Multi-axial fatigue life prediction method based on weighted average maximum shear strain amplitude plane
A technology of fatigue life prediction and shear strain, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inability to apply, no suitable processing of multi-axis complex loads, etc., to achieve convenient and good fatigue determination methods Longevity and ease of engineering application
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[0042] The present invention is illustrated in conjunction with the accompanying drawings.
[0043] The present invention further illustrates the present invention through the fatigue test, and the test is divided into two parts, namely a uniaxial variable-amplitude load test and a multi-axial variable-amplitude load test. There are 4 kinds of verified materials, namely pure titanium, BT9 titanium alloy, 1050QT steel and 304L stainless steel.
[0044] A multiaxial fatigue life prediction method based on the weighted average maximum shear strain amplitude plane, such as figure 1 As shown, the specific calculation method is as follows:
[0045] Step 1): Synthesize the multi-axis variable amplitude load history through the von Mises equivalent strain formula, and the von Mises equivalent strain ε eq Calculated as follows:
[0046]
[0047] Among them, ε x ,ε y ,ε z ,γ xy ,γyz ,γ xz is the strain component in x, y, z, xy, yz, xz directions at any point in the multi-axia...
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