Correction to : Estimating Measurement Uncertainty on Stress-Strain Curves from SHPB

Experimental Mechanics - Equation (12) in the original article [1] gives the strain from the measured voltage on a full bridge configuration of the four strain gages. The full-bridge is intended to...     

Estimating Measurement Uncertainty on Stress-Strain Curves from SHPB

Split Hopkinson Pressure Bar tests are commonly used to determine material stress-strain relationship at high deformation rates. Obtaining this relationship is dependant both on certain assumptions and substantial post-processing of the data recorded during the test. Measurement uncertainty rarely appears on the resulting curves. This article introduces a simple method of estimating the measurement uncertainty associated with SHPB tests.     

基于SHPB波传播系数法试验的衰减弥散修正研究

针对SHPB试验中的波传播衰减弥散问题,基于杆自由端撞击的波传播系数法试验原理,选取Φ100mm PA66尼龙杆为典型Hopkinson压杆,依据SHPB试验中获取试样应力-应变曲线的二波法,对原位测试试验中从加载试样传来的反射波弥散进行修正研究,获得入射杆反射波传播系数;同理,对透射杆获取透射波传播系数。根据修正后的实际反射波和透射波历程,获得试样的应力-应变曲线。通过比较分析,此方法合理可靠。     

SHPB装置应用于测量高温动态力学性能的研究

ＳＨＰＢ（分离式Ｈｏｐｋｉｎｓｏｎ压杆）装置由于具有结构简单、操作方便等优点，为人们普遍采用；但作测量材料的动态高温力学性能方面还存在诸多不便之处。本文研究了附有恒温加热炉的ＳＨＰＢ装置，利用一维应力波传播理论和传热学原理，修正了温度梯度场对波形测量的影响，从而使ＳＨＰＢ装置用于高温动态力学测量更为准确可靠；并实际测量了３０ＣｒＭｎＳｉＡ钢从室温到高温（６００℃）的动态（１．５～４．０×１０３ｓ－１）应力应变曲线。     

基于数字图像的分离式霍普金森压杆实验中试件应变及两端应力的同步测量法

本文提出一种基于高速摄像和数字图像相关方法(DIC)的分离式Hopkinson压杆(SHPB)测量技术,从而实现试件应变和两端应力的同步测量。即在与试件接触的输入输出杆两端制作散斑,通过高速摄像获取SHPB实验过程中的散斑变形图像,由DIC测得各时刻试件的应变、输入输出杆端的应变(可直接换算为试件两端的应力)。由于试件和杆端的应变都是从同一张高速摄影的图像上分析得到的,因此它们是同步的。应用该方法对钢纤维混凝土试件的SHPB试验进行了测量,测量结果与传统应变片测量结果吻合,验证了该方法的可行性。该技术不仅实现了SHPB实验中试件应变和应力的同步测量,还将有助于直接检验各材料在SHPB实验中试件两端的力在实验过程中是否平衡。     

单试样三曲线法测定J积分阻力曲线及条件起裂值

用单试样三曲线法测定了16MnR 钢和某一焊缝金属的 J 积分阻力曲线及其条件起裂值,与标准的多试样测定结果基本吻合.实验表明,单试样三曲线的关联分析反映了带裂纹的三点弯曲试样的宏观断裂物理过程,裂纹的延性扩展符合幂函数规律.     

Correction to: Large deformation plasticity

Acta Mechanica Sinica -     

104s-1应变率下SHPB系统实验相关问题探讨

利用小直径(3.17mm)的SHPB系统初步获得两种较高强度材料(一种特种钢和一种WMo合金)应变率达到104s-1以上的动态压缩应力 应变曲线。通过对这次实验过程及结果的观察和分析,对高应变率实验存在的几个问题进行了探讨。     

Wrinkle-Based Measurement of Elastic Modulus of Nano-Scale Thin Pt Film Deposited on Polymeric Substrate: Verification and Uncertainty Analysis

Wrinkle-based measurement of elastic modulus for a nano-scale thin film was analyzed. As a demonstrative example, the wrinkles of Pt films on a Polydimethylsiloxane (PDMS) substrate under compressive loading were formed with a well-defined wavelength, corresponding to the difference of elastic moduli between the films and substrates. The elastic modulus of the Pt nano-scale thin film measured with the wrinkle-based measurement was found to be consistent with that independently measured with micro-tensile test. Uncertainty of the wrinkle-based measurement was analyzed to figure out the main uncertainty components for the evaluation of elastic modulus measurement, and guidelines for the reliable wrinkle-based measurement were suggested.     

扫描仪精确标定与基于扫描图像的精密测量

分析了普通平板扫描仪扫描过程中引入畸变误差的成因和特点，提出并实现了用分布于待测图像四周的正交网格对包括待测图像在内的全场进行标定的方法和算法．标定后精度提高一个数量级以上，全场几何标准偏差在2—3微米以内，使普通扫描仪可用于精度要求极高的工程测量．用扫描仪将干板等介质记录的图像数字化，通过标定，修正扫描过程中引入的畸变误差，即可利用数字图像处理技术进行自动和半自动的精密测量．     

Correction to: Convective Acceleration in Porous Media

Transport in Porous Media -     

Correction to: Wind-induced vibration of structural cables

Nonlinear Dynamics - The following sentence and both references are incorrectly included in the original article.     

PFM方法在研究COD设计曲线安全裕度上的应用

结合实例用PFM(概率断裂力学)模型敏感性分析,并采用直接取样的蒙特卡罗(Monte Carlo)法和分层取样的蒙特卡罗法,对CVDA-84、PD6493、WES2805的COD设计曲线安全裕度进行了比较研究.结果表明:分层取样法所得结果与直接蒙特卡罗法的结果大体一致.     

Correction to: Low-thrust Lambert transfer based on two-stage constant-vector thrust control method

Nonlinear Dynamics -     

一种双导航系统组合定位数据概率圆半径的评定

对于由双导航系设备(系统)进行组合后的定位输出数据，所获得的船位由于其各自的不确定度不同，将其融合后所得的船位应为双导航设备给出船位的加权平均，融合后的定位概率圆半径也应由不确定度进行新的重新评定。文中给出了基于不确定度的双导航设备组合后的定位输出数据融合评定，并给出了新的定位概率圆半径计算方法，使由双导航设备组成的组合导航系统的导航参数输出具有更好的可信度。其结论可推广至多导航设备(系统)的组合导航输出导航参数的评定。     

Correction to: Relating Darcy-Scale Chemical Reaction Order to Pore-Scale Spatial Heterogeneity

Transport in Porous Media -     

Correction to: Rarefied gas effect in hypersonic shear flows

Acta Mechanica Sinica - In the original publication two mistakes caused by typesetting emerged during the Springer internal production     

Correction to: On inner constraints in plane circular arches

Archive of Applied Mechanics - The series expansions in Eq. (16) of [1] for trigonometric functions depending on a small evolution parameter shall be corrected.     

Correction to: Dynamic behavior analysis of tethered satellite system based on Floquet theory

Nonlinear Dynamics -