Full- and small-scale tests on strain capacity of X80 seamless pipes
| Autor: | Nobuyuki Hisamune, Ajit Bastola, Ali Mirzaee-Sisan, Junkan Wang, Masahiko Hamada, Hidenori Shitamoto |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Heat-affected zone
Engineering X80 Bending (metalworking) business.industry Internal pressure Fracture mechanics 02 engineering and technology Welding Structural engineering 021001 nanoscience & nanotechnology Girth (geometry) girth weld law.invention 020303 mechanical engineering & transports Fracture toughness fracture mechanics 0203 mechanical engineering line pipes law Fracture (geology) 0210 nano-technology business full-scale test Earth-Surface Processes |
| Zdroj: | Procedia Structural Integrity. 2:1894-1903 |
| ISSN: | 2452-3216 |
| DOI: | 10.1016/j.prostr.2016.06.238 |
| Popis: | Application of high-strength steels such as X80 grade may help reduce cost in offshore pipeline projects through wall thickness optimisation and associated installation costs. To ensure reliability of such application during the pipeline installation and operation stages, further understanding on the strain capacity of girth welds of X80 grade pipes is required. This paper presents details of a research project containing small-scale and full-scale experiments on X80 line pipe specimen containing girth welds. Initial defects are introduced on the Heat Affected Zone (HAZ) and Weld Metal (WM) of the girth welds prior to the test in order to understand their fracture behaviour. The full-scale experimental program includes four-point bending tests with and without internal pressure applied, and reeling tests. Tensile properties of base metal, WM and HAZ are measured. Fracture toughness tests of WM and HAZ are also carried out. No through-thickness crack growth has been observed in the reeling tests and bending tests without internal pressure. However, some bending tests with internal pressure have seen crack growing through the thickness of the girth weld. Results from this study have shed light on the extent of crack growth in the girth welds of X80 pipes as influenced by their initial size, location, and internal pressurization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|