金属丝杨氏模量的测量方法

介绍金属丝杨氏弹性模量的概念和计算的理论依据,探讨测量金属丝微小伸长量的方法。详述光杠杆放大法和光电传感器法检测杨氏弹性模量的工作原理,给出检测原理图,并分别用2种方法测量长1.10 m、直径0.608 mm钢丝的杨氏模量。使用证明:光杠杆放大法测量精度高,但仪器调整难度大;光电传感器法用激光做光源,利用光电传感器作为接收器,可以直接读出伸长量的对应数值,是测量杨氏模量的简便方法,但测量精度不及光杠杆放大法。     

电阳应变式传感器的温度误差及其补偿

系统分析了电阻应变式传感器在实际应用中由于会受周围环境温度等因素的影响产生的附加误差,为解决此类问题,文章给出了几种温度补偿的方法来提高测量精度,保证测量的准确性.     

应变式三轴力传感器的ANSYS分析与应用

应变式三轴力传感器可用作车床切削力的测量,但其应变原理使传感器被施加压力后会产生相应的形变量,会影响到机床的加工精度。本文对LH-SZ-05三轴力传感器进行ANSYS分析及载荷试验,从试验和有限元分析方面验证应变式三轴力传感器对机床切削力测量的可行性,为应变式三轴力传感器的进一步制作和应用奠定了基础,为数控机床高速切削状态下切削力测试奠定基础。     

电阻应变式传感器的温度误差及其补偿

系统分析了电阻应变式传感器在实际应用中由于会受周围环境温度等因素的影响产生的附加误差,为解决此类问题,文章给出了几种温度补偿的方法来提高测量精度,保证测量的准确性。     

扭矩秤用的测力传感器

在进行拖拉机机组的科学研究和台架试验时,广泛使用一种装有扭矩秤的平衡机。利用扭矩秤测量,基本上能做到目视记录被测的参量。随着试验技术的发展,要求将被测的扭矩量转换为成比例变化的额定电信号,以便将电信号传递给信息测量系统或自动控制系统。苏联国家拖拉机科学研究所研制成一种结构简单、制造方便和外形尺寸小的新型应变式测力传感器。这种传感器可用来     

电阻应变式称重传感器的设计

介绍了一种基于双孔梁称重的电阻应变式传感器.它可称量被试木材在某一时刻的重量,以计算该试材在该时刻的含水率.该方法的准确度和稳定性不受木材材性影响,且与木材含水率不均性无关.     

织机经纱张力传感器的设计与实现

在织机经纱张力检测中,张力传感器起着重要作用.为了准确测量织机纺纱张力,设计了一种应变式S型单孔力传感器并将其用于经纱张力检测,完成了传感器电路设计,建立了其力学模型并对其做了应力分析.该传感器经过在力试验机上进行测试,测力精度及灵敏度都较好,其技术指标及功能均可满足实际生产中的检测精度要求,并且具有结构紧凑可双向受力的特点.     

聚吡咯涂层织物的研究进展

近年来,研究发现导电聚吡咯电学性能优异,结合到织物表面做为柔性基底材料,在智能可穿戴方向有很广泛的应用前景。文章着重介绍聚吡咯涂层织物的原位聚合法、气相沉积法和电化学法制备方法,总结了聚吡咯涂层织物在应变式织物传感器、超级电容器、电磁屏蔽和生物抗菌性等方面的应用。     

一种井下管柱载荷测试方案

提出了一种基于电桥应变片结构测量油井管柱拉压载荷的方案。通过电阻应变式传感器检测井下管柱封隔器的应变力来测试其载荷大小。井下数据采集模块采集的数据经控制芯片存储于SD卡中,测试完毕后测试短接随管柱一起出井,用地面PC机读取SD卡中数据,即可对历史数据进行分析。此方案具有存储式,便携式,测试数据量大的优点,对油井封隔器管柱失效问题的解决提供了实测载荷数据的可行方法。     

光纤Bragg光栅应变传感器在纱线张力测量中的应用

为了解决纺织工业中检测系统和传感器件可靠性低、寿命低和抗干扰能力差的问题,提出了一种新型的基于光纤光栅技术的测量纱线张力的传感器.分析了光纤Bragg光栅应变传感器的基本原理并进行了相关实验.实验表明光纤Bragg光栅应变传感器具有良好的线性和重复性,系统灵敏度可以达到0.01 gf.     

锭脚数显测试仪的研制

介绍了锭脚业测试仪采用的电阻应变片动态测量装置,通过非电量电测法而精确的测定锭脚同轴度和轴承的内径尺寸。该测量仪实现了自动测量,使用方便,且可实行现场测试,较现行传统的手用塞规测量方法,明显提高了测量精度,解决了生产中的难题,有利于提高锭的制造精度,改善轴承锭子的工作状态,提高锭子的使用寿命。     

用百分表测金属丝的杨氏弹性模量

简要介绍了用百分表测钢丝杨氏弹性模量的原理及方法 ,同时阐明了此方法的主要优点 ,并将此法的测量结果与传统测量光杠杆法的结果作了进一步比较 .     

Morphology of the Bagasse Fibers Obtained from the Elaboration Process of Mezcal and Effects on Their Tensile Properties

The morphology of the cross-section and longitudinal-section of bagasse fibers of Agave angustifolia Haw from the elaboration process of mezcal were investigated and tensile tests were performed in function of the diameter (0.20–0.79 mm), gauge length (10, 15 and 20 mm) and strain rate (5–50 mm/min). The cross-section of the fibers is ribbon-shape like with dislocations and the longitudinal section has mechanical damage in its surface. The ultimate tensile strength (14.83–86.51 MPa) and Young’s modulus (0.20–1.26 GPa) are influenced by the diameter and the strain rate, while the strain at failure (16–26%) is influenced by the gauge length. These results are discussed in light of information on relationship between morphology and tensile properties of natural fibers and possible effects of the elaboration process of mezcal.     

Microstructural Study,Tensile Properties,and Scanning Electron Microscopy Fractography Failure Analysis of Various Agricultural Residue Fibers

This paper presents an approach to examine the microstructural properties and mechanical behavior of coconut husks, banana pseudo-stem, pineapple leaf, and sugarcane bagasse fibers by scanning electron microscope and mini-tensile tester, respectively. Single fiber bundles were examined by using scanning electron microscope. Tensile tests were performed at different diameters (0.15–0.55 mm) and gauge lengths (10, 15, 20, and 30 mm/min) to assess the effects of diameter and gauge length on tensile properties. It was found that fibers consisted of different types of regularly arranged cells. The tensile strength (310 MPa) and Young’s modulus (7.4 GPa) of pineapple leaf fiber bundles showed the highest value compared to the other fibers. The tensile strength and Young’s modulus decreased with the increase of diameter and gauge length of fiber bundles. Scanning electron microscopic fractography analysis showed comparatively heterogeneous ruptures associated with more participants of microfibrils for pineapple leaf and banana pseudo-stem fibers compared to coconut husk and sugarcane bagasse fibers. These fractographic observations were discussed in the light of current knowledge of the microstructure of each fiber and the corresponding mechanical properties.     

杨木胶合板动态杨氏模量的检测与分析

基于LabVIEW软件采用共振法和敲击法测定杨木胶合板的动态杨氏模量,并与其静态力学性能对比。结果表明：敲击法和共振法得到的动态杨氏模量值较为接近;共振法得到的动态杨氏模量与胶合板的静曲强度、弹性模量呈显著线性回归;杨木胶合板的动态杨氏模量与取样方向有关,沿表板纹理纵向测定值大于横向测定值,且纵向动态杨氏模量与密度呈显著线性相关。     

印染企业的水平衡监测

通过水量平衡测试工作,采用水表计量法实时监测工厂的水资源利用情况;经过对二级表监测率随用水量变化的情况以及其它测试数据的科学分析,可判断漏水点存在与否,以节约水资源,达到节能降耗的目的。     

Tensile properties of cork in axial stress and influence of porosity, density, quality and radial position in the plank

The behaviour of cork under tensile stress in the axial direction was studied for samples taken from cork planks of good (class 1) and poor (class 4) quality grades and at three radial positions within the plank (inner, mid and outer positions). The effect of cork density (ranging from 0.123 to 0.203?g?cm^?3) and porosity (ranging from 2.8 to 9.6% in the tangential surface) on Young??s modulus and fracture stress and strain was studied. The tensile stress-strain curves of cork showed an elastic deformation up to 2% strain with a Young??s modulus of 30.8?MPa, and a fracture stress of 1.05?MPa at a strain of 7.1% for class 1, and Young??s modulus of 26.1 MPa, and a fracture stress of 0.77?MPa at a strain of 5.5% for class?4. Fracture always started at a pore. The quality class and the radial position in the plank were highly significant factors of the tensile properties variation with good quality cork in the inner part of the plank showing the highest strength. Density influenced the elastic behaviour of cork with a highly significant correlation of increasing E with density, but not so clearly the fracture stress and strain. The variability of tensile properties with porosity was large and although significant, the correlations were lower in spite of a decreasing trend of E with porosity. Fracture depended on the type of defects in cork.     

Experimental methods to determine in-plane material properties of polyurethane-coated nylon fabric

Experimental procedures have been developed to obtain the mechanical stiffness and strength properties of an orthotropic polyurethane-coated nylon fabric for use in a finite element analysis of an inflatable, deployable structure. A method that utilizes a specialized material test fixture and photogrammetry to collect the linear and angular displacement data has been employed. Different material holding methods were compared with the objective of producing strength values not influenced by gripping and that allow for use of machine displacement to estimate longitudinal strains during cyclic testing. A series of tension and bias tension tests provided material properties such as Young’s modulus in both warp and fill directions, Poisson’s ratios in plane and through the thickness, and shear modulus. Results obtained from the photogrammetry method show good correlation to machine readings using a pinched gripping method. Additionally, cyclic tests gave the continuous load–unload response and the hysteresis characteristics of the stress–strain in plane and indicated the degree of material degradation. The shear stress–shear strain behavior and shear modulus values are acquired using bias tension tests on 45° skewed specimens.     

惯性回转振动机械玻璃钢吊杆杨氏模量的试验研究

以工程实际中惯性回转振动机械常用的玻璃钢杆为研究对象,以杆上端固定、下端自由的铅垂悬臂梁为实验模型．采用敲击法测得玻璃钢杆的杨氏模量。研究结果表明,玻璃钢杆的杨氏模量与其自身长度有关,实验得到了长度为500mm到1000mm时玻璃钢杆的杨氏模量,为该类机械的设计计算提供参考。