Stress concentration occurs
at the junction of two different diameters or around discontinuities like holes At these places the stress value increases more than the average values
. It is more pronounced in dynamic loading.
What is meant by stress concentration explain how its value can be reduced?
Additional Notches and Holes in Tension Member
It is observed that a single notch results in a high degree of stress concentration. The severity of stress concentration is reduced by three methods:
(a) Use of multiple notches
, (b) Drilling additional holes; and (c) Removal of undesired material.
What is meant by stress concentration?
A stress concentration, also known as a stress riser/raiser, is
a point in a part where the stress is significantly greater than its surrounding area
. Stress concentrations occur as a result of irregularities in the geometry or within the material of a component structure that cause an interruption of the stress flow.
What is stress concentration What are the causes of it what are the methods of reducing it?
Stress concentrations occur
when there are irregularities in the geometry or material of a structural component that cause an interruption to the flow of stress
. This arises from such details as holes, grooves, notches and fillets. Stress concentrations may also occur from accidental damage such as nicks and scratches.
What do u mean by stress concentration & How will you mesh for such regions?
A stress concentration is
a place of the mesh where the stress raises above the applied nominal stress
. It behaves in a similar fashion than stress singularities, but the stress will converge towards a finite value, not infinite, given that the mesh is sufficiently refined.
How can I reduce my stress concentration?
- Include gradual transitions in the design. The most common cause of stress concentrations is an abrupt change in geometry or an abrupt shape transition. …
- Use relief notches. …
- Opt for several small relief notches as opposed to a single long one. …
- Avoid sharp corners.
What are the effects of stress concentration?
When a body has stress concentration in it,
the chances of its failure increases
. The body tends to fail from the place where it has more concentration of stress. A body has less life that has more irregularities within it. In order to increase the life of the body, the intensity of stress should be reduced.
In which of the following case stress concentration factor is ignored?
In which of the following case stress concentration factor is ignored? Explanation: In
ductile materials under static load
, there is plastic deformation near yielding point and hence redistribution of stresses take place.
What is nominal stress?
Stress
calculated on the basis of the net cross section of a specimen without taking into
account the effect of geometric discontinuities such as holes, grooves, fillets, etc.
What is normal stress?
When a force acts perpendicular (or “normal”) to the surface of an object
, it exerts a normal stress. When a force acts parallel to the surface of an object, it exerts a shear stress.
Why stress concentration factor is important?
Stress concentration factor (Kt), is a dimensionless factor which is used to quantify how concentrated the stress is in a material. … So it is important
to analyze the component for stress concentration in order to have proper functioning of the component with safety
.
What is a stress riser orthopedics?
Abstract. Background: A stress-riser fracture
develops when stress in an object is higher than that in the surrounding material
. The aim of this retrospective study was to evaluate all consecutive femoral stress-riser fractures during a period of >10 years and to verify high-risk factors by using mechanical analysis.
What is the meaning of stress singularity at a point?
A stress singularity is
a point of the mesh where the stress does not converge towards a specific value
. As we keep refining the mesh, the stress at this point keeps increasing. Theoretically, the stress at the singularity is infinite!
What causes stress singularity in FEA?
Typical situations where stress singularities occur are
the appliance of a point load, sharp re-entrant corners, corners of bodies in contact and point restraints
. As you can see, stress singularities are a common situation in FEA.
What is peak stress in Ansys?
Peak stress is
the total stress minus the membrane plus bending stress
.
Do chamfers reduce stress concentration?
Fillets generally give a lower stress concentration factor than chamfers
. Chamfers are more forgiving when fitting mating parts. i.e. even if there are inaccuracies in a chamfer mating parts might fit together. But if the radius of fillet changes it will be difficult to fit the mating parts.
