## An Investigation of Couple-stresses in Orthotropic Beams |

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### Contents

STRAIGHT BEAM SUBJECTED TO PURE MOMENT | 11 |

THE EXPERIMENT | 19 |

CONCLUSION | 25 |

5 other sections not shown

### Common terms and phrases

antisymmetric apparent modulus apparent outer fiber average span-width ratio Based on ovendry beam under pure bending modulus compatibility equations compatibility of curvatures constants of integration couple-stress effect couple-stress theory cross shears curvilinear coordinate data and test deflection depth of beam Depth Width Apparent Desig differential equation displacements lU elastic constants elastic limit equations 29 equations 30 equations of compatibility Figure 13 figure 17 Forest Products Laboratory inches Load Deflec material constant modulus of elasticity necessarily equal orthotropic material outer fiber strain outer fiber stress plane strain Poisson's ratios polar coordinate system polar coordinates proper derivatives r2 ae real outer fiber SERIES I Cont shear modulus shear stress shown in figure small specimens small terms gives solution Span strain gages strain gradients stress functions stresses and couple-stresses subjected to pure substitution into equation Table 1.--Beam data test results three equations tion varying stress field vzxvxz