1) Hopkinson pressure bar
Hopkinson压杆
1.
Design Criterion in Dynamic Fracture Control of Steel Constructions and Design for Hopkinson Pressure Bar;
钢结构防动载断裂设计准则及Hopkinson压杆的设计
2.
Dynamic fracture toughness(KId) of 12Cr1MoV steel at various temperatures is tested with Hopkinson pressure bar used to impact specimens and liquefied nitrogen and alcohol used to modulate experimental temperature.
采用Hopkinson压杆装置对试样冲击加载,完成了12Cr1MoV钢在不同温度冲击条件下动态断裂韧性的测试。
3.
In the present paper,a kind of pneumatically synchronous mechanism is used to the split Hopkinson pressure bar,the technique of high strain-rate loading for a sample at high temperature is introduced.
本文介绍了在分离式Hopkinson压杆装置上通过使用一种气动同步机构,实现对试样进行高温高应变率加载的技术。
2) Hopkinson bar
Hopkinson压杆
1.
By using MTS(Mechanical Threshold Stress)model and the experimental technique of the split Hopkinson bar with the synchronization assemblage,the dynamic constitutive equation of the unidirectional-solidified horizontal-continuous-casting polycrystal copper was investigated.
以带有同步组装技术的分离式Hopkinson压杆装置作为热模拟装置,采用基于MTS(MechanicalThresholdStress)模型建立的FCC晶体结构的动态本构方程,确定了定向凝固水平连铸多晶铜动态本构方程参数,研究了其动态冲击特性,获得高温段(685K~1085K)的理论应力-应变曲线与实验曲线相当吻合,而在低温段(低于685K)的理论曲线与实验曲线出入较大。
2.
By using MTS (Mechanical Threshold Stress) model and the experimental technique of the split Hopkinson bar with the synchronization assemblage, we determined theoretically the parameters of the dynamic constitutive equation of the continuous casting polycrystal copper.
以带有同步组装技术的分离式 Hopkinson压杆作为热模拟装置 ,采用基于 MTS( Mechanical Threshold Stress)模型建立的 FCC晶体结构的动态本构方程 ,确定了多晶铜动态本构方程参数 ,研究了连铸多晶铜的动态冲击特性 ,获得的理论应力 -应变曲线与实验结果相当吻合 ,但不能描述 485～ 5 85 K间回复与再结晶温度区间的变
3) split Hopkinson pressure bar
Hopkinson压杆
1.
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。
2.
The ConeCylinder Projectiles are applied in the split Hopkinson pressure bar experiments.
本文在分离式Hopkinson压杆系统中,探索了应用变截面锥形弹丸实现常应变率力学性能测试的实验方法,以及在较高应变率下实现动态卸载以获取材料的动态弹性模量的可行性。
4) split Hopkinson pressure bar(SHPB)
分离式Hopkinson压杆
1.
Experiments with strain rate varying from 101 s-1 to103 s-1 on granite and concrete under uniaxial compressive loading are conducted with the modified split Hopkinson pressure bar(SHPB).
采用黄铜波形整形器改进后的分离式Hopkinson压杆装置,分别对花岗岩和混凝土试件进行不同应变率(101～103)s-1下的单轴冲击压缩试验,有效地减少传统Hopkinson压杆试验中,岩石类脆性材料在内部应力达到均衡之前过早破坏以及输入波的高频震荡给试验数据带来的波动性。
2.
There exist three main problems in the split Hopkinson pressure bar(SHPB) technique of measuring the dynamic properties of concrete material,which are the restriction of nonuniform stress (strain),the dispersion in wave propagation due to the large-diameter SHPB,and the influence of initial rising point of stress wave.
根据实验和理论分析,目前分离式Hopkinson压杆装置(SHPB)间接测量混凝土材料动态应力—应变关系时主要存在三方面问题,分别是应力应变不均匀的限制、大尺寸SHPB压杆产生的应力波弥散及数据处理时应力波波头选取的影响。
3.
The Split Hopkinson Pressure Bar(SHPB) is an ideal tool in carrying out high-speedloading to quasi-brittle materials, it can afford many loading means loading means to mensurate materials properties under dynamic loading.
分离式Hopkinson压杆是对准脆性材料实施高速加载的理想工具,利用该装置可以对准脆性材料实施各种加载方式,测定材料的动力特性参数。
5) Split Hopkinson pressure bar
分离式Hopkinson压杆
1.
Dynamic tests were made at strain rate 10~2 s~(-1)～10~3 s~(-1) by split Hopkinson pressure bar(SHPB),with bullet speeds of 4 m/s～15 m/s,and semiconductor gage was used on the transmitted bar.
在分离式Hopkinson压杆(SHPB)上做了铜基粉末冶金摩擦材料在102s-1～103s-1应变率范围内的冲击试验,弹速范围为4m/s～15m/s,在透射杆上采用了半导体应变片技术;在MTS实验机上做了该材料在10-4s-1～10-3s-1应变率范围内的准静态实验,分别在应变为0 005,0 010,0 020,0 035时卸载再加载,以验证材料的黏弹塑性特征。
2.
The split Hopkinson pressure bar test equipment was improved through adopting multi-measures.
采取多种措施改进了分离式Hopkinson压杆试验技术,用改进的设备对三峡坝址处的花岗岩进行了大量的动态单轴压缩试验和劈裂试验,发现该岩石具有明显的应变率效应,其动态压缩破坏呈3种形态:边缘崩落、留心破坏、完全破坏;探讨了相应的破坏机制;分析了应变率对动态弹性模量和动态抗压强度的影响;以Hoek-Brown破坏准则为基础建立了相应的动态破坏准则。
3.
The split Hopkinson pressure bar with a diameter of 100mm and the Brazilian disc and the flattened Brazilian disc specimens subjected to diametral impact compression were used.
利用直径为100mm的分离式Hopkinson压杆径向冲击巴西圆盘和平台巴西圆盘试样,测试了大理岩在高应变率加载下的动态力学性能。
6) SHPB
分离式Hopkinson压杆
1.
Dynamic mechanical properties of four aluminum alloy were attained with the split Hopkinson pressure bar(SHPB) apparatus.
利用分离式Hopkinson压杆实验设备测定了4种航空铝合金材料的动态力学性能,根据材料的应力应变曲线特性,选择Cowper-Symonds模型来拟合4种材料的动态本构。
2.
The problems of Split Hopkinson Pressure Bar(SHPB) technique used for measuring dynamic stress strain curve of concrete were discussed.
讨论了分离式Hopkinson压杆装置间接测量混凝土材料动态应力-应变曲线存在的问题。
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