Study of stable and unstable crack extensions in type 316 stainless steel fracture mechanics specimens
In the frame of a programme covering stress-strain behaviour at various deformation rates of smooth and flawed specimens in AISI 316 type stainless steel, three FM tests with wide plates are tackled. The test rigs consist of a 3 MN rigid loading machine and a 5MN "soft" loading system (LDFT) having a compliance of 1.47 x 1.0 E-4 mm/N. The specimen configuration is the single-edge cracked plate in tension. The relative crack size is 0.5 (2 tests) or 0.3. The estimate of the material crack-growth-resistance curve J-a is obtained from analysis of a monotonic displacement controlled test performed with the 3 MN machine on one 0.5 plate. A stability assessment study is carried out testing the 0.3 plate in the LDTF. This analysis used the EPRI Engineering Approach. The calculated crack extension predictions at unstability are conservative, i.e. 35 percent short of the one ascertained by surface inspection. The second 0.5 plate is pulled to rupture in the LDTF. This experiment aims specifically at the monitoring of crack growth velocity, using a high speed camera.
Bibliographic Reference: Paper presented: 10th International Conference on Structural Mechanics in Reactor Technology, Anaheim, Ca. (US), Aug. 14-18, 1989
Availability: Available from (1) as Paper EN 34807 ORA
Record Number: 198910621 / Last updated on: 1994-12-01
Original language: en
Available languages: en