TRUSS STRUCTURE. Using python to develop a Finite element method(FEM) program

# Truss FEM Program

## Prerequisites

Before running the program, ensure you have the following dependencies installed:

- Python 3.8 or higher
- tkinter
- numpy
- sympy
- PIL (Pillow)
- tabulate

You can install the required packages using pip:

## Usage Instructions

1. **Run the Program**:

2. **Input Parameters**:
- Enter the element-node connectivity in the "Element node Connectivity" text box.
- Use the "Update" button to update the frames then start with the input data.
After finishing the input, you can skip step 3, and go to step 5 through 9.

3. **Load Examples**:
- Select an example from the dropdown menu and click "Load Example" to populate the input fields with predefined data. If you want to get some input instructions instead of directly inputting many parameters, you can use the plug-in examples to test the program.

4. **Material Properties**:
- Choose a material from the dropdown menu and click "Load Material" to apply its properties to the elements.

5. **Calculate Properties**:
- Click "Calculate Element Properties" to compute the length and orientation of elements and their stiffness matrices.

6. **Assemble Global Stiffness**:
- Click "Assemble Global Stiffness" to assemble the global stiffness matrix from the element stiffness matrices.

7. **Solve Unknowns**:
- Click "Solve Unknowns" to solve the system of equations for unknown displacements and forces.

8. **Calculate Stress & Strain**:
- Click "Calculate Stress & Strain" to compute the strain and stress for each element.

9. **View Results**:
- The results will be displayed in the respective text boxes for element stiffness, global stiffness, calculation results, and strain & stress.

Follow these steps to effectively use the Truss FEM Program for analyzing truss structures.