmental impacts. While ASTs are routinely inspected to identify signs of aging and damage, current methods may not adequately capture all defects, particularly if they are subsurface or too small to be seen during visual inspection. Therefore, to improve the ability to identify potential durability issues with HDPE ASTs, additional non-destructive evaluation (NDE) techniques need to be considered and assessed for applicability. Specifically, this study investigates the efficiency of using infrared thermography (IRT) as a rapid method to simultaneously examine large areas of the tank exterior, which will be followed by closer inspections with conventional and phased array ultrasonic testing (UT) methods. Results show that IRT can help to detect defects that are shallow, specifically located within half of the tank’s wall thickness from the surface. UT has the ability to detect all defects at any depth. Moreover, phased array UT helps to identify stacked defects and characterize each defect more precisely than IRT.

Fatigue Crack Behavior at Rib-To-Deck Weld Bead in Orthotropic Steel Deck

2014 ◽  
Vol 17 (10) ◽  
pp. 1459-1468 ◽  
Author(s):  
Xiaochen Ju ◽  
Kazuo Tateishi
Keyword(s):  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Cracks ◽  
Equivalent Stress ◽  
Weld Bead ◽  
Propagation Mechanism ◽  
Mode Iii ◽  
Orthotropic Steel Deck ◽  
Deck Plate ◽  
Steel Deck

One of the typical fatigue cracks observed in orthotropic steel deck is a through-thickness crack which penetrates and propagates along the weld bead. Moreover, according to some reports of the fatigue crack observed in some bridges, the fatigue crack sometimes changes its direction suddenly, and propagates to the rib wall and the deck plate. Such fatigue damage can cause the sudden decrease of stiffness of longitudinal rib. However, the propagation mechanism of the crack has not been investigated clearly. In this study, numerical studies on the through-thickness crack at rib-to-deck weld bead in the orthotropic steel deck were carried out. Finite element model (FEM) of an orthotropic deck with different through-thickness crack at rib-to-deck weld bead was created. In order to identify the propagation behavior of the fatigue crack, stress intensity factors for three deformation modes were estimated by the FE analysis (FEA) and the displacement extrapolation method. Based on the maximum energy release rate (MERR) criterion, the equivalent stress intensity factor and the crack direction were evaluated. From the numerical results, the crack direction change was found to be originated by the Mode II and Mode III deformation near the crack tip due to the out-of-plane bending of the rib wall along the crack.

The effect of variation in phased array element performance for Non-Destructive Evaluation (NDE)

Ultrasonics ◽  
2013 ◽  
Vol 53 (6) ◽  
pp. 1065-1078 ◽  
Author(s):  
David Duxbury ◽  
Jonathan Russell ◽  
Michael Lowe
Keyword(s):  
Phased Array ◽  
Array Element ◽  
Non Destructive Evaluation ◽  
Non Destructive
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