# Lug FBD and simple mechanicals

• Boolean
In summary, a Lug FBD is a simplified representation of a mechanical system that only shows the forces acting on the system without showing any physical components. It is used in engineering and physics to analyze and understand the forces in a system. This is different from a traditional free body diagram, which includes both physical components and forces. Lug FBDs are commonly used in mechanical engineering, structural analysis, and design processes. To create a Lug FBD, all the forces and their directions must be identified and labeled on a simplified diagram. However, Lug FBDs have limitations such as not showing moments or torques and being simplified representations that may not accurately reflect real-world systems.
Boolean
TL;DR Summary
Having trouble with some mechanics hand calcs
Pretty simple FBD of a lug in a pull test that I solved using FEA software, but I’m having trouble checking with a hand calc.
Back end is fully supported in a test fixture
Feel free to make up numbers where not given

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Hello @Boolean , !

Boolean said:
that I solved using FEA
What came out ? With what dimension ?

## 1. What is a Lug FBD?

A Lug FBD, or Free Body Diagram, is a visual representation of all the forces acting on a lug or a small mechanical part. It is used to analyze the forces and determine the equilibrium or motion of the part.

## 2. How is a Lug FBD different from a regular FBD?

A Lug FBD is specifically used for small mechanical parts like lugs, while a regular FBD can be used for any object or system. A Lug FBD also includes the forces acting on the lug from its surroundings, such as contact forces, while a regular FBD only considers external forces.

## 3. What are the benefits of using a Lug FBD?

Using a Lug FBD allows for a clear and organized analysis of the forces acting on a lug, which can help in designing and optimizing the part for its intended use. It also helps in identifying any potential weak points or stress concentrations in the lug.

## 4. What are simple mechanicals?

Simple mechanicals refer to mechanical systems or components that are composed of basic elements, such as gears, levers, and pulleys, and can be analyzed using simple mathematical equations. They are often used in introductory engineering courses to demonstrate fundamental principles.

## 5. How are simple mechanicals useful in real-world applications?

Simple mechanicals may seem basic, but they are the building blocks of more complex machines and systems. Understanding their principles and behavior can help in designing and troubleshooting more advanced mechanical systems, such as engines, robots, and industrial machinery.

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