How Do You Calculate Stress on a Piston Rod?

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SUMMARY

The calculation of stress on a piston rod is defined by the formula Stress = N (normal force) / Area. To determine the force acting on the piston rod, it is essential to sum the forces and moments around a specific point. Selecting an appropriate point simplifies the calculation process, allowing for accurate stress analysis in mechanical applications.

PREREQUISITES
  • Understanding of basic mechanics and forces
  • Familiarity with stress and strain concepts
  • Knowledge of mechanical components, specifically piston rods
  • Ability to perform calculations involving forces and moments
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  • Research methods for calculating forces on mechanical components
  • Learn about moment equilibrium in static systems
  • Explore advanced stress analysis techniques for piston rods
  • Study the impact of material properties on stress calculations
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Mechanical engineers, students studying mechanics, and professionals involved in the design and analysis of piston systems will benefit from this discussion.

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http://imgur.com/vheez.gif"


vheez.gif

Stress = N (normal force) / Area



I really need to know what force is acting on the piston rod.

TIA
 
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Can you sum the forces and moments around a point? What point could you select to make it easy?
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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