extrudion 2.1.3

Analyzes TRA files for stress and strain

Python Package to extract information about the Stress, Strain and Young Modulus from a set of .TRA files

Set up Instructions

Run the following command in the conda/miniconda terminal to install the package: pip install extrudion

Import the package in your Jupyter project or Python script: import extrudion as ex

Available commands:

Analyze a whole directory ex.analyzeDirectory(folder_path, cut_off = True, sample_thickness = 10) plots all the .TRA files in the given directory.

returns a pandas DataFrame containing

Arguments:

• folder_path can be left empty to analyze the current working directory (e.g. ex.analyzeDirectory() )

• folder_path can be a relative path to a folder within the current working directory (e.g. ex.analyzeDirectory('data') )

• folder_path can be the absolute path (e.g. ex.analyzeDirectory('C:\Users\Desktop\extrusion_data') )

• cut_off is by default True and must not be specified. If it is true, cuts the data at the max value of Stress

• sample_thickeness is the value in mm of the size of the sample. The surface of the sample is sample_thickeness * 10 converted in meters squared. If not specified, a value of 10 mm is assumed.

The results are saved in analysis.csv file in the same directory.

Analyze a single file ex.analyzeFile(*file_path*, folder=[], cut_off = True, sample_thickeness = 10)

analyzeFile, analyzes a single file and returns the pandas.Dataframe with the results as shown below. -folder must be specified as a second argument -cut_off and sample_thickness can be specified as a third argument as shown above.

Mathematical Formulas

Stress = Force['N'] / sample_thickness / 10 * 10^3

returns gives the stress in kPa

Strain = ln( length['mm'] / initial length ['mm'] )

Young Modulus = slope of the best line fit for the curve

Intercept = the incercet of the previous fit

Yield Stress and Strain are the point of intersection for the Young modulus line shifted by 0.02 in the Strain and the data.

Example