In this paper, the simulation of the piercing process is performed by the three-dimensional finite-element method in Dieschers mill. The material properties of steel 33Mn2V are introduced. The simulated results visualize dynamic evolution of temperature, especially inside the workpiece. Its show the distribution of temperature on the internal and external surface of the work-piece is non-uniform. The temperature of the internal surface is far higher than that of the external surface of workpiece.
Failure causes on a condensate pump shaft were discussed by means of macroscopic observation, chemical composition analysis, metallurgical microstructure inspection, mechanical property tests and stress analysis. The experimental results showed that the improper material with disqualified chemical composition, improper microstructure and poor mechanical properties acted as inherent factor. In addition, structure design that led to stress concentration contributed to the failure as external factor. Finally, fatigue fracture happened at the reduce section of the pump shaft.
Fracture failure analysis on device clamp screws of one 110kV transmission line has been carried out based on results of macro-observation, pre-tightening test, mechanical property examination, chemical composition analysis, microstructure observation, SEM observation and EDAX analysis. It is concluded that the main reason of the screw fracture lies in misuse material and improper heat processing which led to material degradation. Suggestions are put forward finally.
Photogrammetric calibration methods for digital CCD cameras are usually capable of acquiring explicit distortion parameters. However, it would cause the correcting results to be less accurate due to irregular array with explicit image correction method. In order to produce images with less distortion, an implicit model was proposed in this paper. Moreover, the model was applied to correct images from a non-metric camera. The real tests with images indicate the improvement is more obvious in eliminating distortion on images.
The cause of welding cracks in thermal sprayed water wall tubes was analyzed, the choice of nondestructive testing method was discussed, and a welding procedure for the water wall tube with thermal sprayed coatings was established successfully.
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