3D STRESS LOCAL NONDESTRUCTIVE ANALYSIS IN THE MIDDLE PLANE OF A PLATE

【摘要】 <正> The Isodyne technique based on the scattered light scanning from athin laser beam can be used to obtain the information inside the loaded object in theroom temperature nondestructively,so it is a very powerful technique in 3D stressanalysis.The problems are how to interpret the information and how to get sufficientinformation from the few interference fringe.Birefringence phase shift techniquecan distinguish the fringe orders automatically and enrich the information in 256gray levels between maxim and minim light intensity.In the paper the Isodynebirefringence phase shift method with an oblique incidence and equilibrium equationis presented,by which the 3D stresses in the middle plane of a plate with U shapenotch are separated successfully.更多还原

【Abstract】 The Isodyne technique based on the scattered light scanning from a thin laser beam can be used to obtain the information inside the loaded object in the room temperature nondestructively,so it is a very powerful technique in 3D stress analysis.The problems are how to interpret the information and how to get sufficient information from the few interference fringe.Birefringence phase shift technique can distinguish the fringe orders automatically and enrich the information in 256 gray levels between maxim and minim light intensity.In the paper the Isodyne birefringence phase shift method with an oblique incidence and equilibrium equation is presented,by which the 3D stresses in the middle plane of a plate with U shape notch are separated successfully.更多还原