Strain – Concentration Factor of Notched Bars under Combined Loading

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This paper investigates the effect of notch depth and Poisson’s ratio on the elastic new Strain-Concentration Factor (SNCF) of rectangular bars with a single edge U-notch under combined loading. The new SNCF under combined loading of static tension and pure bending have been defined under triaxial stress state. The Finite Element Method (FEM) simulation and super-position technique are used to provide favorable results. The employed specimens have constant gross thickness of 16.7 (mm). The net section thickness varied to give net-to-gross thickness ratio ho/Ho from 0.2 to 0.95. The results indicated that the elastic new SNCF for combined loading increases as the notch depth increases up to ho/Ho = 0.7 and  then the new SNCF sharply decreased for shallow notches in the range of 0.8 ≤ ho/Ho ≤ 0.95. Also, the elastic new SNCF of combined loading is greater than that of pure bending and less than that of the static tension for 0.2 ≤ ho/Ho ≤ 0.7and vice versa for shallow notches. Significantly, it is shown that the new SNCF influenced by the Poisson’s ratio, especially in the range 0.2 ≤ ho/Ho ≤ 0.85. On the other hand, the SNCF is nearly independent of the Poisson’s ratio for shallow notches (i.e. ho/Ho ≥ 0.90).
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Bending; Combined; Notched Bar; Strain Concentration; Tension

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