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Liu P.F.,Zhejiang University | Xing L.J.,Zhejiang University | Liu Y.L.,Hangzhou Special Equipment Inspection Institute | Zheng J.Y.,Zhejiang University
Journal of Failure Analysis and Prevention | Year: 2014

As special equipment for material hoisting and carrying, the double-trolley overhead traveling crane develops rapidly in the field of mechanical engineering. In order to improve the safety, reliability, and economy, the lightweight design for the crane is crucial, which mainly contains two important fundamental works: one is the prediction of the limit load-bearing ability and the other one is the optimization. In this paper, a three-dimensional parametric finite element model is established and the limit load-bearing ability of the main girder of a true crane is predicted using the arc-length algorithm and nonlinear stabilization algorithm, respectively. Finite element analysis indicates the existing double-trolley overhead traveling crane shows a large strength allowance. The subsequent optimal design which aims to achieve a perfect match between the mechanical performance and weight is conducted based on the strength analysis. Specially, the software platform of optimal design for double-trolley overhead traveling crane is developed to reach the integrated parametric design interactively. The proposed numerical methods which are highlighted by an optimal design platform implement the lightweight design conception efficiently. By numerical analysis, this research is demonstrated to provide theoretical and technical support for promoting the lightweight design and safety evaluation of cranes. © 2013 ASM International. Source

Liu P.F.,Zhejiang University | Chu J.K.,Zhejiang University | Liu Y.L.,Zhejiang University | Liu Y.L.,Hangzhou Special Equipment Inspection Institute | Zheng J.Y.,Zhejiang University
Materials and Design | Year: 2012

The complex failure mechanisms that are commonly considered as the distinctive characteristic of composites are being amenable to nondestructive test advance. This research adopts the acoustic emission technique to study the failure mechanisms and damage evolution of carbon fiber/epoxy composite laminates. Effects of different lay-up patterns and hole sizes on the acoustic emission response are studied to set up the mapping between the failure properties and the acoustic signal features such as the energy, counting and amplitude. Moreover, the microscopic properties of different composite specimens after fracture are watched and analyzed by scanning electron microscope (SEM). Based on the mapping conception, the controlling microscopic failure mechanisms of composites including the splitting matrix cracking, fiber/matrix interface debonding, fiber pull-out and breakage as well as delamination are identified. It is expected the influence of complex lay-up patterns and sizes on the damage and failure properties of composites is represented by creating true mapping based on the acoustic emission technique. © 2011 Elsevier Ltd. Source

Zhao Y.,Zhejiang University | Liu G.,Zhejiang University | Liu Y.,Hangzhou Special Equipment Inspection Institute | Zheng J.,Zhejiang University | And 4 more authors.
International Journal of Hydrogen Energy | Year: 2012

There will be significant temperature rise within hydrogen vehicle cylinder during the fast filling process. The temperature rise should be controlled under the temperature limit (85 °C) of the structure material (set by ISO/TS 15869), because it may lead to the failure of the structure. In this paper, a 2-dimensional axisymmetric computational fluid dynamics (CFD) model for fast filling of 70 MPa hydrogen vehicle cylinder is presented. The numerical simulations are based on the modified standard k - ε turbulence model. In addition, both the equation of state for hydrogen gas and the thermodynamic properties are calculated by National Institute of Standards and Technology (NIST) database: REFPROP 7.0. The thermodynamic responses of fast filling with different pressure-rise patterns and filling times within type III cylinder have been analyzed in detail. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights. Source

Zhang D.,Zhejiang University of Technology | Sheng S.,Hangzhou Special Equipment Inspection Institute | Gao Z.,Zhejiang University of Technology
Advanced Materials Research | Year: 2012

Two important parameters of torispherical head that are R i(interior radius of spherical crown area) and r (interior radius of transition corner) have been optimized by the module of the large general-purpose finite-element software ANSYS, targeting the strength and stability of the head. This paper provides an optimized torispherical head, which improves the stability of the edge of the head with acceptable strength of the head. The procedure is generally applicable as a design tool for optimal design. © (2012) Trans Tech Publications, Switzerland. Source

Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipment Inspection Institute | Xiong X.F.,Zhejiang Bohua Environmental Technology and Engineering Co. | Fan Z.,Zhejiang University of Technology | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

The nanofiltration(NF) membrane technology presented in this paper were used to treat the industrial electroplating effluent for reutilization, which contained hazardous heavy metal ions such as chromium and zinc. Two different kinds of nanofiltration membranes were applied in pilot scale installation following the conventional wastewater treatment system. The effects of different operating parameters on their separation performance were investigated in detail. Results showed that both two NF membranes held large permeate flux under relatively low operating pressures. The rejection rates of the monovalent ions were less than 50%, while for divalent ions they were more than 90%, including SO4 2-, Ca2+, Cr3+ and Zn2+. Higher permeate flux, lower operating pressure and distinguished ion selectivity of nanofiltration membranes exhibited a big potential for industrial application concerning the investment and operation cost. © (2013) Trans Tech Publications, Switzerland. Source

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