What is the maximum stress concentration factor?
A stress concentration factor is the ratio of the highest stress (smax)) to a reference stress (s) of the gross cross-section. As the radius of curvature approaches zero, the maximum stress approaches infinity. Note that the stress concentration factor is a function of the geometry of a crack, and not of its size.
How do you calculate stress concentration factor?
Stress Concentration Factors
- w = bar width.
- d = hole diameter.
- t = bar thickness.
- F = applied force (tensile or compressive)
How do you calculate stress in a hole in the plate?
The Stress Concentration Factor, Kt , is the ratio of maximum stress at a hole, fillet, or notch, (but not a crack) to the remote stress. For our case of a hole in an infinite plate, Kt=3. K t = 3.
Can stress concentration factor be less than 1?
Basic stress analysis calculations assume that parts are smooth, have a uniform cross-section, and have no irregularities. If the material is flawless with no discontinuities, then the stress concentration factor is 1. If there is a discontinuity, then the stress concentration factor is greater than 1.
What causes 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 fluctuating stress?
The components are subjected to forces, which are not static, but vary in magnitude with respect to time. The stresses induced due to such forces are called Fluctuating Stresses. The most popular model for stress–time relationship is the sine curve.
In which of the following cases 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 can understand by the factor of safety equal to 1?
5. What can understand by the factor of safety equal to one? Explanation: When the factor of safety is one it means that the ultimate stress is equal to the working stress and therefore the body can only support load up to actual load and no more before failing.
When solid comes to stress reduction which one is preferred?
When comes down to stress reduction, which one is preferred? Explanation: The arms are free in split flywheel to contract and hence are better for stress reduction.
What cycles range is chosen for endurance limit?
8. What cycles range is chosen for endurance limit? Explanation: In nonferrous materials, non-effective fatigue limit is shown. The stress corresponding to 107 – 108 cycles is taken as endurance limit.
What is the difference between endurance limit and fatigue strength?
The Fatigue refers to the failure of the machine component due to the repeated or cyclic loading. Whereas the fatigue strength or fatigue limit or Endurance limit is used to describe the material property that the cyclic load can be applied to the material without causing the failure.
What increases fatigue life?
Raising the test temperature from 0 °C to 22 °C in a dry nitrogen environment increases fatigue life; this is in agreement with the hypothesis of stress being the failure driver.
What do you call the time dependent yield?
Question 13 Time Dependent Yield Is Known As Fracture Creep None That Mentioned Eaticas.
What is the time dependent permanent deformation called?
Creep – this is the permanent deformation of a body due to persistent stress. This stress can be tensile, compressional, torsional or other mechanical stress. As mentioned, as creep is due to persistent stress, it is time dependent. Hence, creep is the correct answer.
Does stress depend on material property?
By definition stress is a force acting on an area, σ = F A . So material properties does not come into play.
How do you calculate failure stress?
We calculate the stress, using the stress formula: σ = F/A = 30*10³ / (1*10⁻⁴) = 300*10⁶ = 300 MPa . Finally, we divide the stress by strain to find the Young’s modulus of steel: E = σ/ε = 300*10⁶ / 0.0015 = 200*10⁹ = 200 GPa .