Method for predicating high-strength steel fatigue crack growth performance
A fatigue crack propagation, high-strength steel technology, applied in the direction of strength characteristics, using stable tension/pressure testing material strength, measuring devices, etc., can solve complex and time-consuming problems, save time and cost, save experimental time and cost, resolving effects of unclear physical meaning
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Embodiment 1
[0061] In this embodiment, static mechanical properties are used to predict the fatigue crack growth performance of two kinds of AISI 4340 steels. The specific steps are as follows:
[0062] Step 1: Perform a tensile test to obtain the tensile strength σ of the material b ;
[0063] Step 2: Carry out the plane strain fracture toughness experiment to obtain the fracture toughness K IC ;
[0064] Step 3: Through the formula (1), the value range of ΔK is 10MPa√m-0.9K IC , to calculate the fatigue crack growth rate, the estimated value and the experimental value are shown in Figure (5), and the two coincide.
Embodiment 2
[0066] In this embodiment, static mechanical properties are used to predict the fatigue crack growth properties of two steels used in the nuclear industry. The specific steps are as follows:
[0067] Step 1: Perform a tensile test to obtain the tensile strength σ of the material b ;
[0068] Step 2: Carry out the plane strain fracture toughness experiment to obtain the fracture toughness K IC ;
[0069] Step 3: Through the formula (1), the value range of ΔK is 10MPa√m-0.9K IC , to calculate the fatigue crack growth rate, the estimated value and the experimental value are shown in Figure (6), and the two coincide.
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