Understanding Principle Stresses: Calculating X & Y Stress

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Discussion Overview

The discussion centers around understanding principal stresses, specifically how to calculate the stress in the x and y directions and what factors contribute to these stresses in various problems. The scope includes conceptual clarification and practical application in mechanics.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant suggests drawing a free body diagram (FBD) of the element in question to identify the loads that affect the stress calculations in x and y.
  • Another participant mentions that understanding this topic falls under elasticity theory and implies that further reading may be beneficial.
  • A later reply challenges the tone of the previous comment, advocating for a more supportive approach to the original question and offering to provide additional resources via private message.

Areas of Agreement / Disagreement

There appears to be a mix of supportive and critical responses, with no clear consensus on the best approach to answering the original question. Some participants emphasize the importance of practical steps like drawing an FBD, while others suggest theoretical reading.

Contextual Notes

Participants have not fully explored the assumptions behind the calculations or the specific definitions of stress in this context, leaving some ambiguity in the discussion.

Who May Find This Useful

Individuals studying mechanics, engineering students, or those interested in the application of elasticity theory may find this discussion relevant.

2slowtogofast
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I need some help understanding principle stresses.
I understand the formula i have problems calculating the stress in x and the stress in y to plug into the formula. More simply how do i know what contributes to the stress in x and the stress in y for a given problem.
 
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The first thing you should do is to draw a free body diagram of an element in the area you are interested in. The loads imposed will affect that FBD. That is what tells you what you need. Granted, there is a certain amount of practice and intuition involved as well.
 
It's called elasticity theory. Try reading a book.
 
Brian_C said:
It's called elasticity theory. Try reading a book.

Oh, come on, Brian. He has a legitimate question and your reply was a bit harsh.

To answer your question, there are several steps you'll need to go through. Send me private message with your email address and I'll send you a .pdf of a good example. Good luck!
 

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