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 the cause of stress concentration?
Stress concentrations are most commonly caused by an abrupt change in the part’s geometry , typically around sharp corners, holes, notches, or grooves. Stress concentrations are also more likely to occur in parts with complex or sophisticated designs.
What is stress concentration and 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 . ... 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.
What is stress concentration What are the causes of it what are the methods of reducing it?
Cause: The stress concentration in a body happens because of the sudden change in the geometry of the body due to cracks, sharp corners, holes, decrease in the cross-section area . Due to these irregularities, there is an increase in the intensity of stress in the body.
What is stress concentration What are the methods of reducing stress concentration?
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 stress concentration chart?
A stress concentration factor chart is a graph that shows the relationship between the theoretical stress concentration factor of a particular shape versus its variation in cross section .
How do you find the concentration factor?
The concentration factor formula, based on the percent recovery for an RO system, is useful for calculating the concentration of dissolved substances in the concentrate stream: concentration factor = 1/(1-percent recovery as a decimal) .
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.
What are stress factors?
In general, stress is related to both external and internal factors . External factors include your physical environment, your job, relationships with others, your home, and all the situations, challenges, difficulties, and expectations you’re confronted with on a daily basis.
What is factor of safety and working stress?
It is defined, in general, as the ratio of the maximum stress to. the working stress. Mathematically, Factor of safety = Maximum stress . Working or design stress .
What can help to reduce stress?
- Deep breathing exercises.
- Meditation.
- Mindfulness meditation.
- Progressive muscle relaxation.
- Mental imagery relaxation.
- Relaxation to music.
- Biofeedback (explained below).
- Counseling, to help you recognize and release stress.
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.
Does fillets reduce stress concentration?
Another method used to decrease the stress concentration is by adding a fillet to internal corners . This reduces the stress concentration and results in smoother flow of stress streamlines.
How do you reduce stress concentration in welded joints?
A method for reducing the stress concentration in welded joints is proposed. The method is based on depositing a brazed bead in the weld zone produced from material with a melting point and elasticity modulus lower than those of the parent material.
What is the maximum stress concentration factor?
A stress concentration factor is the ratio of the highest stress (s max )) 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.
What is the formula for stress concentration?
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.
