| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
An Alternate Approach to DCB Specimens for Determining Sulfide Stress Cracking Thresholds: Constant or Increasing Driving Force Specimens |
| Author(s) |
Carl F. Popelar, W. Fassett Hickey, James C. Sobotka, Julian F. Hallai, Yifei Zeng |
| On-Site Speaker (Planned) |
Carl F. Popelar |
| Abstract Scope |
Sulfide stress cracking (SSC) is one of the leading causes of premature failure of pipelines and equipment in sour service environments. The threshold stress intensity factor (KISSC) is a critical parameter to the design and development of materials and operating conditions to avoid premature failure. The current standard for determining KISSC involves measuring the arrest toughness of wedge-loaded double cantilever beam specimens exposed to sour environments. However, the known dependence of arrest toughness on the initial loading conditions and challenges in ensuring crack arrest raise uncertainties in KISSC. In this work, we propose an alternative approach for determining KISSC that relies on a novel wedge-loaded fracture specimen with a constant or increasing driving force. This specimen allows KISSC to be more directly determined from crack initiation, thereby eliminating ambiguities in determining KISSC. This paper will review the challenges of the current standard and discuss the benefits of this alternate method. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Mechanical Properties, Other |