Experimental Evaluation of the Size Effect on the Ductile and Brittle Fracture Toughness of a Steel Pressure Vessel |
| Journal |
Materials Science Forum (Volume 614) |
| Volume |
Advanced Materials Science and Technology |
| Edited by |
Jian Lu |
| Pages |
41-46 |
| DOI |
10.4028/www.scientific.net/MSF.614.41 |
| Online since |
March, 2009 |
| Authors |
Zhao Xi Wang,
Hui Ji Shi,
Jian Lu
|
| Keywords |
Fracture Affect Volume, Fracture Toughness, Size Effect, Stress Triaxiality |
| Abstract |
Experiments of fracture toughness with non-standard SENB specimens of five different thicknesses were performed to investigate the size effect on the ductile and brittle fracture for different temperatures. From the experimental results it is found that size effects both brittle and ductile fracture with the same trend but for different mechanical reasons. The ductile fracture toughness increases firstly with increased plastic deformation zone size and plastic fracture strain under general yielding conditions, and then drops down due to the plastic deformation zone size not changing much which is less than the residual ligament width and the increase of the proportion of the high stress triaxiality zone to the whole specimen. The fracture toughness of the lower shelf increases with increasing thickness of the plastic deformation zone size under small scale yielding conditions, and then drops down due to the increase of the high out-of-plane constraint. |
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