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The tangent modulus theory of inelastic buckling replaces Young's modulus with

  • A.The yield stress divided by the strain
  • B.The secant modulus in every case
  • C.The local stress-strain curve slope
  • D.The shear modulus

Answer: C

Above the proportional limit the material's effective stiffness falls, and the tangent modulus captures that. It gives a lower critical load than the elastic formula and agrees well with test results for real aluminium struts.

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