Testing the fatigue strength of motor shaft new energy automobile is an important part of ensuring the reliability and durability of motor shaft.
A common method is the rotary bending fatigue test. In this test, the motor shaft is mounted on a rotating device and subjected to a periodic bending load. The fatigue limit is determined by continuously increasing the load until the motor shaft breaks due to fatigue. During the test, the load size, frequency and rotation speed need to be precisely controlled, while monitoring parameters such as the strain and temperature of the shaft.
There is also an axial fatigue test. In this test, the motor shaft is subjected to periodic tensile and compressive loads along the axial direction. Through similar loading and monitoring methods, its fatigue performance under axial load is evaluated.
In addition, the finite element analysis (FEA) method can also be used for predictive testing. By establishing a three-dimensional model of the motor shaft, simulating its force conditions in actual work, analyzing the stress distribution and deformation, and evaluating the area where fatigue failure may occur. Then, the model is verified and corrected in combination with actual test data to improve the accuracy of the prediction.
In actual testing, strain gauges are usually used to measure the strain changes of the motor shaft during loading. These strain data can help determine the location of stress concentration and further analyze fatigue risks.
At the same time, advanced non-destructive testing technologies, such as ultrasonic testing and magnetic particle testing, will be used to detect whether there are internal cracks or defects without destroying the motor shaft. These defects may expand rapidly under fatigue loads and cause shaft failure.
In summary, the fatigue strength of motor shaft new energy automobile requires the comprehensive use of multiple test methods, monitoring methods and analysis techniques to comprehensively and accurately evaluate the fatigue performance of motor shafts and provide guarantees for the safe and reliable operation of new energy vehicles.
