Residual Stress Measurements in Fracture Specimens used for Stress Relaxation Tests
Residual stresses induced by non-stress relieved welds in steel pipework within power plants drive creep strain accumulation at high temperatures. To assess cracking due to strain relaxation of secondary loads, residual stresses need to be induced in fracture specimens. Residual stresses have been induced in compact tension, C(T), type specimens using the insertion of an oversized wedge and electron beam welding. The specimens are made from uniformly pre-compressed austenitic stainless steel. Work hardening the material increases its yield strength and thus allows larger magnitudes of residual stresses to be generated within the components. Following the neutron diffraction measurements, these components shall be placed in a furnace to perform Creep Crack Growth (CCG) tests.
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KAPADIA Priyesh; DAVIES Catrin; NIKBIN Kamran and PIRLING Thilo. (2013). Residual Stress Measurements in Fracture Specimens used for Stress Relaxation Tests. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-135
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