What is meant by shear strength

Shear strength of round steel

  • yeti
  • 18387 views5 answers
  • How is the rod loaded?

    You always write about shear strength.

    Is the rod subjected to tension or shear stress?


    The minimum tensile strength for a steel (S235JR - formerly St37-2), which is used in structural steelwork, is 370 N / mm², depending on the quality. Its minimum yield strength, however, is 235 N / mm². If you were to load a sample of this steel, which has a cross-section of 1 mm², with a force in a tensile test, this would have to be at least 370 N in order to tear the sample. 370 N correspond to the weight of a mass of 37.7 kg on earth. From this it can be concluded that when attempting to lift a mass of 37.7 kg or greater with this steel wire, failure of the material can no longer be ruled out. With this load, the wire is permanently (plastically) deformed. Since this should usually not be allowed, the minimum yield strength (Re) is often used in the mechanical design of components. This value indicates the stress in the material up to which only elastic deformation takes place. This means that with a tensile force Fz of 235 N on a sample with a cross-section of 1 mm², this sample stretches, but it returns to its original state without permanent (plastic) deformation. A mass of 23.9 kg can be determined here, with the weight of which this material can be loaded in the tensile test, but behaves elastically.

    So you get a tensile strength of approx. 7.5 t.

    That's a lot.

    If you want more, you have to use higher quality steel.