The image above represents risk of rupture. To calculate risk of rupture, four essential parameters are needed and these parameters are Applied Stress (σ), Stress below Zero Probability of Failure (σu), Characteristic Strength (σo) and Weibull Modulus (m).
The formula for calculating risk of rupture:
R = (σ – σu / σo)m
Where:
R = Risk of Rupture
σ = Applied Stress
σu = Stress below Zero Probability of Failure
And also, σo = Characteristic Strength
m = Weibull Modulus
Let’s solve an example;
Find the risk of rupture when the applied stress is 14, the stress below zero proability of failure is 7, the characteristic strength is 18 and the weibull modulus is 2.
This implies that;
σ = Applied Stress = 14
σu = Stress below Zero Probability of Failure = 7
And then, σo = Characteristic Strength = 18
m = Weibull Modulus = 2
R = (σ – σu / σo)m
R = (14 – 7 / 18)2
That is, R = (7 / 18)2
R = (0.388)2
R = 0.151
Therefore, the risk of rupture is 0.151.
Read more:Â How to Calculate and Solve for Surface Roughness Parameter I Polymer Deformation
How to Calculate the Risk of Rupture With Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the risk of rupture.
To get the answer and workings of the risk of rupture using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.
You can get this app via any of these means:
Web – https://www.nickzom.org/calculator-plus
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To get access to the professional version via web, you need to register and subscribe to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator
Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.
Now, Click on Polymer Deformation under Materials and Metallurgical
Now, Click on Risk of Rupture under Polymer Deformation
The screenshot below displays the page or activity to enter your values, to get the answer for the risk of rupture according to the respective parameter which is the Applied Stress (σ), Stress below Zero Probability of Failure (σu), Characteristic Strength (σo) and Weibull Modulus (m).
Now, enter the values appropriately and accordingly for the parameters as required by the Applied Stress (σ) is 14, Stress below Zero Probability of Failure (σu) is 7, Characteristic Strength (σo) is 18 and Weibull Modulus (m) is 2.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the risk of rupture and presents the formula, workings and steps too.
