Application of the Higher-Order Hamilton Approach to the Nonlinear Free Vibrations Analysis of Porous FG Nano-Beams in a Hygrothermal Environment Based on a Local/Nonlocal Stress Gradient Model of Elasticity [PDF]
Nanomaterials, 2022 Nonlinear transverse free vibrations of porous functionally-graded (FG) Bernoulli–Euler nanobeams in hygrothermal environments through the local/nonlocal stress gradient theory of elasticity were studied.
Rosa Penna +3 more
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Facilitation and competition deconstructed: a mechanistic modelling approach to the stress gradient hypothesis applied to drylands [PDF]
Scientific ReportsFacilitative interactions among species are key in plant communities. While experimental tests support the Stress Gradient Hypothesis (SGH) as an association between facilitation and stress, whether the shape of net effects along stress gradients can be ...
Rubén Díaz-Sierra +3 more
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Evaluation of extremely steep residual stress gradients based on a combined approach using laboratory-scale equipment [PDF]
Journal of Applied Crystallography, 2021 Surface treatments characterized by rapid heating and cooling (e.g. laser hardening) can induce very steep residual stress gradients in the direct vicinity of the area being treated. These gradients cannot be characterized with sufficient accuracy by means of the classical sin2Ψ approach applying angle-dispersive X-ray diffraction.
Andreas Fischer +3 more
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Numerical approach for a continuum theory with higher stress gradients [PDF]
PAMM, 2021 AbstractWe use an extended balance of linear momentum derived from stress field analysis of higher order terms in power series expansion. Thus, the balance equation accounts for higher gradients of stress in the contiguity of continuum points. Interestingly, it does not coincide with the balance of linear momentum from strain gradient elasticity.
Seyed Ali Ghasemi +3 more
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Oxidative stress in birds along a NOx and urbanisation gradient: An interspecific approach
Science of The Total Environment, 2017 Urbanisation is regarded as one of the most threatening global issues for wildlife, however, measuring its impact is not always straight forward. Oxidative stress physiology has been suggested to be a useful biomarker of health and therefore, a potentially important indicator of the impact that urban environmental stressors, especially air pollution ...
Pablo Salmón +4 more
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Stress Gradient Effects on Notched Composite Failure Using a Local-Global Approach [PDF]
45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference, 2004 Micromechanics based analysis to predict damage initiation in compressively loaded symmetric notched multidirectional laminates under remote uniaxial loading is described. A novel hybrid local-global finite element method in conjunction with the commercial code ABAQUS is used to solve the governing system of equations.
Junghyun Ahn, Anthony M. Waas
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Generalized Terzaghi’s Effective Stress Equation for Unsaturated Soil: An Independent Phase Balance Approach That Considers a Pore Water Content Gradient [PDF]
Geofluids, 2022 The effective stress equation for unsaturated soil is the most important equation in unsaturated soil mechanics. It has been derived by many scholars using different methods. However, none of them considered the gradient of the pore water content, which results in unreasonable force balance equations for different constituent phases in unsaturated soil.
Lifeng Zeng, Longtan Shao
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Petroleum, 2017 A study performed by Marbun et al. [1] claimed that “A new methodology to predict fracture pressure from former calculations, Matthew–Kelly and Eaton are proposed.” Also, Marbun et al.'s paper stated that “A new value of Poisson's and a stress ratio of the formation were generated and the accuracy of fracture gradient was improved.” We found those all ...
Farizal Hakiki, Muizzuddin Shidqi
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A variational approach for the deformation of a saturated porous solid. A second-gradient theory extending Terzaghi's effective stress principle [PDF]
Archive of Applied Mechanics (Ingenieur Archiv), 2010 15 ...
F. dell'isola, M. Guarascio, K. Hutter
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From uni- to multi-axial fretting-fatigue crack nucleation: Development of a stress-gradient-dependent critical distance approach [PDF]
International Journal of Fatigue, 2013 Fretting fatigue is characterized by combined high stress gradients induced by contact loading and more homogeneous stress gradients induced by bulk fatigue stressing. The stress gradients computed at the "hot-spot" located on the surface at the trailing contact border are very high, usually above 10 GPa/mm.
S. Fouvry, H. Gallien, B. Berthel
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