# Calculate Maximum Bending Moments & Stress

• Stretch69
In summary, the conversation discusses calculating the maximum bending moments and maximum stress for a see-saw design. The person asking for help needs to show their attempt at solving the problem and asks for assistance in finding the weight of the beam that can withstand the maximum stress.
Stretch69
Can anyone help me calculate the maximum bending moments and maximum stress for the figure i uploaded please.

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• tallman pic.jpg
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If you want us to help us, you need to show us what you have done to attempt the question.
Because you haven't done that, I'll just ask a question.

Where will the maximum bending moment and therefore maximum stress occur on the see-saw?

At the spring, i need to find out the max bending moment and stress, so i will know how to find the weight of the beam i need to use in my design that can withstand that maximum stress, can u help me please?

## 1. What is the formula for calculating maximum bending moments?

The formula for calculating maximum bending moments is M = WL/4, where M is the maximum bending moment, W is the load applied to the beam, and L is the length of the beam.

## 2. How do I determine the maximum stress in a beam?

The maximum stress in a beam can be determined by using the formula σ = Mc/I, where σ is the maximum stress, M is the maximum bending moment, c is the distance from the neutral axis to the outermost point of the beam, and I is the moment of inertia of the beam.

## 3. What are the units for maximum bending moments and stress?

The units for maximum bending moments are pound-force per inch (lb-in) or Newton-meters (N-m). The units for maximum stress are pounds per square inch (psi) or Newtons per square meter (N/m^2).

## 4. How does the type of load affect the maximum bending moments and stress?

The type of load applied to a beam, such as point load or distributed load, will affect the magnitude and location of the maximum bending moments and stress. For example, a point load will result in a larger maximum bending moment and stress at the point of application, while a distributed load will result in a more evenly distributed maximum bending moment and stress along the length of the beam.

## 5. What factors can cause the maximum bending moments and stress to exceed the safe limit for a beam?

The maximum bending moments and stress can exceed the safe limit for a beam if the beam is subjected to a load that is too heavy or if the beam is not structurally sound. Other factors that can contribute to excessive bending moments and stress include improper beam design, material defects, and external factors such as wind or earthquake forces.

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