Stress, Shear and other things?

In summary, the conversation involves the participant discussing the formulas needed for their homework and asking for help in finding them. They also mention specific problems involving a seat, a post, and a canister made of certain materials. The concept of stress and moment of inertia are also mentioned.
  • #1
darrenfiander
1
0

Homework Statement



We've been given several questions and told to use the internet to find out the formulas for them. But I can not find the right ones anywhere!

If anyone could just give the formulas that's all I need!

A seat is attached by a simple pin of a circular cross section, made from a material with an allowable strength in shear of 100MPa what would be the minimum diameter to withstand a mass of upto 100kg? pin can only penetrate one side

A straight, hollow circular setion post having an outside diamter of 100m and a thickness of 2mm is to be rigidly fixed to the floor at its base to support an object. calculate the second moment of inertia

if the canister is made of aluminium having a youngs modulus of 70gpa and possion ratio of 0.28, calculate the resultant axial and hoop strain it will experience



Homework Equations





The Attempt at a Solution

 
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  • #2
To start you off, you probably know that stress=Force/area. There are two types of stress: normal stress and shear stress. Normal stress is force /area perpendicular to the force. Shear stress is force/area parallel to the force. However, all that needs interpreting in the questions you have been given. I think you need to submit your interpretation before getting more help. The moment of inertia is sometimes termed second moment of area (even though they are conceptually slightly different, it may help you get to where you want to be...
 

FAQ: Stress, Shear and other things?

What is stress and how does it affect the human body?

Stress is a physiological response to a perceived threat or demand. It can manifest as physical, emotional, or cognitive symptoms and can have both positive and negative effects on the body. Acute stress can improve performance and alertness, while chronic stress can lead to negative health outcomes such as high blood pressure and weakened immune system.

What is shear stress and why is it important in materials science?

Shear stress is a type of stress that occurs when two forces act parallel to each other in opposite directions, causing the material to deform. In materials science, shear stress is important because it can cause a material to fail or deform, and understanding its behavior is crucial in designing and engineering strong and durable materials.

Is there a difference between stress and anxiety?

While stress and anxiety are often used interchangeably, there is a distinct difference between the two. Stress is a response to a specific event or situation, while anxiety is a general feeling of fear or worry. Stress is usually short-term and can be managed, while anxiety can be long-term and requires professional treatment.

Can stress be measured?

Yes, stress can be measured through physiological and psychological measures. Physiological measures include heart rate, blood pressure, and cortisol levels, while psychological measures include self-reporting questionnaires and behavioral observations. These measures can help identify the presence and level of stress in an individual.

How can stress be managed?

There are various ways to manage stress, including exercise, relaxation techniques, and seeking support from friends or professionals. It is also important to identify the source of stress and find ways to cope with it, such as time management, setting boundaries, and practicing self-care. Seeking help from a therapist or counselor can also be beneficial in managing stress.

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