Enter your name, email, and questions below and we will reply during business hours 8am 5pm est, monday through friday. Technicat library defense technical information center. Huggenberger extensometer readings taken on t\110 speeimensand. Just place the plate at the correct working distance within. Extensometers a for materials testing b c d e f g h i j k l m. An extensometer is an instrument that measures the elongation of a material under stress. It was invented by charles huston who described it in an article in the journal of the franklin institute in 1879.
Attach the locating hook on the free end of the tape to one of the reference points to be measured. Since 1923, more than 420 different engineering structures have been equipped with safety instruments from huggenberger ag. As a result of these shortcomings, the restriction of making only static measurements was regarded as a severe disadvantage. Request pdf validation and modification of extensometer results in karun4 doublecurvature arch concrete dam the present study was conducted to investigate and modify the extensometer results. The single point rod extensometer is an inexpensive, simple, rugged, and reliable device to monitor deformation in under ground workings. Camera the camera has been specifically chosen for the application, the camera is a 2 megapixel digital camera with a fixed lens. Extensometers a for materials testing b c d e f g h i j k. Itsan easy to use class 1 measurement system, having the capability to measure very small strains and high strains,completelycontact free. The system employs up to eight rods, anchored along the axis of a borehole, terminating in the reference head at the. Experimental stress analysis free download as pdf file. In this tutorial, the tutor explains different types of stresses and strains acting on various construction materials. Experimental stress analysis waves sheet metal scribd.
Basically it is maintenance free, splashproof, temperature compensated and of. This invention relates generally to strain gauges for measuring and indicating the strain of material specimens or of life size members. Very high resolution and accuracy allow the determination of youngs modulus and the yield point rp0. Huggenberger extensometer watch more videos at lecture by. The huggenberger tensometer with its double lever mechanism. Pdf measurement uncertainty in extensometer calibration. The lens choice will dictate the following parameters. An extensometer is a device that is used to measure changes in the length of an object. Us3319338a us454499a us45449965a us3319338a us 3319338 a us3319338 a us 3319338a us 454499 a us454499 a us 454499a us 45449965 a us45449965 a us 45449965a us 3319338 a us3319338 a us 3319338a authority us united states prior art keywords legs specimen extensometer leg connector portion prior art date 19650510 legal status the legal status is an assumption and is. A straight hole huggenberger soil instruments movement between anchor. Installation of a rtss video extensometer system the system consists of the following. Borehole extensometers measure displacements in sections in the borehole direction. Uconn mse mechanical testing lab the extensometer will accurately measure strain by clamping onto the reduced area portion of a sample and mitigate the effects of grips on position measurement.
No part of this instruction manual may be reproduced, by any means, without the written consent of geokon. Olson is an environmental geologist forthe forest service u. A number in parentheses indicates the year of last reapproval. Universal tensile strength testing machine with extensometer. Huggenberger tensometer article about huggenberger. Clipon axial extensometer type mini mfa 2 suitable for almost all types of samples up to o 25 mm or 25 x 25 mm and a gauge length lo of 100 mm. Certified for compliance with the center for devices and radiological health as a class ii product.
Extensometer at best price in india indiamart business directory. Accordingly, slopes of the stressstrain curve will be characterized numerically by strain per unit stress, the reciprocal of conven tional ratio, and the values will increase as the slopes become flatter. Laboratory, lehigh university, bethlehem, pennsylvania. Huggenberger extensometer tutorials point india pvt. A third type of target, a datum magnet, maybe rigidly fixed to the lower end of the access tube.
The highresolution automatic extensometer is suitable for a wide variety of applications that require linear strain measurement. Get info of suppliers, manufacturers, exporters, traders of extensometer for buying. Find here online price details of companies selling mechanical extensometer. A typical rod extensometer consists of a reference head, usually installed at the collar of a drill hole, and one or more inhole anchors, each of which is fixed in place at a known depth in the borehole. For manual measurement the user friendly readout unit indipoc is used to. Extensometer article about extensometer by the free dictionary. Thus, for large strain measurements where errors of a few percent of the total strain are acceptable. Huggenberger extensometer sets of levers are been used in this to magnify the displacement. Electrical measurement techniques were to provide the solution. A hollow flush pvc tube is installed in a borehole. What informations can we get by using the extensometer during. The differences between direct and indirect elongation measurement.
Aug 30, 2010 tensile testing performed on a stainless steel tensile specimen to failure using a computerized tensile test machine. Hypertext links the electronic document has many hypertext links displayed in a blue font. Uconn mse mechanical testing lab the extensometer will accurately measure strain by clamping onto the reduced area portion of a sample and mitigate the. The model a3 extensometer is one of the easier types to install since the measurement rods and groutable anchors can be assembled on the ground. Also undertakes repair and modification of extensometers. Specifications for extensometers include gauge length, which is the distance between the knife edges at the start of the test and percent travel or elongation during test. Standard test method for tensile properties of plastics1. A mechanical extensometer known as huggenberger extensometer, with magnification of change in length of the order of 1200. Junction box compressive force hbeam silo leg vti extensometer installation the vt1 is installed on one of the silo support legs. The magnetic extensometer system is a geotechnical tool used to measure settlement and heave of.
Adjustable field of view allows the extensometer to test a wide range of samples. The geosense geoxb2 borehole rod type extensometer range is used to measure and locate settlement, displacement and deformation in soil and rock. Tensile testing a stainless steel tensile specimen youtube. Meets astm b1 extensometer classification 25 mm1 in. An extensometer measures yield strength at different loads. Extensometer for determining strains on a tensile and torsion. It is an object of my invention to provide an improved extensometer that, in one. The bar is fixed at one end and is free moving at the other, where an. The information contained herein is believed to be accurate and reliable.
Epsilon model 3542 axial extensometers are general purpose instruments suited for compression, axial tensile and cyclic testing the model features 5% to 100% strain measuring ranges and gauge lengths from 0. Our 2018 extensometer catalog, version 110 is now available. Measures the initial gage length of the specimen directly. Maintenance free description the magtrol kg05 extensometer is designed for measuring deformations of construction or machined parts under load. The mexid extensometer is a miniaturized version of the multipoint extensometer. The choice of extensometer depends on the requirements. Stability and movement behavior of soil and rock masses can be determined by the use of borehole extensometers.
Find out information about huggenberger tensometer. Metrology, instruments, sensors, beaconing, signalisation. It is useful for stress strain measurements and tensile tests. Product information high temperature extensometers for creep. E10 rod extensometer datasheet e10 features benefits description the rod extensometer system accurately measures settlement andor heave between single or multiple anchor points in a borehole and at its reference head. The double point extensometer incorporates the use of two points which allows the engineer to distinguish between dangerous deep seated movements and more trivial surficial spalling.
All blue words in the body text, along with all contents entries and. Extensometer definition of extensometer by merriamwebster. Huggenberger soil instruments movement between anchor and surface appears as translation of top of rod relative to surface. Extensometers article about extensometers by the free. By using an extensometer for direct extension measurement all additional deformation as load frame, load cell, grips or fixtures or strain in the nonparallel section of the specimen is excluded. Because its output signal is proportional to the applied load, it can be used as either a load cell or a force transducer. Spider magnets consisting of donuts with equally spaced magnets embedded inside and sprung legs are threaded over the pvc tube and pushed to their required depths using an insertion tool. Manufacturer of axial and transverse extensometers, cod gages, deflectometers and calibrator stands for the materials testing industry. E continuous rod extensometer features benefits description the continuous rod extensometer system accurately measures settlement andor heave at single or multiple anchor points in a borehole and at its reference head. Then least count of change in length on gauge length is 0. D222, d221bm, dte multipoint rod extensometers are installed in borehole to monitor displacements at various depths using rods of different material and lengths. No need for 35 different clipon extensometers, video extensometers can measure the strain of virtually any sample size. Unlike traditional extensometers, where users have to know where to place the extensometer prior to the test, the dic software maps the entire specimen surface and records fullfield information, allowing users to draw virtual extensometers anywhere on the specimen after the test. It can be viewed on any computer that has adobe acrobat reader installed.
This manual is available as an electronic document in the portable document file pdf format. Most often they are connected to a test machine controller, and epsilon will equip the extensometer with a compatible connector wired to plug directly into the controller. In order to overcome these limitations, the me53 laser speckle extensometer was developed by the austriancompanymessphysikgmbh,onthebasisthatifitcanbeseen,thenitcanbemeasured. Properties of engineering it is now clear from the discussion in chapter 7 that the structural designer requires a knowledge of the behaviour of materials under different types of load before heshe can be reasonably sure of designing a safe and, at the same time, economic structure. He works in a region that includes 18 national forests in utah nevada.
Freegrid strain gages, hightemperature strain gages. The quantity to be measured is usually indicated in a greatly enlarged scale on a dial by means of a special mechanism which heretofore has included only levers or only pinions or a combination of these elements. Validation and modification of extensometer results in. Geonor rod type multiple point borehole extensometer. Huggenberger ag was established in 1900 and is a swissbased company specializing in safety instrumentation to monitor movement in dam walls, tunnels, rock slopes and anchoring. Extensometers are used to accurately measure specimen extension during tensile testing. Boreholes should be free of debris and drilled slightly longer than the. Mts fundamentaltm automatic extensometer fax accurate axial and transverse strain measurement reduce inconsistencies and improve the accuracy of test results with an mts fundamentaltm automatic extensometer fax. The ave 2 is a noncontacting video extensometer that provides accurate and repeatable strain. Mpbx multipoint borehole extensometers reference products codes. Product information high temperature extensometers for creep testing creep tensile on metals 4rodextensometer 31400 ceramic and metal version accessories for temperatures up to 850c inserts for different specimen shapes and sizes round specimen.
The mexid extensometer is supplied completely mounted with preinstalled electrical or vibrating wire displacement transducers to enable very fast and simple installation. Model 3442 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. The symbol used is followed by a suffix giving the specified percentage of the original gauge length 0 or of the extensometer gauge length te, for example. However, geokon assumes no responsibility for errors, omissions or misinterpretation.
Strength of materials is an important subject to understand the behavior of objects under stress. Universal video extensometers for strain measurement. Abrams in bulletin 71 of the university 3 of ill1nois experiment station. Extensometer is a device that is used for precise measure of the specimen deformation strain, basing on it and the effective stress you can calculate the modulus of elasticity.
For displacement measurements at the tunnel face, solexperts has developed and successfully applied the mrhx extensometer. Extensometers barswiresfiberoptical sensors relative distance. The elongation of the material is a physical deformation of the sample and is a type of strain associated with tensile measurements. Analysis of borehole extensometer data from central california entire aquifer system in the elastic range. Portable electronic measuring instrument for the detection of linear movements. An introduction to stress analysis and transducer design using. Huggenberger extensometer watch more videos at comvideotutorialsindex. Capabilities of existing subsidence monitoring instruments. An easytouse adapter is available for use with the standard electronics in an instron test machine. Because composite materials do not substantially deform before failure, the extreme precision of a bonded strain gauge can sometimes be preferable to the use of an extensometer for astm d3039 testing. In most cases, the nominal gage factors of well annealed constantan high elongation gages are within a few percent of 2. The mexid extensometer is supplied completely mounted with preinstalled electrical or vibrating wire displacement transducers to enable very.
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