A Strain-Controlled Tension-Torsion Thermomechanical Fatigue Test Method
A mechanical fatigue and strain control technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of casualties, economic losses, lack of systematic understanding, unfavorable equipment fatigue life and structure, etc., to reduce bench tests, reduce Resource and Time Cost Effects
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[0020] The present invention is illustrated in conjunction with the accompanying drawings.
[0021] The present invention is further illustrated by carrying out strain-controlled tensile-torsion thermomechanical fatigue tests on nickel-base superalloy GH4169.
[0022] A strain-controlled tensile-torsion thermomechanical fatigue test method is characterized in that: the realization steps of the method are as follows:
[0023] Step (1): Under zero mechanical loading, measure the axial thermal strain ε th The free expansion of , and fitting it as a function of sample temperature T to compensate for thermal strain, the function of sample temperature T is as follows:
[0024] ε th =E 0 +E 1 T+E 2 T 2
[0025] Among them, ε th is the axial thermal strain, T is the sample temperature, E 0 ,E 1 ,E 2 is the material constant;
[0026] For GH4169, the fitted material parameters are: E 0 =-1.195×10 -3 ,E 1 =1.551×10 -5 ,E 2 =6.624×10 -10 ;
[0027] Step (2): Set loadin...
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