Stress concentration factor equation
What is the stress concentration factor?
The stress concentration factor, , is the ratio of the highest stress to a nominal stress of the gross cross-section and defined as. Note that the dimensionless stress concentration factor is a function of the geometry shape and independent of its size.
Are stress concentration factors independent of thickness?
The difference between mid plan and surface value of stress concentration factor is not a monotonic function of thickness. After its maximum value, it decreases gradually with increasing B/a and tends to a constant value corresponding different Poisson’s ratio when B/a becomes large enough.
What is KT stress analysis?
A stress concentration factor (Kt) is a dimensionless factor that is used to quantify how concentrated the stress is in a mechanical part. It is defined as the ratio of the highest stress in the part compared to a reference stress.
What is the difference between stress concentration factor and stress intensity factor?
Stress concentration factor is used for notched specimen (or can say object having abruptly changing cross-section like T section, I section , hole etc.). This depend on dimension only not on loading condition. Stress intensity factor accounts for asymptotic stress variation. How stresses varies near the crack tip.
How can I reduce my stress concentration?
1: Reducing Stress ConcentrationsAvoiding sharp corners and only using rounded corners with maximum radii.Sanding and polishing surfaces to remove any notches or defects that occur during forming and processing.Lowering the stiffness of straight load-bearing segments.Placing notches and threads in low-stress areas.
What is the concentration factor?
concentration factor The amount by which an element must be increased above its normal crustal abundance in an ore to make it commercially extractable. A Dictionary of Earth Sciences. × “concentration factor .”
How do you avoid stress concentration in Ansys?
Some common issues to avoid are:Do not use sharp corners along a load path.Do not make a large size transition between loaded features. Don’t assume that the same size radius works for all features. Don’t place a stress concentration in a high cyclic load if you absolutely must use a sharp corner.
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 SN curve?
S of S-N curve stands for “Stress”. That means repeatitive load. N stands for “Number of cycles to failure”. S describes a vertical axis and N describes a cross axis. The smaller stress even causes fatigue fracture.
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.
Why do fillets reduce stress?
In mechanical engineering a fillet is a rounding of the interior or exterior corner of a part. Fillets are mainly used to reduce stress concentration compared to chamfers. These can easily distribut stress more uniformly.
Is stress intensity factor negative?
Abstract: The values of the stress intensity factor (SIF) KI are almost always negative in the substrate of the gear teeth, due to the compressive stresses field. Instead, SIF KII is determinant in the growth rate of the fatigue crack by mode II, in terms of compressive stresses field.