Stress relaxation Research Papers - Academia.edu (original) (raw)

The effect of corrosive solutions on stress relaxation behavior of pure Mg and its alloys is studied. Pure magnesium shows a crucial corrosion stress relaxation in 3.5wt.% NaCl even at room temperature in comparison with tests in air. Die-cast Mg alloys AZ91D, AM50 and AS21 at room temperature show a relatively small stress decrease both in air and in different

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- Stress relaxation, Magnesium, Dislocations, Grain Boundary
- by Ken Quail
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- Engineering, Biological Sciences, Stress relaxation, Cereal Science
- by Cumhur KILINCER
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- Biomedical Engineering, Orthopaedic, Elasticity, Stress relaxation
- by Albert Fan Yee
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- Engineering, Stress relaxation, bisphenol A, Macromolecules
- by Guy Schlatter
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- Engineering, Viscoelasticity, Molecular Mechanics, Polymer
- by Elias Aifantis
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- Materials Science and Engineering, Stress relaxation
- by David Pichora
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- Biomedical Engineering, Orthopaedic, Stress relaxation, Humans

In this paper a complete rheological characterisation of bread dough added with water-solvable pentosans is showed. In the literature several works are available showing the chemical and physical effect of pentosan addition but it is still matter of discussion of their effect on the mechanical properties of dough. Therefore, the main objective is to further study this point, evaluating the effect of pentosans on the rheological properties of dough, using fundamental measurements and rheological modelling. Small amplitude oscillations at different temperatures were performed to evaluate material properties and stress relaxation tests, either within or out of the linear range, were used to investigate the effect of large deformations on material structure. Results showed that the effect of the addition is variable, depending on the amount, type of pentosans and deformation amplitude. The obtained results, together with rheological modelling, allow either to design dough having controlled properties during critical manufacturing steps (e.g. leavening or baking) or to reduce mechanical properties variability as effect of natural variation in flour characteristics.

- by Domenico Gabriele
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- Chemical Engineering, Food, Stress relaxation, Oscillations
- by A. Amine Benzerga
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- Engineering, Materials Engineering, Mechanical Engineering, Civil Engineering
- by Robert Wimpory and +2
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- Sensitivity Analysis, Neutron Diffraction, Finite Element, Feasibility Study
- by Eric Chason
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- Engineering, Kinetics, Applied Physics, Stress relaxation
- by F. Louchet
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- Crystal Growth, Numerical Simulation, Stress relaxation, Thermal Stress
- by mauro moresi
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- Food Engineering, Stress relaxation, Work Stress, Spectrum
- by Roberto Ballarini
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- Biophysical Chemistry, Biological Sciences, Elasticity, Stress relaxation
- by Suleyman Ozcelik
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- Engineering, Atomic Force Microscopy, Stress relaxation, Physical sciences
- by Marinella Levi
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- Materials Engineering, Chemical Engineering, Stress relaxation, Glass Transition
- by Anthony Watts
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- Multidisciplinary, Stress relaxation, Canary Islands, Surface Area
- by D. Northwood
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- Materials Engineering, Mechanical Engineering, Creep, Stress relaxation
- by Apostolos Thomareis
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- Stress relaxation, Food Sciences, Apparent Viscosity, Food Properties
- by M. Ginic-Markovic and +1
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- Analytical Chemistry, Stress relaxation, Spectrum, Time Dependent

Biomechanics is gaining relevance as complementary discipline to structural and cellular biology. The response of cells to mechanical stimuli determines cell type and function, while the spatial distribution of mechanical forces within the cells is crucial to understand cell activity. The experimental methodologies to approach cell mechanics are diverse but either they are effective in few cases or they rule

- by José Toca-herrera
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- Mechanical Engineering, Biomedical Engineering, Microscopy, Biomechanics
- by Rodrigo Morales
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- Chemical Engineering, Meat Science, Animal Production, Stress relaxation
- by René Borst
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- Stress relaxation
- by Costas Biliaderis
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- Chemical Engineering, Food, Stress relaxation, HPLC
- by Mike Wilson
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- Materials Engineering, Chemical Engineering, Modeling, Comparative Study

This is a preview of the book Ainslie Meares on Meditation by Owen Bruhn.
The book includes a
- biography of Meares,
- a distilled version of Relief Without Drugs by Ainslie Meares,
- his later refined meditation method,
- his personal and teaching protocols,
- 33 samples of his koan like poetry from all 11 poetry books.
- 200 footnoted references from Meares 34 books and hundreds of articles.

- by Owen Bruhn
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- Evolutionary Biology, Positive Psychology, Health Psychology, Psychiatry
- by ramesh babu
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- Engineering, Viscoelasticity, Kinetics, Rheology
- by Ernest Rutter
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- Multidisciplinary, Strain Rate, Stress relaxation, Grain size

We present new Re–Os molybdenite age data on three porphyry Cu–Mo–Au deposits (Yulong, Machangqing, and Xifanping). These deposits are associated with the Himalayan adakitic magmatism that occurred in a continental collision environment, controlled by large-scale Cenozoic strike-slip faults in the eastern Indo–Asian collision zone. Three distinct episodes of Cu–Mo–Au mineralization are recognized. At Yulong, Re–Os isotopic data of four molybdenite

- by Zengqian Hou
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- Geology, Geochemistry, Stress relaxation, Large Scale
- by Yo Tomota
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- Materials Engineering, Mechanical Engineering, Strain Rate, Stress relaxation
- by Kevin Fancey
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- Engineering, Materials Science, Viscoelasticity, Modeling
- by Ian Smith
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- Civil Engineering, Structural Engineering, Stress relaxation, Stochastic Local Search
- by Costas Biliaderis and +1
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- Food Engineering, Stress relaxation, Regression Analysis, Quality Attributes

Cyclic plastic deformation phenomena include the Bauschinger effect, cyclic hardening/softening, strain range effect, loading history memory, ratcheting, mean stress dependent hardening, mean stress relaxation and non-proportional hardening. In this work, different cyclic plastic deformation responses of piping materials (SA333 C–Mn steel and 304LN stainless steel) are experimentally explored. Cyclic hardening/softening is depends upon loading types (i.e. stress/strain controlled), previous loading history and strain/stress range. Pre-straining followed by LCF and mean stress relaxation shows similar kind of material response. Substantial amount of non proportional hardening is observed in SA333 C–Mn steel during 90° out of phase tension-torsion loading. During ratcheting, large amount of permanent strain is accumulated with progression of cycles. Permanent strain accumulation in a particular direction causes cross-sectional area reduction and which results uncontrollable alteration of true stress in engineering stress controlled ratcheting test. In this work, true stress control ratcheting on piping materials has been carried out in laboratory environment. Effects of stress amplitude and mean stress on the ratcheting behaviors are analyzed. A comparison has also been drawn in between the true and engineering stress controlled tests, and massive difference in ratcheting life and strain accumulation is found.

- by Surajit Kumar Paul
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- Materials Engineering, Mechanical Engineering, Civil Engineering, Mechanics
- by G. Ayoub
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- Materials Engineering, Mechanical Engineering, Civil Engineering, Plasticity

Mixtures of xanthan and guar gum in aqueous solution were studied in two flow situations: simple shear and porous media. In addition, solids transport in vertical annular flow of sand suspensions was explored. The zero shear rate viscosity of the solutions displayed a pronounced synergy: the viscosity of the mixture is higher than that of the polymer solutions in a wide range of relative concentrations of the two polymers, in agreement with previous literature. However, at relatively high shear rates, the viscosity approaches the value of the more viscous xanthan gum solutions at mass fractions of xanthan gum between 0.1 and 0.15, and the degree of synergy substantially decreases. Stress relaxation experiments in simple shear indicate that the polymer mixtures exhibit a well-defined yield stress after relaxation that is absent in solutions of pure polymers. In porous media flow experiments, a synergistic behavior mimicking the shear flow results was obtained for the polymer mixtures at low shear rates. However, at a critical shear rate, the apparent viscosity in porous media flows exceeds the shear viscosity due to the elongational nature of flow in the pores. The solids transport capacity in annular flows is well-represented by trends in shear viscosity and stress relaxation behavior. However, the lack of viscosity synergy at high shear rates limits the applicability of the mixtures as a way to improve solids suspension capacity in annular flows.

- by Nestor Ramirez
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- Mechanical Engineering, Chemical Engineering, Stress relaxation, Porous Media
- by Steven Mulvaney
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- Engineering, Biological Sciences, Stress relaxation, Bread Wheat

The seismic sequence occurred in the Abruzzo Apennines near L'Aquila (Italy) in April 2009 caused extensive damage and a large number of casualties (close to 300). The earthquake struck an area in the Italian Apennines chain where several faults, belonging to adjacent seismotectonic domains, create a complex tectonic regime resulting from the interaction among regional stress build-up, local stress changes

- by Folco Pingue
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- Stress relaxation, Dislocations, Seismic Risk, Stress Transfer
- by Steven Mulvaney and +1
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- Mechanical Engineering, Chemical Engineering, Stress relaxation, Steady state
- by Wenhui Chew
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- Viscoelasticity, Failure Analysis, Stress relaxation, Conference
- by Paul Steeman
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- Mechanical Engineering, Chemical Engineering, Stress relaxation, Polypropylene
- by David Lange and +2
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- Stress relaxation
- by Robert Brockman
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- Materials Engineering, Mechanical Engineering, Plasticity, Modeling
- by Elida Hermida
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- Engineering, Stress relaxation, CHEMICAL SCIENCES
- by Kristoffer Almdal and +1
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- Materials Engineering, Chemical Engineering, POlymer degradation and stability, Stress relaxation

The morphology and stress relaxation of coextruded five-layer LLDPE (linear low-density polyethylene)/EVA (ethylene-vinyl-acetate) copolymer films were studied. Increasing VA (vinyl acetate) content in EVA causes a decrease of shrink tension in the films, which can be explained by a decrease in amount of crystallinity. The relaxation time spectrum of the coextruded crosslinked LLDPE/EVA films is similar to the relaxation time spectrum of crosslinked LLDPE film at room temperature. However, at elevated temperatures, an additional peak appears on the spectrum of coextruded film. The cause of this peak is temperature- and stress-induced recrystallization of EVA during the relaxation test. This recrystallization was confirmed with DSC and wide angle X-ray analysis. Polym. Eng. Sci. 44:1716–1720, 2004. © 2004 Society of Plastics Engineers.

- by Yakov Unigovski and +1
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- Materials Engineering, Chemical Engineering, Stress relaxation, polymer science and Engineering
- by Daniel Santana and +1
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- Biomedical Engineering, Medicine, High Frequency, Stress relaxation