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+--- Thread: Finding the Young's Modulues in a curve stress strain (/thread-13852.html)
Finding the Young's Modulues in a curve stress strain - AicramM - Nov-03-2018
Hello !
I am working on my scrip, I import some date and I plot a curve stress x strain, I have to get the Young's Modulus, the Limit of Elasticity and the Stress at 0,2% of plastic deformation. Does anyone know how can I get the young's modulus ?
I did the following for importing my data and plotting it:
import numpy as np
import math
import matplotlib.pyplot as plt
import os.path
def founction_chemin ():
print ("\nEntrez le chemin des données expérimentales de l'essai de traction:\n")
chemin_entre=[]
chemin_entre=input()
return chemin_entre
def Variables():
variable = []
variable=input()
return (float(variable))
#déclaration des variables
chemin= founction_chemin()
data_from_file = np.loadtxt(chemin)
print ("\nEntrez le rayon en mm")
rayon = Variables ()
surface= (((rayon)*10.**(-3.))**2)*math.pi
print ("\nEntrez la longuer en mm")
longueur = Variables()
deformations = ((data_from_file[:,1])/longueur)*100 #100%
contraintes = ((data_from_file[:,2])/surface)
#paramètres matériaux
#contrainte maximale
contrainte_maximale = contraintes.max()
plt.plot(deformations, contraintes)
plt.title("Courbe contrainte x déformation")
plt.xlabel('Déformation (%)')
plt.ylabel('Contrainte (Pa)')PS: variables and descriptions are in FrenchThank you very much !
RE: Finding the Young's Modulues in a curve stress strain - Gribouillis - Nov-03-2018
According to wikipedia, Young's modulus is the stress divided by the strain, or in french the "contrainte" divided by the "déformation". As you are plotting the stress versus the strain, I think it shouldn't be too difficult.