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Xiong Y.,Zhejiang University of Technology | Xiong Y.,Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Processing Technology
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2010

Determination of the opening/closure load (P op or P cl) by traditional ASTM2% offset method and unloading compliance method depends on the linear sections of compliance curve, but errors often occur caused by manual operation. This paper focuses on the physical meaning of compliance changes caused by plastic deformation at the crack tip, and the relationship among compliance change, crack opening/closure and elastic-plastic behavior in a load cycle is analyzed. The fatigue test is carried out for structural steel by high-precision local measurement technique, hysteresis loops accurately denoting the elastic-plastic behavior near the crack tip are obtained, and the load at loop's inflexions is calculated by differential method. Several crack driving force parameters taken from literatures are evaluated based on the test result. It is indicated that ΔK RPG(=K max-K RPG) is more suitable to be a parameter of driving force for crack growth than ΔK cl(=K max-K cl) and ΔK op(=K max-K op). Source


Lu Z.-M.,Zhejiang University of Technology | Lu Z.-M.,Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Processing Technology | Shi L.-M.,Zhejiang University of Technology | Zhu S.-J.,Zhejiang University of Technology | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

The 304 stainless steel specimens were treated by shot-peening(SP)and laser-peening (LP) respectively. The grain size and metallographic organization of the specimen surface layer was tested with the X-ray diffraction method, and the stress corrosion sensitivity was analyzed use the slow strain rate tests(SSRT). The results show that surface layer grains of the specimen are obviously refined after being treated by LP, but no significant martensitic transformation is found, with the increase of LP energy density, the stress corrosion sensitivity decreases gradully; While both the grain refinement and significant martensitic transformation are found at the surface of the specimen treated by SP, with the increase of SP pressures, the stress corrosion sensitivity decreases at first, and then increases. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved. Source


Yao J.,Zhejiang University of Technology | Yao J.,Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Processing Technology | Kovalenko V.,Kharkiv Polytechnic Institute | Zhang Q.,Zhejiang University of Technology | And 2 more authors.
4th Pacific International Conference on Applications of Lasers and Optics, PICALO 2010 | Year: 2010

The choice of proper working conditions is a problem for any processing. But for laser processing this procedure is much more serious. The final results of the processing are usually influenced by more than 100 factors. So the best way to choose the working conditions more cheaply and fast is to use the processing simulation. Different tactics of this procedure is discussed and the statistical modelling is accepted. The actual model for laser cladding is developed based on the experimental results of 2Cr13 stainless steel cladding with diode laser robotized system. This model is optimized and verified by experimental results, and then is used to find the optimal processing parameters for laser remanufacturing on 2Cr13 turbine blade. In the light of the lost sizes and required property, this statistical model contributes to repair the failed turbine blade by diode laser robotized system with high efficiency. Source


Liu Y.,Zhejiang University of Technology | Liu Y.,Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Processing Technology | Zhu H.,Zhejiang University | Dong X.,Zhejiang University of Technology | And 3 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

In maxillofacial surgery, surgical plan and simulation are rarely lacked before clinical operation, and experiences of surgeon are relied heavily. Aiming at this problem, digital design and manufacturing techniques such as image processing, three dimensional tissue reconstruction, surgical aid tool design and rapid prototyping manufacturing were applied into medical areas, to construct surgical plan design system for complicated maxillofacial surgery. With this system, surgical plan design based on virtual model and model operation simulation based on physical model can be realized, and ideal surgical treatment strategy can be acquired, and this strategy can be operated accurately in clinic with help of surgical aid tools. Total 22 successful clinical applications illustrate that, with sugary plan design system based on digital design and manufacturing techniques, the efficiency and quality of maxillofacial surgery can be improved effectively. Source


Yao J.,Key Laboratory of Special Purpose Equipment and Advanced Processing Technology | Yao J.,Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Processing Technology | Yao J.,Zhejiang University of Technology | Zhang Q.,Key Laboratory of Special Purpose Equipment and Advanced Processing Technology | And 8 more authors.
Physics Procedia | Year: 2010

Different laser surface hardening techniques, such as laser alloying and laser solution strengthening were adopted to perform modification treatment on the local region of inset edge for 2Cr13 and 17-4PH steam turbine blades to prolong the life of the blades. The microstructures, microhardness and anti-cavitation properties were investigated on the blades after laser treatment. The hardening mechanism and technique adaptability were researched. Large scale installation practices confirmed that the laser surface modification techniques are safe and reliable, which can improve the properties of blades greatly with advantages of high automation, high quality, little distortion and simple procedure. Source

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