It is vital to obtain dynamic stress equilibrium and a nearly constant strain rate over most of the test duration.
大直径分离式霍普金森压杆(SHPB)试验装置被越来越多地应用于混凝土等脆性材料的高应变率力学性能研究,试件在破坏前,满足应力均匀分布要求,且保持恒应变率加载,是保证SHPB试验有效性及试验结果可靠性的关键。
The contratest results shows that for the brittle and low mechanical impedance materials,conventional SHPB experiment does not meet the precondition that the samples loaded dynamically with a SHPB apparatusshould be in dynamic stress equilibrium over the test duration, therefore, the experiment is invalid.
实验采用了两种不同的加载技术及应变监测方法,结果表明:采用传统SHPB技术无法有效测量炸药类脆性材料的动态变形行为;通过采用波形整形技术控制加载波形,可以使试样在变形过程中较好地满足应力均匀性条件并改善应变率恒定性状况;通过采用在试样上直接贴片监测应变的方法,可以较准确的测得试样的应变。
An improved method for obtaining dynamic stress equilibrium and nearly constant strain rate loading was proposed,containing pulse shaper design,nearly constant strain rate estimation,the optimum average strain rate determination and dynamic stress equilibrium analysis.
采用直径100 mm分离式霍普金森压杆(SHPB)试验装置,以碳纤维混凝土(CFRC)的SHPB试验为例,就试验过程中的波形整形技术展开研究,内容包括:波形整形器的设计、近似恒应变率的估算、最佳近似恒应变率的确定以及应力均匀性分析。
Characteristics of Listric Normal Fault Zone's Displacement and Stress Field in the Inhomogeneous Stress Field
非均匀应力场下的铲状正断层带位移场和应力场特征
2) the effect of uniform slip of faults on the stress field;
2)断层均匀滑动对区域应力场的影响;
Settlement and Stress Analysis of Stilling Basin on Non-homogeneous Foundation;
不均匀地基上消力池的变形与应力分析
Double Media Seepage-Stress Coupling Model for Heterogeneous Coal and Rock
非均匀煤岩双重介质渗流-应力耦合模型
Research on Heterogeneity of the Present Tectonic Stress Field at the Overland Part of the Zhangjiakou-Bohai Fault Zone
张渤带陆地段现代构造应力场的非均匀特征
Numerical Viscoelastic Simulation of Wellbore Shrinkage in Non-uniform In-situ Stress
非均匀地应力场中井眼缩径的粘弹性数值模拟
Mechanics Analysis of Casing Deformation Under Non-uniform In-situ Stress and Its Repair
非均匀地应力下套管变形和整形复位分析
Study of Double Frequency Laser Measuring Technology of Stress Homogeneity of Optical Material
双频激光测量光学材料应力均匀性技术研究
RESEARCH ON STRESS OF SLOTTED PIPE UNDER UNIFORM DISTRIBUTION LOADING
均匀载荷作用下割缝筛管的应力分析研究
Application of Uniform Design Method to Mechanical Performance Test of 304H Steel
均匀设计方法在304H钢力学性能试验中的应用
The relation of ??to the average value of ??may be assumed to lie between the aforementioned relations for uniform plane stress and uniform plane strain.
而?潞往闷骄?值的关系式可以认为处于上述的均匀平面应力和均匀平面应变的两个关系式之间。
To help maintain uniform tension in the filling yarns
有助于纬纱张力的均匀。
heterogeneous thermoelectric effect
非均匀温度差电效应
enriched uranium aqueous homogeneous reactor
浓缩铀水均匀反应堆
enriched uranium solid homogeneous reactor
浓缩铀固体均匀反应堆
semi homogeneous gas cooled breeder
半均匀气冷增殖反应堆
solid fuel heterogeneous reactor
固体燃料非均匀反应堆
Dynamic response of initially stressed moderately thick rectangular plates on non-homogenous elastic foundations
非均匀弹性地基上预应力中厚矩形板的动力响应