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1)  stress(strain) uniformity
应力(应变)均匀性
2)  uniformly varying stress
均匀变应力
3)  stress uniformity
应力均匀性
1.
Analysis on stress uniformity of viscoelastic materials in split Hopkinson bar tests;
SHPB试验中粘弹性材料的应力均匀性分析
2.
Axial stress uniformity in specimens of SHPB tests;
SHPB试验中试件的轴向应力均匀性
3.
According to the model of the pulse load produced by split Hopkinson pressure bar(SHPB) mechanism,the stress-strain curves were obtained by using ANSYS/LSDYNA finite element method,and the effect of the friction of the interface between the pressure bar and specimen and slenderness ratio of specimen on stress uniformity in specimen were discussed.
根据Hopkinson压杆试验装置产生压缩加载脉冲的力学模型,利用ANSYS/LSDYNA有限元显示动力学程序计算得到了试件在加载过程中的应力-应变曲线,并且和输入材料曲线做了比较,讨论了试件的长径比及试件与压杆之间的界面摩擦力对试件内部应力均匀性和对试件材料动态屈服应力的影响。
4)  iso-strain
均匀应变
1.
Based on the iso-strain and interfacial continuities conditions,a theoretical method is proposed to predict the elastic properties of triaxially braided composites concerning the variation of the braid yarn\'s undulation period along its transverse direction in particular areas.
基于均匀应变假设和界面连续性条件,并考虑到编织向纤维束波动周期在特定区域沿着自身横向的渐变,建立了一种分析三向编织复合材料弹性性能的理论预测方法。
5)  uniform stresses
均匀应力
6)  stress equilibrium
应力均匀
1.
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。
2.
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。
3.
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。
补充资料:动态应力-应变曲线
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性质: 在具有强迫正弦振荡的动态试验中,让黏弹性体作稳定振动,以力对变形作图,在十个周期中的轨迹为一封闭曲线,称之为动态应力-应变曲线。动态试验的结果取决于试验条件:试样形状、形变方式、应变振幅、应变历程、频率和温度。从动态应力-应变曲线可以求得黏弹性体的许多动态力学性能,如从封闭曲线面积可以求得在一个周期内材料内部的发热量。

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