Stress Stiffening
Mostrando 1-12 de 15 artigos, teses e dissertações.
-
1. Evaluation of the stiffening mechanism based on micro-sized particle inclusions in laminated composites
Rigid particles have been incorporated into laminated composites, especially to enhance their bending performance attributed to the stiffening of the matrix phase (i) and the increased interlaminar shear resistance (ii). In order to better evaluate the improvement mechanism provided by the particulate inclusions, this work investigates the incorporation of m
Mat. Res.. Publicado em: 17/10/2019
-
2. Stiffening Effect of Bolt-On Transducers on Strain Measurements
Abstract The strain of a structural element is often measured indirectly by determining the strain of a transducer that is supposed to follow the deformation of the element perfectly, and with negligible interaction, around the mounting point. However, this assumption is not always true, and depends on the stiffness of the transducer relative to the local st
Lat. Am. j. solids struct.. Publicado em: 2016-03
-
3. Lipoic acid, but not tempol, preserves vascular compliance and decreases medial calcification in a model of elastocalcinosis
Vascular calcification decreases compliance and increases morbidity. Mechanisms of this process are unclear. The role of oxidative stress and effects of antioxidants have been poorly explored. We investigated effects of the antioxidants lipoic acid (LA) and tempol in a model of atherosclerosis associated with elastocalcinosis. Male New Zealand white rabbits
Braz J Med Biol Res. Publicado em: 2014-02
-
4. The use of piezoelectric stress stiffening to enhance buckling of laminated plates
A technique for enhancement of buckling loads of composite plates is proposed. The technique relies on using stress stiffening to create a non-zero tensile force acting along the plate plane which ultimately permits the application of higher external compressive forces that lead to traditional buckling instabilities. The idea is to completely restrain the pl
Latin American Journal of Solids and Structures. Publicado em: 2010
-
5. Um modelo geometricamente exato de barras com grandes deformações, que considera a distorção e o empenamento geral da seção transversal, e sua discretização pelo método dos elementos finitos. / A fully nonlinear geometrically exact multi-parameter rod model that incorporates general in-plane and out-of-plane cross-sectional changes, and its discretization by Finite Element Method.
The main purpose of this work is to present a fully nonlinear geometrically-exact multi-parameter rod model that incorporates general in-plane cross-sectional changes as well as general out-of-plane cross-sectional warping. The formulation constitutes an extension of the earlier works presented in [1] to [6], [8] and [9], in the sense that the restrictions t
Publicado em: 2008
-
6. Numerical simulation of welding with application on the dynamic behavior characterization of welded structures / SimulaÃÃo numÃrica da soldagem com aplicaÃÃo à caracterizaÃÃo do comportamento dinÃmico de estruturas soldadas
Nowadays, welded structures are widely employed in engineering design. Generally, these structures have internal stresses (residual stresses) generated by the thermal cycle to which these parts are submitted during welding process. In many cases, these stresses are not minimized by means of thermal treatment. Thus, one must take into account the residual str
Publicado em: 2006
-
7. Sobre a modelagem da propagação de trincas por fadiga em estruturas de cascas pressurizadas. / On the modeling of fatigue crack propagation in pressurized shell structures.
The modeling of fatigue crack growth in pressurized fuselages is very complex due to many factors, such as the nonlinear stiffening effect referred to as bulging, the fuselage skin being very thin and the presence of stiffeners which modifies the stress distribution on the fuselage. A methodology for the computational modeling of the fatigue crack growth in
Publicado em: 2006
-
8. AnÃlise de adutora aÃrea metÃlica protendida / Analysis of prestressed steel pipeline
The aim of the present work is to present the analysis of the real case of a prestressed steel pipeline. In this solution the steel pipe is the supporting structure with the help of high strength steel cables that are previously prestressed by hydraulic jacks in a configuration designed to exert on the pipe forces that oppose the loading due to the transport
Publicado em: 2004
-
9. A three layer quasi 3D finite element model for structural analysis of sandwich plates.
A three-layer finite element model for the analysis of sandwich plates with laminated composite face-sheets is evaluated. In the model, the face-sheets are represented as Reissner-Mindlin plates and the core is modeled as a three-dimensional continuum. This representation allows accurate modeling for a wide range of core types. The three-dimensional problem
Publicado em: 2002
-
10. Modelagem de vigas de compósitos laminados usando elementos finitos formulados na notação strain gradient
This work analyzes laminated .composite beams using finite elements formulated in strain gradient notation, which is a physically interpretable notation. Strain Gradient notation allows for the evaluation of modeling capabilities of finite elements, as well as for the identification and elimination of modeling errors a-priori. Initially a literature review i
Publicado em: 2002
-
11. Osmotic Stress Suppresses Cell Wall Stiffening and the Increase in Cell Wall-Bound Ferulic and Diferulic Acids in Wheat Coleoptiles.
The relationship between the mechanical properties of cell walls and the levels of wall-bound ferulic (FA) and diferulic (DFA) acids was investigated in wheat (Triticum aestivum L.) coleoptiles grown under osmotic stress (60 mM polyethylene glycol [PEG] 4000) conditions. The cell walls of stressed coleoptiles remained extensible compared with those of the un
-
12. Xylem Wall Collapse in Water-Stressed Pine Needles
Wall reinforcement in xylem conduits is thought to prevent wall implosion by negative pressures, but direct observations of xylem geometry during water stress are still largely lacking. In this study, we have analyzed the changes in xylem geometry during water stress in needles of four pine species (Pinus spp.). Dehydrated needles were frozen with liquid nit
The American Society for Plant Biologists.