What is K in stress concentration?
What is K in stress concentration?
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.
How do you calculate stress concentration factor K?
Maximum stress determination will require you to first calculate the stress concentration factor, Kt, that accounts for the reduction of cross- sectional area, and the notch sensitivity, q. q = (Kf –1)/(Kt-1). Generally, q is between 0 and 1. If q is zero, then Kf =1 and the material is not sensitive to notches at all.
How do you calculate KT value?
It is the ratio of urea clearance (K) multiplied by dialysis time (t) to the volume of water in your body. Kt/V values can be improved by either increasing blood flow rate through the dialyser, which increases urea clearance, or by increasing the duration of dialysis sessions.
What is stress concentration write down the causes of stress concentration?
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 is stress concentration factor ratio?
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.
What is fatigue notch factor?
Ratio of fatigue strength of a specimen with no stress concentration to fatigue strength of a specimen with a notch or other stress raisers. Fatigue notch factor is usually lower than the theoretical stress concentration factor because of stress relief due to plastic deformation.
What is KF in fatigue analysis?
KF is a material property for a stress-life fatigue calculation. It is intended to multiply the calculated stress results to account for factors that are not included in the analysis, such as stress-concentrations.
What is K in KT v?
Kt/V is another way of measuring dialysis adequacy. In this measurement, K stands for the dialyzer clearance, the rate at which blood passes through the dialyzer, expressed in milliliters per minute (mL/min)
What is URR and KT V?
Kt/V, like URR, is a measure of dialysis adequacy. K = clearance—the amount of urea your dialyzer can remove (liters/minute) t = time—the duration of treatment (minutes) V = volume—the amount of body fluid (liters)
What is the value of the factor k?
The value of the factor K varies from 1 to about 3 in most cases. K= 1 means no stress concentration, that is, calculated value of stress = actual value of stress. When K = 3, the actual stress is three times the calculated value. The values of stress concentration are provided in chart forms in the textbook (Figures 2-
How is the maximum stress concentration factor calculated?
The maximum stress is calculated as σ max = K t σ nom, where K t is the stress concentration factor as determined from the plot below, and σ nom is calculated as: Cannot display plot — browser is out of date.
What is the formula for no stress concentration?
K= 1 means no stress concentration, that is, calculated value of stress = actual value of stress. When K = 3, the actual stress is three times the calculated value. The values of stress concentration are provided in chart forms in the textbook (Figures 2- 8 to 2-21).
How does change in form affect stress concentration?
Generally, more abrupt the change in geometric form, higher is the stress concentration effect. Because stress concentration increases mechanical stress, a better design approach is to strive to reduce stress concentration effect at the critical stressed areas.
