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energy, crack propagation energy, impact absorbing energy, fracture time and deflection as well as the fracture morphologies at test temperature of -70℃ show that W films can improve the impact... for displacement measurement. The transfer time from the furnace to impact was measured equal to 1.85s. Then series of tests with instrumented specimens were performed at losses after 1.85s. Usually......
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> Abstract: Under impact load, using energy estimation and updated finite element method, the crack propagation of Mg-Li alloys was studied, and the relations between high speed impact, time interval and crack propagation velocity were deduced. The effects of impact pattern characteristic parameters such as impact range and time interval on impact fatigue crack growth and propagation rates were......
J. Cent. South Univ. Technol. (2011) 18: 1068-1073 DOI: 10.1007/s11771-011-0805-4 Degradation of chlorothalonil by ultrasonic irradiation: Kinetics and impact factors GUO Hong-guang(郭洪光), GAO Nai.... Key words: ultrasonic irradiation; chlorothalonil; kinetics; impact factors 1 Introduction Chlorothalonil(2, 4, 5, 6-tetrachloroisophthalonitrile, CLT) is a high-efficient non-systemic organ......
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meshing in idle condition of gearbox was established, and the influences of factors such as gear meshing clearance, time-varying meshing stiffness and drag torque generated by the driven gear rotation... the vehicle NVH performance. Key words: unit modeling method; quasi-transient engine model; time-varying mesh stiffness; torsional damper 汽车传动系是一个非常复杂的多自由度非线性系统,发动机输出扭矩的不平稳使传动系产生一系列的振动噪声问题,影响车辆NVH性能.此外,扭转振动还......
Effect of microstructure on impact toughness of TC21 alloy CHEN Jun(陈军)1, ZHAO Yong-qing(赵永庆)1, ZENG Wei-dong(曾卫东)2 1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China; 2...; Abstract: The impact toughness of TC21 alloy after different types of forging and heat treatments was studied. The results show that heat......
J. Cent. South Univ. Technol. (2011) 18: 2056-2060 DOI: 10.1007/s11771-011-0942-9 Guaranteed cost sampled-data control for uncertain nonlinear time-varying delay system FAN Li-ying(樊丽颖)1, 2, WU Jun...-varying delay. The parameter uncertainties are time-varying norm-bounded and appear in both the state and the input control matrices. By applying an input delay approach, the system was transformed......
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temperature-varying and time-varying characteristics. Predicted mean vote (PMV) model cannot correctly predict the thermal sensation under non-thermal equilibrium cold environment. The correlation between... aimed at the impact of air temperature and exposure time on human skin temperature and thermal sensation exposure to cold thermal environmental conditions. The experiment was conducted at four low......
