COMPLETE DETERMINATION OF THE PLANAR STRESS CONDITION BY THE AXIAL PATTERN METHOD.
REDSTONE SCIENTIFIC INFORMATION CENTER REDSTONE ARSENAL ALA
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The optical-stress procedure derived here allows 1 A quantitative assessment of the planar stress condition at a point in the model. This can be done at first glance, whereupon the points and areas of particular interest are selected with little effort e.g., the sections under tensile stress in a reinforced concrete structure. 2 An accurate point-by-point measurement of the planar stress condition according to magnitude and direction of the principal normal stresses and the maximum shearing stress. The method is based solely on the gaging of isochromatic fringe patterns, which are obtained by means of simple equipment. The strong point of the new method of analysis is that it is especially applicable to those places in the model which exhibit few isochromatic fringes, i.e., a low shearing stress gradient. It thus provides an excellent complement to the graphic evaluation methods which become inaccurate here. Author