Micro-arc oxidation has become a focus of research on the surface of metal processing. But do not understand the load characteristics of the application of the micro-arc oxidation. In order to get the load characteristics of DC power supply which work in the process of micro-arc oxidation, a muti-waveform frequency sweeping power and DC voltage source series circuit is researched. This method uses the load frequency response can realize the online test load characteristics, load test result is good.
The temperature field distribution and thermal stress distribution in concrete has been studied by finite elements method to establish the relationship between the thermal stress and the temperature in this paper. The results show that the maximum thermal gradient and the maximum thermal stress in the concrete appears on the direction of greater structural dimension, and the thermal stress value is positively correlated with thermal gradient or saying temperature difference and elastic modulus, and is negatively correlated with the water content and air content.
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