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CJ 88-25. A numerical method for simulating the pressure forming of visco-plastic sheet metal under plane strain conditions
964
Chinese abstracts
CJ 88-24. The effects of temperature and creep damage on creep crack growth in HK40 steel. By ZHU SHIJIE,LI PEIEN,Yu YONGSI,ZHANGJANSHANand CAO ZHIBEN(Dalian Institute of Technology, Dalian, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 59-64. By measuring the creep crack growth rate in specimens of HK40 steel at temperatures of 1103-1163 K, the influence of temperature on the creep crack growth rate is analysed. The activation energy for the creep crack growth calculated from these data is close to the activation creep energy, and this implies that a creep mechanism may control the crack growth rate. The creep crack growth behavior of a cast specimen differs from that of the two kinds of creep-damaged specimen. The larger area fraction of cavities results in higher creep growth rates, while the fine secondary carbide makes the crack growth rate increase. CJ 88-25. A numerical method for simulating the pressure forming of visco-plastic sheet metal under plane strain conditions. By Luo ZIJIANand Guo NAICHENG(Northwestern Polytechnical University, Xi'an, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 65-73. A numerical method for simulating the pressure forming of visco-plastic sheet metal under plane strain conditions based on the authors' previous work and related literature is presented. The proposed method is able not only to simulate the processes under constant pressure, but also to determine the optimal loading pattern in order to keep the strain rate approximately unchanged during the processes. The results obtained by applying the proposed method to some processes are consistent with the data found in the literature, and may serve as a guide in drawing up the parameters for the relevant processes. CJ 88-26. Kinematic influence coefficient method for dynamic force analysis on complex multi-loop spatial mechanisms. By HUANGZHENand WANGHONGBO(Yanshan University, Beijing, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 74-81. CJ 88-27. Optimum design of linkages for the working device of loaders. By YANGCENKANG and ZHANGTIEZHU(Jilin University of Technology, Changchun, China). Chinese d. Mech. Engng 24, No. 3 (Sept. 1988), pp. 81-89. The mathematical model for the optimum design of the joint positions in the convertible linkages of the working device of loaders is discussed, and two optimum programmes are briefly introduced. The method and programmes have been used in nine types of loader, showing their soundness and effectiveness. CJ 88-28. A new method in profile modelling. By ZHANGKECUN(Xi'an Jiaotong University, Xi'an, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 90-96. Problems in calculating functional extrema, as examplified in the design of mechanical parts, the design of the shape of antennae and the analysis of various measured data, are described, and an efficient numerical method for solving this kind of problem is proposed. Excellent results are obtained in applying the method to both profile modelling and properties analysis of an assortment of mechanical parts. The method can also be conveniently applied to various examples of curve-fitting. CJ 88-29. Probabilistic analysis and Monte Carlo simulation of the kinematic errors in spatial linkages. By Xu WEILIANGand ZHANGQIXIAN(Beijing Institute of Aeronautics and Astronautics, Beijing, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 97-104.
Chinese abstracts
CJ 88-24. The effects of temperature and creep damage on creep crack growth in HK40 steel. By ZHU SHIJIE,LI PEIEN,Yu YONGSI,ZHANGJANSHANand CAO ZHIBEN(Dalian Institute of Technology, Dalian, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 59-64. By measuring the creep crack growth rate in specimens of HK40 steel at temperatures of 1103-1163 K, the influence of temperature on the creep crack growth rate is analysed. The activation energy for the creep crack growth calculated from these data is close to the activation creep energy, and this implies that a creep mechanism may control the crack growth rate. The creep crack growth behavior of a cast specimen differs from that of the two kinds of creep-damaged specimen. The larger area fraction of cavities results in higher creep growth rates, while the fine secondary carbide makes the crack growth rate increase. CJ 88-25. A numerical method for simulating the pressure forming of visco-plastic sheet metal under plane strain conditions. By Luo ZIJIANand Guo NAICHENG(Northwestern Polytechnical University, Xi'an, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 65-73. A numerical method for simulating the pressure forming of visco-plastic sheet metal under plane strain conditions based on the authors' previous work and related literature is presented. The proposed method is able not only to simulate the processes under constant pressure, but also to determine the optimal loading pattern in order to keep the strain rate approximately unchanged during the processes. The results obtained by applying the proposed method to some processes are consistent with the data found in the literature, and may serve as a guide in drawing up the parameters for the relevant processes. CJ 88-26. Kinematic influence coefficient method for dynamic force analysis on complex multi-loop spatial mechanisms. By HUANGZHENand WANGHONGBO(Yanshan University, Beijing, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 74-81. CJ 88-27. Optimum design of linkages for the working device of loaders. By YANGCENKANG and ZHANGTIEZHU(Jilin University of Technology, Changchun, China). Chinese d. Mech. Engng 24, No. 3 (Sept. 1988), pp. 81-89. The mathematical model for the optimum design of the joint positions in the convertible linkages of the working device of loaders is discussed, and two optimum programmes are briefly introduced. The method and programmes have been used in nine types of loader, showing their soundness and effectiveness. CJ 88-28. A new method in profile modelling. By ZHANGKECUN(Xi'an Jiaotong University, Xi'an, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 90-96. Problems in calculating functional extrema, as examplified in the design of mechanical parts, the design of the shape of antennae and the analysis of various measured data, are described, and an efficient numerical method for solving this kind of problem is proposed. Excellent results are obtained in applying the method to both profile modelling and properties analysis of an assortment of mechanical parts. The method can also be conveniently applied to various examples of curve-fitting. CJ 88-29. Probabilistic analysis and Monte Carlo simulation of the kinematic errors in spatial linkages. By Xu WEILIANGand ZHANGQIXIAN(Beijing Institute of Aeronautics and Astronautics, Beijing, China). Chinese J. Mech. Engng 24, No. 3 (Sept. 1988), pp. 97-104.