Abstract
Samples of martensitic stainless steel, (Sandvik HT-9) in the form of beams and plates, exhibited a buckling type of structural instability when placed in a uniform magnetic field. Post buckling stresses of up to 497 MPa (72000 psi) were observed for a cantilevered plate placed in a one tesla magnetic field normal to the plate surface. Buckling phenomena were observed for both cantilevered circular rods and flat plates of magnetic stainless steel. The buckling magnetic field was geometry dependent with values as low as 0.25 T for a plate with length to thickness ratio of 90. Above the buckling field the cantilevered structure exhibited two stable equilibrium positions with a tip displacement of as much as 8–10 times the plate thickness. These results suggest that further study be given to the structural design implications of using magnetic steels in magnetic fusion reactors.
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