Effect of Stress Triaxiality on The Strain Concentration Factor
Hitham Tlilan1, Mohammad Gharaibeh2, Manal Mustafa3, Ali Jawarneh4
1Hitham Tlilan*, Mechanical Engineering Department, Hashemite University (HU), 13115, Zarqa, Jordan.
2Mohammad Gharaibeh, Mechanical Engineering Department, Hashemite University (HU),13115,Zarqa,Jordan.
3Manal Mustafa, Mechanical Engineering Department, Hashemite University (HU), 13115, Zarqa, Jordan.
4Ali Jawarneh, Mechanical Engineering Department, Hashemite University (HU), 13115, Zarqa, Jordan.
Manuscript received on November 20, 2019. | Revised Manuscript received on November 26, 2019. | Manuscript published on 30 November, 2019. | PP: 3468-3474 | Volume-8 Issue-4, November 2019. | Retrieval Number: C3922098319/2019©BEIESP | DOI: 10.35940/ijrte.C3922.118419
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Axisymmetric machine element with irregularities such as notches encountered with effects of stress triaxiality on the strain concentration factor (SNCF) at the reduced section. The effect of notch geometries on the triaxial stress state development in the critical section of a notched cylindrical bar is studied here using FEM. In addition, the effect of triaxial stress state (TSS) on the SNCF is evaluated. To this end, a notched cylindrical bars with notch depths from extremely deep notch (do/Do = 0.2) shallow notch (do/Do = 0.95) has been employed. The results show that the notches introduce a TSS at the critical section, which strongly affected by the notch depth as well as the notch radii. In this paper, a new concentration factor is introduced as the ratio of the stress triaxiality factor at the notch root (TFNR) to the average triaxiality on the critical section (), i.e. the triaxiality concentration factor KTF. The numerical results reveal that the variation of the average triaxiality factor with total strain shows the same trend as that of the SNCF. The variation of the elastic values of TFCN, , , and SNCF with do/Do and show that the minimum TFNR leads to the maximum elastic SNCF. It is prominent that elastic TFNR is less that elastic TFCN for 0.2 ≤ do/Do ≤ 0.85, while it is greater for shallow notches. The current results indicate a strong compatibility between the newly defined triaxiality concentration factor and the SNCF up to general yielding.
Keywords: Finite Element Method, Notch, Strain Concentration, Stress Triaxiality.
Scope of the Article: Probabilistic Models and Methods.