About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading
TypeArticles dans des revues avec comité de lecture
Because of the reverse cyclic plastic zone at the crack tip, there is plastic dissipation in heat at the crack tip under cyclic loading. That creates a heterogeneous temperature field around the crack tip. A thermo-mechanical model is proposed in this paper for evaluating the consequence of this temperature field on the Mode I stress intensity factor. Two cases are studied: (i) the theoretical problem of an infinite plate with a semi-infinite through crack under Mode I cyclic loading, and (ii) a finite specimen with a central through crack. In the first case, the main hypothesis and results are presented from the literature but no heat loss is taken into account. In second case, heat loss by convection is taken into account with a finite element analysis, while an analytical solution exists in the literature for the first case. In both cases, it is assumed that the heat source is located in the reverse cyclic plastic zone. The heat source within the reverse cyclic plastic zone is quantified by experiments on a mild steel under R=0.1. It is shown that the crack tip is under compression due to thermal stresses coming from the heterogeneous temperature field around the crack tip. The effect of this stress field on the stress intensity factor (its maximum, minimum and its range) is calculated. This paper shows that experiments have to be carried out to determine the heat source within the reverse cyclic plastic zone. This is the key parameter to quantify the effect of dissipation at the crack tip on the stress intensity factor.
Showing items related by title, author, creator and subject.
Thermal effect of plastic dissipation at the crack tip on the stress intensity factor under cyclic loading RANC, Nicolas; PALIN-LUC, Thierry; PARIS, Paul C. (Elsevier, 2011)Plastic dissipation at the crack tip under cyclic loading is responsible for the creation of an heterogeneous temperature field around the crack tip. A thermomechanical model is proposed in this paper for the theoretical ...
PARIS, Paul C.; PALIN-LUC, Thierry (Elsevier, 2009)Crack stability is discussed as affected by their presence in statically-indeterminate beams, frames, rings, etc. loaded into the plastic range. The stability of a crack in a section, which has become plastic, is analyzed ...
Fatigue crack initiation and growth on a steel in the very high cycle regime with sea water corrosion PALIN-LUC, Thierry; PÉREZ-MORA, Ruben; BATHIAS, Claude; DOMINGUEZ, Gonzalo; PARIS, Paul C.; ARANA, Jose Luis (Elsevier, 2010)This paper is devoted to the effect of corrosion on the gigacycle fatigue strength of a martensitic–bainitic hot rolled steel used for manufacturing offshore mooring chains for petroleum platforms. Smooth specimens were ...
Very high cycle fatigue of a high strength steel under sea water corrosion: A strong corrosion and mechanical damage coupling PEREZ-MORA, Ruben; PALIN-LUC, Thierry; BATHIAS, Claude; PARIS, Paul C. (Elsevier, 2015)This paper is focused on the effect of sea water corrosion on the gigacycle fatigue strength of a martensitic–bainitic hot rolled steel R5 used for manufacturing off-shore mooring chains for petroleum platforms in the North ...
Overload effects on a ferritic-baintic steel and a cast aluminium alloy: two very different behaviours SAINTIER, Nicolas; PALIN-LUC, Thierry; EL DSOKI, Chalid; BIDOUARD, Hadrien; KAUFMANN, Heinz; DUMAS, C.; VÖLLMECKE, F.J.; SONSINO, Cetin Morris (Wiley, 2011)Load controlled fatigue tests were performed up to 107 cycles on flat notched specimens (Kt =2.5) under constant amplitude and variable amplitude loadings with and without periodical overloads. Two materials are studied: ...