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单轴向与多轴向随机载荷下星载单机的疲劳损伤研究
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作者 张雨 董好志 任海林 《机械制造与自动化》 2023年第2期68-71,共4页
基于随机振动频域理论,采用“3σ法则”和等效应力-应变的疲劳分析方法,对比研究单轴、多轴载荷下某星载单机的疲劳损伤,评估两种试验方案的等效性。结果表明:该单机对z向激励敏感,z向随机载荷造成的疲劳损伤远大于x、y向载荷;多轴向随... 基于随机振动频域理论,采用“3σ法则”和等效应力-应变的疲劳分析方法,对比研究单轴、多轴载荷下某星载单机的疲劳损伤,评估两种试验方案的等效性。结果表明:该单机对z向激励敏感,z向随机载荷造成的疲劳损伤远大于x、y向载荷;多轴向随机载荷作用下单机的最大等效应力、疲劳损伤累积均大于单轴向随机载荷作用;3个正交轴下的单轴依次振动替代多轴随机振动试验的等效方案为欠试验方案,需要从定量角度优化试验方案。 展开更多
关键词 星载 随机振动 单、多轴向载荷 疲劳损伤累积
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A comparative crashworthiness analysis of multi-cell polygonal tubes under axial and oblique loads
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作者 邹翔 高广军 +3 位作者 张洁 周细赛 陈威 关维元 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第9期2198-2208,共11页
In order to investigate the energy absorption characteristics of multi-cell polygonal tubes with different cross-sectional configurations,firstly,the theoretical formulae of the mean crushing force under axial load fo... In order to investigate the energy absorption characteristics of multi-cell polygonal tubes with different cross-sectional configurations,firstly,the theoretical formulae of the mean crushing force under axial load for four multi-cell polygonal tubes were derived by combining the Super Folding Element theory with Zhang’s research results.These formulae can be used to validate the numerical model and quickly evaluate the energy absorption ability of multi-cell polygonal tubes.Furthermore,a comparative study on the energy absorption performance of eight multi-cell polygonal tubes under axial and oblique loads was conducted.The results show that all tubes have a stable mixed deformation mode under axial load.The multi-cell decagon tube has better energy-absorption ability compared with other tubes.Whenθis less than 10°,all the tubes maintain a stable deformation mode,and the multi-cell decagon tube also has the biggest crushing force efficiency and specific energy absorption among these eight tubes;meanwhile compared with the results atθ=0°,the specific energy absorption of all tubes decreases by about 8%-21%,while the crushing force efficiency increases by 20%-56%.However,at large angles 20°and 30°,all of the tubes collapse in bending modes and lose their effectiveness at energy absorption. 展开更多
关键词 multi-cell polygonal tubes thin-walled structure axial load oblique load energy absorption mean crushing force
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The effects of Haversian fluid pressure and harmonic axial loading on the poroelastic behaviors of a single osteon 被引量:7
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作者 WU XiaoGang CHEN WeiYi GAO ZhiPeng GUO HongMei WANG LiLi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第9期1646-1656,共11页
In order to well understand the mechanism of the mechanotransduction in bone, we propose a new model of transverse iso- tropic and poroelastic osteon cylinder considering Haversian fluid pressure. The analytical pore ... In order to well understand the mechanism of the mechanotransduction in bone, we propose a new model of transverse iso- tropic and poroelastic osteon cylinder considering Haversian fluid pressure. The analytical pore pressure and velocity solutions are obtained to examine the fluid transport behavior and pressure distribution in a loaded osteon on two different exterior sur- face cases. Case I is stress free and fully permeable and case I1 is impermeable. The following are the results obtained. (i) The Haversian fluid may not be ignored because it can enlarge the whole osteonal fluid pressure field, and it bears the external loads together with the solid skeleton. (ii) The increase of both axial strain amplitude and frequency can result in the increase of fluid pressure and velocity amplitudes, while in case II, the frequency has little effect on the fluid pressure amplitude. (iii) Under the same loading conditions, the pressure amplitude in case II is larger than that in case I, while the velocity amplitude is smaller than that in case I. This model permits the linking of the external loads to the osteonal fluid pressure and velocity, which may be a stimulus to the mechanotransduction of bone remodeling signals. 展开更多
关键词 OSTEON poroelasticity transverse isotropic bone fluid flow intraosseous pressure
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