What does stress concentration factor depend on?
The value of the stress-concentration factor depends on the geometry of the part only and is independent of the material used. For this reason, it is called a theoretical or geometric stress-concentration factor.
Table of Contents
What does stress concentration factor depend on?
The value of the stress-concentration factor depends on the geometry of the part only and is independent of the material used. For this reason, it is called a theoretical or geometric stress-concentration factor.
What is a stress concentration factor and why is it important?
Why Understanding the Stress Concentration Factor (Kt) is Important When Evaluating Corrosion in Metal Structures. Corrosion damage, such as pitting, results in the magnification of local stresses around cracks and cavities due to stress concentration.
How will you reduce stress concentration in keyway?
(a). The keyway is a discontinuity and results in stress concentration at the corners of the keyway , therefore holes are drilled to minimise the stress concentration at the corners of keyway as shown in fig (b).
What do you mean by stress concentration What are the methods of reducing it?
Stress concentration reduction in machine parts usually involves providing a smooth path for stress to flow through the component. This can be achieved by several methods, including reducing sharp corners and providing relief notches.
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.
Can you ignore stress concentrations?
The conclusion for an FEA result, following on from the hand calculation approach, should perhaps be similar; we can ignore the localized stress and deal with nominal stresses.
Which of the following reduces the stress concentration?
8. Which of the following reduces the stress concentration? Explanation: All the mentioned options reduce the sharp bending of a force flow line.
What is a stress concentration factor?
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 stress concentration factor?
How do you avoid stress singularity?
Common solutions
- Ignore the singularity: The “big” one. There is some merit to it.
- Add an area: This is a reasonable choice but you can’t apply it all the time.
- Model a fillet: I really dislike this.
- Make a smaller separate model: This makes sense in some cases.
- Use nonlinear material: This is actually a great option.
Why are corners stress concentrators?
Geometric discontinuities cause an object to experience a localised increase in stress. Examples of shapes that cause stress concentrations are sharp internal corners, holes, and sudden changes in the cross-sectional area of the object as well as unintentional damage such as nicks, scratches and cracks.
Is it possible to reduce the concentration of stress concentration?
These methods will not eliminate the complete stress concentration completely, but they can reduce the concentration to some extent. Following are the different design possibilities of the same component with the stress flow line shown within the body.
How do you reduce the amount of stress in a part?
Smoothing out critical areas of the part design influences the flow of stress and prevents stress from accumulating in one location. 2. Use relief notches Designers can also alleviate stress concentrations by removing material near notches, creating an additional groove called a relief notch.
What are the stress concentration factors?
• Two different definitions of the stress concentration factors are in common use: -based on the gross stress : (σ gremains constant as aincreases) -based on the net stress: (σ nincreases as aincreases) tD P Kg g g yy t* where max =σ= σ σ *( 2 ) whe re max t Da P Kn n n yy t− = σ= σ σ 2a D P P Prof. M. E. Tuttle University of Washington
How can stress concentration of a single notch be reduced?
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 bar of circular cross-section with a shoulder and subjected to bending moment is shown in Fig. (a). Ball bearings, gears or pulleys are mounted against this shoulder.
