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 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 are the causes of stress concentration Mcq?
- A. Variation in properties of material from point to point in a member.
- Pitting at points or areas at which loads on a member are applied.
- Abrupt change of section.
- All of the above.
Where is the stress in concentration?
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 . Stress concentrations occur as a result of irregularities in the geometry or within the material of a component structure that cause an interruption of the stress flow.
What is stress concentration Its Causes & Remedies?
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 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.
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 .
Which is the correct relationship of gears?
Explanation: It is the ratio of the pitch circle diameter in millimeters to the number of teeth. It is usually denoted by m. Mathematically, Module, m = D /T .
Is type of load affects factor of safety?
Type of load affects factor of safety. Explanation: Dynamic load has higher factor of safety as compared to static loading. 3. For cast iron components, which of the following strength are considered to be the failure criterion?
Which of the following devices is used to reduce stress concentration?
Explanation: All the mentioned options reduce the sharp bending of a force flow line. This discussion on Which of the following reduces the stress concentration? a) Use of multiple notchesb )Drilling additional holesc)Removal of undesired materiald)Each of the mentionedCorrect answer is option ‘D’.
Do chamfers reduce stress concentration?
Fillets generally give a lower stress concentration factor than chamfers . Chamfers are more forgiving when fitting mating parts. i.e. even if there are inaccuracies in a chamfer mating parts might fit together. But if the radius of fillet changes it will be difficult to fit the mating parts.
How can the concentration of stress be reduced in holes?
Make radii in a load path as large as you are comfortable making them. Limit the ratio of the large feature to the small feature, where possible. Add stress-reducing holes at the end of slits, sharp angles , or cracks to relieve high stress concentrations.
What is normal stress?
A normal stress is a stress that occurs when a member is loaded by an axial force . The value of the normal force for any prismatic section is simply the force divided by the cross sectional area. A normal stress will occur when a member is placed in tension or compression.
What are the modes of fracture?
In fracture mechanics, there are three types of fracture: mode I (tensile fracture) , mode II (shear fracture), and mode III (out-of-plane tearing fracture) [20–29].
What is factor of safety and working stress?
Factor of Safety (FOS) for structural applications is the ratio of the allowable working unit stress, allowable stress or working stress . ... The ultimate strength of a given material divided by an arbitrary factor of safety, dependant on material and the use to which it is to be put, gives the allowable stress.
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.
