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- 저자 : Alaaeldin Elsisi (검색결과 1 건)
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Fatigue Crack Tip Plasticity for Inclined Cracks
Hesham El-Emam,Alaaeldin Elsisi,Hani Salim,Hossam Sallam 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
The evaluation of the crack tip deformation is essential to the estimation of crack growth under either static or cyclic loading. A 3-D elastic–plastic fi nite element analysis was developed to simulate the crack tip deformation along mixed mode inclined edge cracks in a steel plate subjected to either monotonic or cyclic loading at selected R-ratios. In this paper, two types of crack confi gurations were investigated: inclined cracks with equal inclined lengths (EICL) and inclined cracks with equal horizontal projection length (ECHP). The development of the monotonic (Δm) and cyclic (Δc) crack tip plastically zones and the monotonic (CTOD) and cyclic (ΔCTOD) crack tip opening displacements were traced to fi nd the eff ect of the crack inclination angle, which signifi cantly aff ected the size and shape of the crack tip plastic zone. The fi nite element results compared well with the analytical results based on modifi ed Dugdale’s model. It was observed that Mode II has a signifi cant eff ect on the plastic zone in the case of equal inclined crack length (EICL), i.e., Mode II increases as the crack angle decreases. Also, it is interesting to note that for the EICL case, the magnitude of Δc is delayed to appear with decreasing the inclination angle, for example, for θ = 90° the cyclic plastic zone appeared at Δσ = 103.32 MPa, while for θ = 45° the cyclic plastic zone appeared at Δσ = 132.84 MPa. Whereas, the variation of monotonic and cyclic plastic zone size in the equal crack horizontal projection (ECHP) case is not aff ected by the crack inclination angle. Furthermore, it was observed that the static crack tip opening displacement (CTOD) and the cyclic (ΔCTOD) are independent of the crack inclination angle in case of ECHP, due to such cracks take into consideration the eff ect of inclination angle through its length.
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