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摘要
This paper presents a simple approach to predict the failure of steel structures under the interaction effect of fracture and fatigue which is termed as ultra-low cycle fatigue (ULCF) failure. The approach mainly consists of simple fracture criterion, which is obtained from further simplification of available cyclic void growth model (CVGM). As for alternative component of ULCF analysis, a simple non-linear hardening model is proposed to employ in elasto-plastic analysis for situations where parameters of available mix hardening models (combined isotropic and kinematic hardening models) are difficult to determine. Initially the simplified ULCF fracture criterion is clearly presented and associated ULCF fracture prediction methodology is also indicated. Then the elasto-plastic hardening model is proposed and model behavior is compared with experimental behavior of few materials. The procedure to determine hardening constants and finite element (FE) formulation are also clearly mentioned. The simplified approach is then employed to determine ULCF fracture of some structural models. Hence verification of the simplified approach is confirmed by comparing the results with previous approaches-based estimations. Finally, study tends to conclude that the simplified approach produces reasonable accurate prediction to ULCF fracture of steel structures where magnitude of triaxiality remains relatively constant. Further, it was able to prove that commonly available elasto-plastic FEM packages can be reasonably employed to estimate ULCF fracture of steel structure when simplified ULCF fracture criterion governs the failure.
- 出版日期2013-2
