Abstract
In fracture mechanics, a flaw behavior in pressure vessels is assessed with respect to the material fracture toughness.
Fracture toughness which most Fitness-for-Service (FFS) codes relies on, only considers mode-I crack opening. However, in presence of tilted flaws, like quasi-laminar hydrogen flakes, this mode-I toughness may be too severe, and a mixed mode I+II fracture toughness seems to be more appropriate.
In order to address the assessment of the fracture toughness curve, mixed mode I+II tests were performed by the authors on ferritic steel samples by adjusting the standard mode I CT specimen geometry to a geometry subjected to mixed mode I+II. Then, XFEM simulations of the mixed mode tests were performed in order to calculate the J-integral along the crack front.
Based on tests and calculations results, the paper explains how the authors work towards proposing a method to measure the material fracture toughness in case of flaws subjected to mixed mode (I+II) loading.
Fracture toughness which most Fitness-for-Service (FFS) codes relies on, only considers mode-I crack opening. However, in presence of tilted flaws, like quasi-laminar hydrogen flakes, this mode-I toughness may be too severe, and a mixed mode I+II fracture toughness seems to be more appropriate.
In order to address the assessment of the fracture toughness curve, mixed mode I+II tests were performed by the authors on ferritic steel samples by adjusting the standard mode I CT specimen geometry to a geometry subjected to mixed mode I+II. Then, XFEM simulations of the mixed mode tests were performed in order to calculate the J-integral along the crack front.
Based on tests and calculations results, the paper explains how the authors work towards proposing a method to measure the material fracture toughness in case of flaws subjected to mixed mode (I+II) loading.
| Original language | English |
|---|---|
| Title of host publication | ASME 2018 Pressure Vessels and Piping Conference |
| Subtitle of host publication | Volume 1A: Codes and Standards |
| Pages | 1-10 |
| Number of pages | 10 |
| Volume | 2018 |
| DOIs | |
| State | Published - Oct 2018 |
| Event | 2018 - ASME Pressure Vessels & Piping Conference - Hilton, Prague Duration: 15 Jul 2018 → 20 Jul 2018 https://www.asme.org/events/pvp |
Conference
| Conference | 2018 - ASME Pressure Vessels & Piping Conference |
|---|---|
| Country/Territory | Czech Republic |
| City | Prague |
| Period | 2018-07-15 → 2018-07-20 |
| Internet address |