Topic
Stress field
About: Stress field is a research topic. Over the lifetime, 11926 publications have been published within this topic receiving 226417 citations.
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TL;DR: In this article, the authors describe a critical distance theory which uses local stress field information to predict the effect of stress concentrations on fracture strength in ceramics containing notches, long cracks and short cracks.
154 citations
TL;DR: In this article, Gerber, Dietman, Goodman, Soderberg, and Sermanet extended the critical plane approach to multiaxial fatigue conditions, and the reliability and accuracy of the multiaxonial fatigue criteria were checked in the presence of high values of the ratio between the maximum normal stresses and the shear stress amplitudes relative to the critical planes, which has an intrinsic threshold value over which its use is not justified.
154 citations
TL;DR: In this article, finite element techniques have been applied to predict the residual stress fields induced in two different stainless steels, combining shock wave hydrodynamics and strain rate dependent mechanical behaviour.
Abstract: Laser shock processing, also known as laser shock peening, generates through a laser-induced plasma, plastic deformation and compressive residual stresses in materials for improved fatigue or stress corrosion cracking resistances. The calculation of mechanical effects is rather complex, due to the severity of the pressure loading imparted in a very short time period (in the ns regime). This produces very high strain rates (106 s−1), which necessitate a precise determination of dynamic properties.Finite element techniques have been applied to predict the residual stress fields induced in two different stainless steels, combining shock wave hydrodynamics and strain rate dependent mechanical behaviour. The predicted residual stress fields for single or multiple laser processes were correlated with those from experimental data, with a specific focus on the influence of process parameters such as pressure pulse amplitude and duration, laser spot size or sacrificial overlay.Among other results, simulations confirmed that the affected depths increased with pulse duration, peak pressure and cyclic deformations, thus reaching much deeper layers (> 0.5 mm) than with any other conventional surface processing. To improve simulations, the use of experimental VISAR determinations to determine pressure loadings and elastic limits under shock conditions (revealing different strain-rate dependences for the two stainless steels considered) was shown to be a key point.Finally, the influence of protective coatings and, more precisely, the simulation of a thermo-mechanical uncoated laser shock processing were addressed and successfully compared with experiments, exhibiting a large tensile surface stress peak affecting a few tenths of micrometres and a compressive sub-surface stress field.
153 citations
TL;DR: In this paper, a new macro-mechanical model for fatigue life prediction, taking into account an elastic-plastic stress distribution and the stress gradient evolution, is introduced.
153 citations
TL;DR: In this paper, the brittle fracture behaviour of PMMA under mixed mode I/II loading has been investigated using pre-cracked bend bar specimens loaded in antisymmetric and symmetric four point loading.
153 citations