What Is the Normal Stress in a Prismatic Bar Under Tension?

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Homework Help Overview

The problem involves calculating the normal stress in a prismatic bar subjected to a tensile load. The original poster provides specific values for the applied force and cross-sectional area, seeking to determine the normal stress in kilopascals (kPa).

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate stress using the formula stress = force / area, initially without unit conversion and later converting to appropriate units. Some participants question the derived units of a Pascal and the implications of the bar's support conditions on the force applied.

Discussion Status

The discussion is ongoing, with participants exploring unit conversions and the correctness of the force applied based on the bar's support. There is no explicit consensus on the correct approach or outcome yet.

Contextual Notes

Participants are discussing the importance of unit conversion and the assumptions regarding the bar's support, which may affect the force calculation.

Baumer8993
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Homework Statement


In a prismatic bar (same cross sectional area throughout the entire length), the load applied to both ends is 100 N causing the member to be in tension. If the cross sectional area of the member is
5 cm2. What is the normal stress in the in kPa?


Homework Equations


stress = force / area


The Attempt at a Solution



I first tried without looking at the units, and got 20, which is wrong. I next tried converting everything to m2 to get the answer is pascals the convert to kPa. I got 200 for my second answer. What am I doing wrong? This seems like such a simple problem!
 
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What are the derived units of a Pascal? Are they N/m^2 or N/cm^2?
 
They are N/m^2. I used an online converter to check, so I confused about what I did wrong.
 
Is the bar supported in the middle? If so, should the force be 100 or 200 N?
How did you get 20?
 

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