Double-Torsion Measurements of the Brittle-to-Ductile Transition Temperature in Calcium Aluminosilicate Glasses

2016 ◽  
Vol 7 (4) ◽  
pp. 532-544 ◽  
Author(s):  
Luiz E. Ferri ◽  
Kyle C. Hoff ◽  
Shefford P. Baker
Keyword(s):  
Transition Temperature ◽  
Brittle To Ductile Transition ◽  
Aluminosilicate Glasses ◽  
Calcium Aluminosilicate ◽  
Double Torsion

Deformation mechanisms in MoSi2at temperatures above the brittle-to-ductile transition temperature

1997 ◽  
Vol 75 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Daniel J. Evans ◽  
Frank J. Scheltens ◽  
John B. Woodhouse ◽  
Hamish L. Fraser
Keyword(s):  
Transition Temperature ◽  
Deformation Mechanisms ◽  
Brittle To Ductile Transition

Pump-power-controlled luminescence switching in Yb3+∕Tm3+ codoped water-free low silica calcium aluminosilicate glasses

2007 ◽  
Vol 91 (7) ◽  
pp. 071102 ◽  
Author(s):  
C. Jacinto ◽  
M. V. D. Vermelho ◽  
E. A. Gouveia ◽  
M. T. de Araujo ◽  
P. T. Udo ◽  
...  
Keyword(s):  
Pump Power ◽  
Aluminosilicate Glasses ◽  
Calcium Aluminosilicate

Predicting the Brittle-to-Ductile Transition Temperatures for Surface Cracks in Pipeline Girth Welds: It’s Better Than You Thought

2008 ◽  
Author(s):  
Gery Wilkowski ◽  
David Rudland ◽  
Do-Jun Shim ◽  
David Horsley
Keyword(s):  
Transition Temperature ◽  
Surface Crack ◽  
Master Curve ◽  
Crack Depth ◽  
Temperature Shift ◽  
Transition Temperatures ◽  
Surface Cracks ◽  
Line Pipe ◽  
Brittle To Ductile Transition ◽  
Girth Welds

A methodology to predict the brittle-to-ductile transition temperature for sharp or blunt surface-breaking defects in base metals was developed and presented at IPC 2006. The method involved applying a series of transition temperature shifts due to loading rate, thickness, and constraint differences between bending versus tension loading, as well as a function of surface-crack depth. The result was a master curve of transition temperatures that could predict dynamic or static transition temperatures of through-wall cracks or surface cracks in pipes. The surface-crack brittle-to-ductile transition temperature could be predicted from either Charpy or CTOD bend-bar specimen transition temperature information. The surface crack in the pipe has much lower crack-tip constraint, and therefore a much lower brittle-to-ductile transition temperature than either the Charpy or CTOD bend-bar specimen transition temperature. This paper extends the prior work by presenting past and recent data on cracks in line-pipe girth welds. The data developed for one X100 weld metal shows that the same base-metal master curve for transition temperatures works well for line-pipe girth welds. The experimental results show that the transition temperature shift for the surface-crack constraint condition in the weld was about 30C lower than the transition temperature from standard CTOD bend-bar tests, and that transition temperature difference was predicted well. Hence surface cracks in girth welds may exhibit higher fracture resistance in full-scale behavior than might be predicted from CTOD bend-bar specimen testing. These limited tests show that with additional validation efforts the FITT Master Curve is appropriate for implementation to codes and standards for girth-weld defect stress-based criteria. For strain-based criteria or leak-before-break behavior, the pipeline would have to operate at some additional temperature above the FITT of the surface crack to ensure sufficient ductile fracture behavior.

Thermo-optical properties of iron-doped low silica calcium aluminosilicate glasses determined by photothermal methods

2005 ◽  
Vol 125 ◽  
pp. 197-199
Author(s):  
R. K. Miura ◽  
P. T. Udo ◽  
J. H. Rohling ◽  
E. A. Falcão ◽  
A. N. Medina ◽  
...  
Keyword(s):  
Optical Properties ◽  
Aluminosilicate Glasses ◽  
Iron Doped ◽  
Calcium Aluminosilicate ◽  
Photothermal Methods
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