We conduct materials testing of various metallic materials such as steel, aluminium, and copper alloys. Testing of welding procedures is and has been an important activity area since the engineering industry started making deliveries to the Norwegian continental shelf.
Fracture mechanics testing
Fracture mechanics testing can provide more detailed information about fracture toughness than ordinary mechanical testing. SINTEF Norlab has extensive experience measuring Crack Tip Opening Displacement (CTOD) in welded steel joints. We can provide a complete test procedure from sampling to report, including analysed test results.
Fractures in materials are something you always strive to avoid, but what happens if a fracture is detected in the material?
Fracture mechanics testing allows us to investigate the material’s inherent resistance to fracture formation. This resistance is measured through the material’s stress intensity factor, K. Fracture mechanics testing allows us to gauge how large a fracture needs to be before there is a risk of collapse, known as critical crack length.
At SINTEF Norlab, we have extensive experience with the testing of SENB specimens. We also work actively to develop procedures for other specimen types, including Compact Tension (CT specimen) and Single Edge Notch Tension (SENT specimen).
Our tests are conducted in accordance with, amongst others, the following standards:
- BS 7448
- NS-EN 10225
- ASTM E1820
- EEMUA pub. 158
Evaluation and reporting
We have a dedicated team in the metallographic department that evaluate the fracture surface and how the fracture has formed in the microstructure. Spark eroding is used to ensure an optimal finish and cut placement, which is highly beneficial when testing HAZ and fusion line in welded specimens. We draw up complete reports in accordance with the assignment specifications.