The image above represents Goodman’s law. To calculate goodman’s law, three essential parameters are needed and these parameters are Fatique Limit (Ï„e), New Fatique Limit (Ï„m) and Tensile Strength of Alloy of Spring (TS).
The formula for calculating Goodman’s law:
Ï„ = Ï„e(1 –Â Ï„m/0.67TS)
Where:
Ï„ = Goodman’s Law (Ï„)
τe = Fatique Limit
Also, τm = New Fatique Limit
TS = Tensile Strength of Alloy of Spring
Let’s solve an example;
Find the goodman’s law when the fatique limit is 4, the new fatique limit is 10 and the tensile strength of alloy of spring is 12.
This implies that;
Ï„e = Fatique Limit = 4
Ï„m = New Fatique Limit = 10
and then, TS = Tensile Strength of Alloy of Spring = 12
Ï„ = Ï„e(1 –Â Ï„m/0.67TS)
So, Ï„ = 4(1 – 10/0.67(12))
Ï„ = 4(1 –Â 10/8.040)
Ï„ = 4(1 – 1.24)
That is, Ï„ = 4(-0.24)
Ï„ = -0.975
Therefore, the goodman’s law is -0.975.
Read more:Â How to Calculate and Solve for Deflection of Coil of Spring | Material Selection
How to Calculate Goodman’s Law Using Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the goodman’s law.
To get the answer and workings of the goodman’s law 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 for NGN 2,000 per annum 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 Material Selection under Materials and Metallurgical
Now, Click on Goodman’s Law under Material Selection
The screenshot below displays the page or activity to enter your values, to get the answer for the goodman’s law according to the respective parameters which are the Fatique Limit (Ï„e), New Fatique Limit (Ï„m) and Tensile Strength of Alloy of Spring (TS).
Now, enter the values appropriately and accordingly for the parameters as required by the Fatique Limit (τe) is 4, New Fatique Limit (τm) is 10 and Tensile Strength of Alloy of Spring (TS) is 12.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the goodman’s law and presents the formula, workings and steps too.
