Hello guys, i need some help to solve this problem,

So our patner need to calculate torque ring (Delta Torque) inside casing 8-rounds as picture below,


we only have reference for the table but not for the equation to calculate value of torque ring / delta torque.




in this book, it is just explaining in common how to find delta force but not an exact equation for torque ring / delta torque


so maybe anyone here may help us because this is neccesary for our project
thanks before


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