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trapezoidal thread vs metric thread stress comparison

thread404-484747

trapezoidal thread vs metric thread stress comparison

trapezoidal thread vs metric thread stress comparison

(OP)
I want to compare stress on external thread for Tr75x4 vs M75x4 (in order to calculate fatigue life of thread)
please suggest me a proper wave to do this.
(if i am using tensile stress area method then for both thread i am getting same stress on external thread which is not true right ???)
so please just correct me and suggest proper method by which i can compare strength for both.

length of engagement= 70 mm
force on thread= 4,50,000 N

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