Preload
Mostrando 1-12 de 80 artigos, teses e dissertações.
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1. XFEM Modelling in Multi-bolted Joints Using a Unified Bolt Preload
Abstract Multi-bolted joints are adopted and designed to provide efficient load transfer within assembled engineering parts. Bearing failure is favorable during design phase due to more progressive failure mode, however, ability of by-pass stress to be transferred to adjacent bolts in multi-bolted joints prone to catastrophic net-tension failure. Former appr
Lat. Am. j. solids struct.. Publicado em: 04/02/2019
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2. Numerical simulation of bolted connections
Abstract This article presents the modeling of a complete bolted connection based on a model with one bolt connecting two or three plates. Initially, the behavior of this model with one bolt is analyzed by comparing it with existing bibliography for 3 different types of applied load: tension, shear and a combination of these two. This model includes all nece
Lat. Am. j. solids struct.. Publicado em: 22/10/2018
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3. Experimental Evaluation of Low-Pass Shock Isolation Performance of Elastomers Using Frequency-Based Kolsky Bar Analyses
Abstract Elastomeric materials are used as shock isolation materials in a variety of environments to dampen vibrations and/or absorb energy from external impact for minimizing energy transfer between two objects or bodies. Some applications require the shock isolation materials to behave as a low-pass mechanical filter to mitigate the shock/impact at high fr
Lat. Am. j. solids struct.. Publicado em: 2017-03
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4. An Indirect Method to Measure Abutment Screw Preload: A Pilot Study Based on Micro-CT Scanning
Resumo Este estudo teve como objetivo medir a pré-carga em diferentes conexões implante/pilar baseado em imagens de micro-CT. Implantes de hexágono externo (EH) e Cone Morse (MT) (n = 5) foram utilizados para a medição de pré-carga. Os parafusos de pilares foram digitalizados em um micro-CT de alta resolução para obter seus modelos virtuais, que fora
Braz. Dent. J.. Publicado em: 2015-12
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5. Numerical and theoretical studies of bolted joints under harmonic shear displacement
A three-dimensional finite element model used to simulate the bolted joint is created using ABAQUS package. The stress concentration factors at the roots of the thread are first studied with a preload of 38.4 kN. Under harmonic transverse shear displacement, not only the stress variations at ten specified points of the first thread but also contact condition
Lat. Am. j. solids struct.. Publicado em: 2015-01
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6. Influence of surrounding wall thickness on the fatigue resistance of molars restored with ceramic inlay
The purpose of this study was to evaluate the influence of buccal and lingual wall thickness on the fatigue resistance of molars restored with CAD/CAM ceramic inlays. Forty human third molars were selected and divided into 4 groups, according to the remaining surrounding wall thickness chosen for inlay preparation (n = 10): G1, 2.0 mm; G2, 1.5 mm; G3, 1.0 mm
Braz. oral res.. Publicado em: 11/06/2014
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7. A eritropoietina protege a função sistólica de corações neonatais submetidos a isquemia e reperfusão regional : trabalho experimental / Erythropoietin protects the systolic function of neonatal hearts against ischemiareperfusion injury
Background: The effect of erythropoietin (EPOT) on neonatal hearts is not well understood. The current hypothesis is that erythropoietin has protective effects against ischemia-reperfusion when administered prior to ischemia induction. Methods: Systolic and diastolic indices, as well as the Akt and extracellular regulated kinase (ERK) signaling pathways, wer
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2012
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8. A procedure for the parametric identification of viscoelastic dampers accounting for preload
Passive vibration isolators are usually made of viscoelastic materials. These materials have non-linear characteristics that change their dynamical properties with temperature, frequency and strain level. The vibration isolator's mathematical modeling and optimal design require the prior knowledge of the stiffness and damping of the applied viscoelastic mate
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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9. A Procedure for the Parametric Identification of Viscoelastic Dampers Accounting for Preload
Passive vibration isolators are usually made of viscoelastic materials. These materials have non-linear characteristics that change their dynamical properties with temperature, frequency and strain level. The vibration isolator’s mathematical modeling and optimal design requires the prior knowledge of the stiffness and damping of the applied viscoelastic m
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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10. Clinical evaluation of the flotrac/vigileo™ system for continuous cardiac output monitoring in patients undergoing regional anesthesia for elective cesarean section: a pilot study
BACKGROUND: Spinal anesthesia for cesarean delivery may cause severe maternal hypotension and a decrease in cardiac output. Compared to assessment of cardiac output via a pulmonary artery catheter, the FloTrac/Vigileo™ system may offer a less invasive technique. The aim of this study was to evaluate cardiac output and other hemodynamic measurements made us
Clinics. Publicado em: 2010-06
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11. Desajuste marginal e influencia na pre-carga de parafusos e nas tensões induzidas as fixações de pilares metaloplasticos sobre-fundidos / Marginal misfit and influence in the pre-load and the stress-induced setting of the metaloplastic abutments
Castable UCLA abutments are of wide applicability in dental implants, because they allow the manipulation in the laboratory at low cost and individualization of abutments for each patient. However, they show the worse results of marginal adaptation then the fabricated, although these aggregate costs significantly higher. UCLA premachined abutments for castin
Publicado em: 2010
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12. Vasodilation increases pulse pressure variation, mimicking hypovolemic status in rabbits
OBJECTIVE: To test the hypothesis that pulse pressure respiratory variation (PPV) amplification, observed in hypovolemia, can also be observed during sodium nitroprusside (SNP)-induced vasodilation. INTRODUCTION: PPV is largely used for early identification of cardiac responsiveness, especially when hypovolemia is suspected. PPV results from respiratory vari
Clinics. Publicado em: 2010