Fatigue life estimation in welded joints under multiaxial loadings

Welded joints are frequently locations for cracks initiation and propagation that may cause fatigue failure of engineering structures. Biaxial or triaxial stress-strain states are present in the vicinity of welded joints, due to local geometrical constraints, welding processes and/or multiaxial external loadings. Fatigue life evaluation of welded joints under multiaxial proportional (in-phase) cyclic loading can be performed by using conventional hypotheses (e.g. see the von Mises criterion or the Tresca criterion) on the basis of local approaches. On the contrary, the fatigue life predictions of welded joints under non-proportional (out-of-phase) cyclic loading are generally unsafe if these conventional hypotheses are used. A criterion initially proposed by the authors for smooth and notched structural components has been extended to the fatigue assessment of welded joints. In more detail, fatigue life of welded joints under multiaxial stress states can be evaluated by considering a nonlinear combination of the shear stress amplitude (acting on the critical plane) and the amplitude and the mean value of the normal stress (acting on the critical plane). In the present paper, fatigue lifetimes predicted through the proposed criterion are compared with experimental fatigue life data available in the literature, related to fatigue biaxial tests

Modelling of the fatigue strength degradation due to a semi-elliptical flaw

Abstract Due to the fulfilment of modern operational requirements and time-consuming of complex fatigue responses computation, the surface micro-flaw analysis in large moving systems is still one of the challenging tasks. Thus, the present research work discusses the fatigue computational design strategy that can be used to properly evaluate the driving mode caused by a surface semi-elliptical flaw. Further, through the novel analytical solutions, experimentally assessed, the residual life and crack path are designed taking into account the crack shape effect

On a kinked crack model to describe the influence of material microstructure on fatigue crack growth

Threshold condition and rate of fatigue crack growth in both short and long crack regime appear tobe significantly affected by the degree of crack deflection. In the present paper, a theoretical model of aperiodically-kinked crack is presented to describe the influence of the degree of crack deflection on the fatiguebehavior. The kinking of the crack is due to a periodic self-balanced microstress field having a length scale, d.By correlating the parameter d with a characteristic material length (e.g. average grain size in metals, maximumaggregate dimension in concrete), the possibility of using the present model to describe some experimentalfindings related to crack size effects in fatigue of materials is explored. Well-known experimental resultsconcerning two different situations (fatigue threshold and fatigue crack growth in the Paris regime) are brieflyanalysed

Interpreting experimental fracture toughness results of quasi-brittle natural materials through multi-parameter approaches

Natural stones like marbles are often employed as facade panels to externally cover buildings. These natural materials tend to exhibit a quasi-brittle nonlinear fracture behaviour which, conversely to concrete counterpart, has much less been studied in the literature. In the present paper, an experimental campaign on the so-called red Verona marble is carried out, and the results are discussed together with some previously published results on the white Carrara marble. The analysis of the two marbles as a whole allows us to discuss size effect and to point out the need for additional parameters in order to describe their fracture behaviour. The study focuses on a two-parameter model which accounts for a characteristic material length. A quantitative correlation between material microstructure features, obtained from thin sections technique, and the characteristic material length is proposed

Mode II fracture toughness for non-planar frictional cracks

Abstract Traction-free and planar cracks represent a rather idealized picture of the physical reality, commonly used in fracture mechanics problems. In the present paper, the influence of roughness and friction of crack surfaces is examined in relation to both the resulting near-tip stress field and the fracture resistance under monotonic mixed-mode loading. A two-dimensional model is presented where an elastic-plastic-like constitutive interface law is adopted to describe the Mode I/II coupling between displacements and tractions along the crack surfaces. The solution is obtained using the Distributed Dislocation Technique (DDT). By considering a linear piecewise periodic profile of the crack, the present model is employed to quantify the mode II fracture toughness of different types of natural stones under varying mode I compressive load

Crack path dependence on inhomogeneities of material microstructure

Crack trajectories under different loading conditions and material microstructural features play animportant role when the conditions of crack initiation and crack growth under fatigue loading have to beevaluated. Unavoidable inhomogeneities in the material microstructure tend to affect the crack propagationpattern, especially in the short crack regime. Several crack extension criteria have been proposed in the pastdecades to describe crack paths under mixed mode loading conditions. In the present paper, both the Sihcriterion (maximum principal stress criterion) and the R-criterion (minimum extension of the core plastic zone)are adopted in order to predict the crack path at the microscopic scale level by taking into account microstressfluctuations due to material inhomogeneities. Even in the simple case of an elastic behaviour under uniaxialremote stress, microstress field is multiaxial and highly non-uniform. It is herein shown a strong dependence ofthe crack path on the material microstructure in the short crack regime, while the microstructure of the materialdoes not influence the crack trajectory for relatively long cracks

Discontinuous FE approach and lattice models to describe cracking behaviour in fibre-reinforced brittle materials

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Defect tolerance in soft materials

Abstract The ability of materials to withstand defects like cracks, notches or generic geometric discontinuities, is usually indicated as flaw tolerance, and is a crucial aspect of the safety assessment of structural components. Flaw tolerance in soft materials can be substantially different from that in traditional ones. As a matter of fact, the capacity of highly deformable materials to undergo large deformations with a significant rearrangement of the molecular network at the miscroscale in highly stressed regions can enhance such an ability, leading to an erroneous underestimation of their safety level against defect-driven failure, if traditional methods of analysis are employed. In the present research work, the mechanics of highly deformable notched plates is considered from the fail-safety point-of-view. Experimental, numerical and theoretical remarks are made in order to explain the mechanism of defect resistance in such a class of materials from a physically-based point-of-view

Fractals and the lead crack airframe lifing framework

Abstract The physically short crack regime is primary region of interest in the design and sustainment of highly optimised metallic aircraft. The authors have previously shown that by characterising a fracture surface using fractals concept produces a crack growth model similar to that first proposed by Frost and Dugdale in 1958. This provides a scientific basis to the crack growth model. Further investigations revealed that for short cracks these models predict that crack growth is exponentially related to the applied load history. This observation has led to a practical aircraft lifing approach applicable to the short crack regime known as the lead crack framework. This paper summarises the fractality of metallic fracture surfaces, presents examples of the crack growth behaviour in complex structures, and summarises some useful crack growth tools

fatigue life analysis of edge notches with damage

Abstract In the present paper, the fracture mechanics-based computational model is proposed for estimating the strength of double-edge notched configuration under cyclic loading. The propagation of a quarter-elliptical corner crack located at one of two semi-circular edge-notches is analytically investigated by means of the fatigue life to failure and crack path. Also, through experimental observations available in the literature the reliability of obtained theoretical results is discussed