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Difference between Stress relaxation test and creep test?
MAHESHAKN
Creep - increase in deformation while load is cst Relaxation - decrease in load while deformation is cst.
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How does Creep happen?
Creep usually occurs as a result of thermal and physical stress overcoming the elasticity of the metal preventing it from returning to its original shape after the stress is removed.
When a material is loaded within elastic limit the what is proportional to the what produced by the stress?
The displacement is proportional to the strain. This does not factor for creep and time.
What is scope creep in project management?
Scope creep refers to scope changes applied without processing them though the change control process. The role of the Project Manager is to ensure that Scope Creep does not happen in their project. As per the PMBoK guide, the Control Scope process is used to control the projects scope.
When a project scope has a tendency to increase - known as?
Scope creep
Ultimate strength of steel in tension and shear?
Static and Dynamic Yield Stress: What's the difference and which should I use?The most commonly used method for obtaining a yield stress value is to shear the sample over a range of shear rates, plot the shear stress as a function of shear rate and fit a curve (various models are available) through the data points (see fig 1).The intersection on the stress axis is then taken as the yield stress, the assumption being that any stress below this is insufficient to cause the sample to flow. Rheologists call this a dynamic yield stress; we are looking at the sample in motion (i.e. under shear) and extrapolating from this how it behaves when not in motion.However, there's more than one way to skin a cat! Another approach is to start with the sample in its at-rest state (zero shear) and incrementally increase the stress until we identify at value at which it starts to flow i.e. we record non-zero shear rate (see fig 2)We call this value a static yield stress - the stress at which we initiate flow - and it is usually considerably higher than its dynamic counterpart for any given product. In reality the sample is undergoing creep flow below this stress but we can assume for many practical purposes that it is static. This test can be performed with a quick (non-equilibrium) stress ramp on a controlled stress rheometer or a constant rate test on a vane-based tester.So which yield stress should you use?Well it depends on what you need to know. A good starting point is to match the test type to the flow process of interest: If you are interested in how a fluid stops flowing after shear (such as screen printing, dip coating, enrobing or slumping) then the dynamic yield stress is a key determinant. On the other hand if you are interested in how hard you need to push to get the fluid moving in the first place (spreadability of butters, texture of tubs of cream, mixer and pump start-up etc) then the product's static yield stress will prove a major factor.
What has the author Ivan Avgustovich Oding written?
Ivan Avgustovich Oding has written: 'Creep and stress relaxation in metals'
What is difference between a landslide and a creep?
one is water and the other is land
What is difference between landslide and creep?
Mass movement is a fast process in the formation of landslides.Mass movement is a slow process in the formation of creep.
What is the different between fatigue and creep?
Both Fatigue and Creep are causes of failure of a material at a stress value significantly below the Allowable threshold. They differ from each other in the sense that fatigue is defined as the failure of a material, subjected to multiple loading and unloading cycles, even though, in none of the instances, the applied stress crosses the Allowable stress value. The fatigue life of a material is usually specified in # of loading/unloading cycles it can undergo, without failing. The fatigue life decreases as the applied stress approaches the Allowable Stress. CREEP, on the other hand, is time related failure of a material. Creep, explains that a material subjected to a certain applied stress will continue to deform at that constant stress value. Hence, creep results in an increase in strain value while the stress is constant, until it causes the failure of the subject material. CREEP tends to increase with the temperature of the specimen
What has the author Y M Haddad written?
Y. M. Haddad has written: 'Viscoelasticity of engineering materials' -- subject(s): Plastics, Elastic solids, Polymers, Stress relaxation, Wave-motion, Theory of, Materials, Viscoelasticity, Creep
What is the difference between a creep and a mudflow?
1.soil creep is a slow process where as mud flow is a sudden and fast process. 2.soil creep doesn't cause any disaster where as mud flow is disastrous.
How does Creep happen?
Creep usually occurs as a result of thermal and physical stress overcoming the elasticity of the metal preventing it from returning to its original shape after the stress is removed.
How necking give rise to tertiary creep?
Necking, or deformation under tension, contributes to tertiary creep in that necking exponentially increases the stress on the solid material.
What has the author Sharad A Patel written?
Sharad A. Patel has written: 'Creep behavior of columns' 'Stress distribution in beams of thin-walled sections in the presence of creep' 'Torsion of cylindrical and prismatic bars in the presence of primary creep'
What is creep caused?
It can be caused by GRAVITY as in the case of old lead pipe sagging. In addition copper contact wires in electrified transport systems sagging under permanent stress causes creep.
Creep is cause by what?
It can be caused by GRAVITY as in the case of old lead pipe sagging. In addition copper contact wires in electrified transport systems sagging under permanent stress causes creep.
Can a solid flow or is it just liquids and gases?
Yes; this phenomenon is called creep and is accelerated at high temperatures and/or under stress.
