A Statistical Study on the Effect of Local Brittle Zones (LBZs) on the Fracture Toughness (Crack Tip Opening Displacement) of Multipass Welded Joints

2009 ◽  
pp. 264-264-27 ◽  
Author(s):  
S Machida ◽  
H Yoshinari ◽  
Y Suzuki
Keyword(s):  
Fracture Toughness ◽  
Welded Joints ◽  
Statistical Study ◽  
Crack Tip ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Crack Tip Opening

Experimental Study on CTOD Fracture Toughness of Welded Joints of Low Temperature Steel

2011 ◽  
Vol 328-330 ◽  
pp. 1272-1276 ◽  
Author(s):  
Zong Tao Fang ◽  
Bo Sun ◽  
Chun Run Li
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Welded Joints ◽  
Welding Process ◽  
Offshore Platform ◽  
Fracture Toughness Test ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Welding Procedure ◽  
Crack Tip Opening

According to BS7448 fracture toughness test standard, crack tip opening displacement (CTOD) for ASTM A333 Gr.6 low temperature steel which is used in offshore platform were carried out in low temperature (0°C, -29°C). Three point bending tests were conducted on the specimens, the dimension of which is B×2B (B is the thickness) and notch direction is NP. The final value of CTOD was calculated by P-V curves of both the welds and HAZ (heat affected zone). And the experimental results were analyzed and discussed in the paper. The low temperature steel welded joints show good low temperature toughness, the selected welding procedure is applied to construction of pipelines.The CTOD value of HAZ is larger than weld metal and weld is the weakest position in the whole structure. The experiment results provide an important basis for the choice of welding method and welding process parameters, ECA assessment and construction of offshore platform.

CTOD Specimen’s Fatigue Crack Prefabricated Test for Bridge Steel

2011 ◽  
Vol 71-78 ◽  
pp. 5034-5037
Author(s):  
Qi Ming Yu ◽  
Hao Liang Sa ◽  
Qian Long Yang ◽  
Pei Ao ◽  
Xiao Jing Liao ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Fatigue Crack ◽  
Crack Tip ◽  
Fracture Toughness Test ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Toughness Test ◽  
Bridge Steel ◽  
Crack Tip Opening ◽  
Different Thickness

According to the BS7448 fracture toughness test standard and DNV-OS-C401,this dissertation conducted a CTOD(crack tip opening displacement) fatigue crack precast test with the used steel Q370qE in bridge.Respectively tested different thickness mather materials’condition of fatigue crack,and analysis the test’s results,thus obtained the related conclusions.

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