Calibration of a hopkinson bar with a transfer standard article pdf available in shock and vibration 12 january 1993 with 55 reads how we measure reads. Calibration barcoding can be done on 2x2 labels and even scanned back in to our calibration software. Split hopkinson pressure bar operations manual 592014 figure 24. Finite elements method in split hopkinson pressure bar. Find the best calibration management software for your business.
Dynamic characterization method of accelerometers based on. Calibration automation software typically includes features for documenting calibration procedures, storing calibration data, and producing reports, allowing you to eliminate paper records or spreadsheets. Easycal software enables users to manage, automate and optimise the calibration process, it is a calibration management software with comprehensive features for laboratory, office and site. Contactless measurement with extensometer 200xr during a material test on the split hopkinson bar. Hopkinson bar, dynamic test, mechanical properties, operating software. Bob gregg is the president of norfox software, which produces and distributes. Calibration of split hopkinson pressure bar system with special. A calibration procedure for the experimental setup using an. Later, in 1949 herbert kolsky refined hopkinson s technique by using two hopkinson bars in series, now known as the split hopkinson bar, to measure stress and strain, incorporating advancements in the cathode ray oscilloscope in conjunction with. Bar shpb, also referred to as kolsky bar is a commonly used setup for high strain rate testing. The characteristics of a piezoresistive accelerometer in shock environments have been studied at sandia national laboratories snl in the mechanical shock testing laboratory for ten years. Please also visit our youtube channel to see more application examples.
Then, if the calibration pulse for any channel or both channels was not. The hgi calibration recall software program allows you to take control of the equipment maintenance process by helping to reduce downtime, and maintain equipment history, while sequentially assessing a tools continuing usability in a production. Spray paint background matt black, attach matt white measuring marks, clamp matt black specimen. Because there is no national institute of standards and technology traceable calibration capability at shock levels of 5,00015,000 g for the temperature extremes of. A split hopkinson bar is used to dynamically determine material constants, for example youngs modulus or mechanical stress. The testing was done with the split hopkinson pressure bar shpb system and the calibration is performed with veryst engineerings mcalibration software.
Calibration of the splithopkinson pressure bar setup. High g accelerometer calibration calibration the modal. Below are references for the theory, setup, calibration, gage mounting, sample testing and software instructions for users performing high strain rate testing on materials using a shpb kolsky bar. The calibration technique is general and probabilistic, meaning the calibration uncertainty is represented in the form of a probability distribution. Calibration systems include shock accelerometer calibration based on hopkinson bar, transverse sensitivity, calibration of accelerometers at various temperatures includes environmental chamber temperature control, shaker motion control, data acquisition and processing as well as data aquisition and processing systems for turbomachinery and. This class will demonstrate the use of split hopkinson bar tests and traditional uniaxial tests, and provide handson exercises for how to use the experimental data to calibrate suitable material models. In the picoscope 6 software, there are a few settings that need to be changed. This class will demonstrate the use of split hopkinson bar tests and traditional uniaxial tests, and provide handson exercises for how to use the experimental data to calibrate suitable material. Calibration systems include shock accelerometer calibration based on hopkinson bar, transverse sensitivity, calibration of accelerometers at various temperatures includes environmental. Calibration barcoding calibration management software. Whether you are a commercial calibration company performing services for your clients, or an inhouse calibration organization working to meet your internal customers requirements, qualer is the.
Pdf the split hopkinson bar test is the most traditional method to obtain the. With acceleration levels from 1,000 to 100,000 g, the model k9560d utilizes the hopkinson pressure bar for the generation and acquisition of referenced shock inputs. The characteristics of a piezoresistive accelerometer in shock environments have been studied at sandia national laboratories snl in the mechanical shock testing laboratory for ten years the snl shock laboratory has developed a capability to characterize accelerometers and other transducers with shocks aligned with the transducers sensing axis and perpendicular to the transducers sensing axis. Evolution of specimen strain rate in split hopkinson bar test. Calibration test bars provide the ability to test for static accuracy of machinery and are produced per din standards. The model k9560d hopkinson bar for high g calibration is a fully automated, turnkey system for calibrating and verifying high g range shock accelerometers. Shpb calibration manual and sample test compression rel, inc. It helps you to keep inventory and reminds you the scheduled dates. By kevin young a thesis submitted to the faculty of graduate studies through the department of mechanical, automotive and materials engineering in partial fulfillment of the requirements for the degree of master of applied science at the university of windsor. Based on the digital image correlation technique, the q450 system is designed for fullfield vibration analysis and high speed transient events.
Simco provides worldwide calibration services through its network of laboratories and onsite service teams. Calibration services for test and measurement equipment. The article, evolution of specimen strain rate in split hopkinson bar test, by h shin and jb kim reports a method of validating the experimental result of the split hopkinson bar. A calibration industry leader since 1962, simco provides trusted, highquality instrument calibration services for thousands of organizations, including 15 of the top 20 global. Split hopkinson bar testing is a method in materials testing that enables material properties to be determined in dynamic conditions. The bar code feature built into procalv5 makes it simple to not just print bar codes but also scan them in. Evaluation of a hopkinson bar flyaway technique for high. As early as shpb was first introduced as a useful dynamic testing tool, it was. The use of thermoplastic material for the incident and transmitter bar requires detailed. A split hopkinson pressure bar shpb, also known as a kolsky bar, is a test apparatus used to characterize the mechanical response of materials deforming at high strain rates 102 104 s1. Youngs modulus is a material constant that is a measure for how much a component is deformed when a force is applied to it. If you have the appropriate software installed, you can download article citation data to the citation manager.
The testing was done with the split hopkinson pressure bar shpb. There are many applications possible with dic, so please contact us if you have any questions about your specific measurement needs. In this paper are analyzed and evaluated by the simulations means three major topics. Optical components and software for calibration according to iso 1606341. B calibration of split hopkinson pressure bar setup. Bob gregg is the president of norfox software, which produces and distributes calibration management software. A splithopkinson bar is used to dynamically determine material constants, for example youngs modulus or mechanical stress. Construction of data acquisitionprocessing system for.
The fundamental results delivered by david are the speed and force at both specimen faces. Simco has received several important calibration industry awards for outstanding service and performance. Calibration services for test and measurement equipment simco. The model k9560d hopkinson bar for high g calibration is a fully automated.
The hgi calibration recall software program allows you to take control of the equipment maintenance process by helping to reduce downtime, and maintain equipment history, while. The procalv5 bar code feature allows you to print 2 x 2 bar code labels from procalv5 that may be affixed to all types of items recognized by procalv5. Dynamic rock tests using split hopkinson kolsky bar system a. Calibration is performed by comparing the wave speed of the initial pulse versus the reflected pulse and calculating the energy ratio. Shpb calibration manual and sample test compression shpb equations used in surepulse. Below are references for the theory, setup, calibration, gage mounting, sample testing and software instructions for users performing high strain rate testing on materials using a shpb. It cal also be used for the calibration of the instrument. Calibration test arbors are available in various lengths, and also in custom sizes, and the following versions. Pdf a software for a dual split hopkinson bar machine. The split hopkinson bar shb, 24,25 which is also called the kolsky bar, has been used extensively for measuring the uniaxial stressstrain curves of various materials at high. Use calibration control our calibration software to manage equipment and tools that require regular checks to confirm continued reliability and usefulness. Im trying for the first time to do a ball bar calibration. This webinar will give an introduction to the split hopkinson bar tests as well as discuss the required data acquisition systems for this type of testing.
The hopkinson bar system consists of a titanium alloy bar, a differential laser doppler interferometer, an air compressor, a vacuum pump, the signal processing system, and the calibrated object, as shown in fig. A method for dispersive split hopkinson pressure bar. The hopvhs works according to the hopkinson bar principle. A split hopkinson bar technique has been developed to evaluate the performance of accelerometers that measure large amplitude pulses. Equipment downtime for calibration is a necessary step in the processes for any production line.
Highshock exciter for the amplitude range up to 100,000 g n optionally up to 200,000 g n to be used in calibration or test applications. The calibration data will be used in conjunction with. Ensure that the transmission bar will not contact the incident bar during shot, leave approximately 3 between ends of bars. The use of thermoplastic material for the incident and transmitter bar requires detailed calibration experiments to quantify the dispersion in the bars. The qualer platform provides bestinclass functionality, with our calibration management software, for tracking asset calibrations and maintenance. The splithopkinson pressure bar, named after bertram hopkinson, sometimes also called a kolsky bar, is an apparatus for testing the dynamic stress strain response of materials. Easycal is a complete software package with features covering all aspects of calibration work and management. The split hopkinson bar shb, 24,25 which is also called the kolsky bar, has been used extensively for measuring the uniaxial stressstrain curves of various materials at high strain rates 10 2 to 10 4 s.
The split hopkinson pressure bar shpb testing technique has been used to derive the constitutive equations of engineering materials at high strain rate using the reflected and. Dynamic material testing, such as in a split hopkinson bar test, requires highspeed data acquisition daq and sensors with enough bandwidth to capture these dynamic impulses. The hopkinson bar is a kind of specific device for impact accelerometer calibration. The use of the split hopkinson pressure bar shpb techniques for materials testing under a high rate of loading is described, including various modifications of the original compression testing setup for tension testing, torsion testing and dynamic fracture testing. Pdf calibration of a hopkinson bar with a transfer standard. An evaluation of this technique has been conducted in the mechanical shock laboratory at sandia national laboratories snl to determine its use in the practical calibration of accelerometers. Dynamic material testing, such as in a splithopkinson bar test, requires highspeed data acquisition daq and sensors with enough bandwidth to capture these dynamic impulses. If youve heard about the benefits of automated calibration and asset management but are puzzled. A series of fem simulations of shpb test were used in designing of split hopkinson pressure bar. Development of a tensile split hopkinson pressure bar testing facility. The split hopkinson pressure bar shpb is also called the davies bar or the kolsky bar after those who developed the modern shpb system on the basis of the original hopkinson bar.
Dynamic tests are usually conducted using the split hopkinson bar or kolsky bar. Below is a list of popular dic applications, sorted by industry, where vic systems are currently deployed to obtain data. How to calibrate bars in split hopkinson pressure bar. He has been involved with computer software implementation for 20 years, including mainframe and pc applications. Calibration of a hopkinson bar with a transfer standard ios.
The modern shpb system is widely used in the laboratory studies on stress waves in various types of solids such as metals, rocks, concrete, and so on. Use ape softwares asset and calibration management software to help your organization meet the needs of the external standards like. Calibration of split hopkinson pressure bar system with special shape striker. Calibration of a hopkinson bar with a transfer standard. The right combination of software will make your calibration lab better and more efficient. Highspeed data acquisition in strain measurement and dynamic material testing applications dynamic material testing requires highspeed data acquisition daq and sensors with enough bandwidth to capture these dynamic impulses. Proceedings of the institution of mechanical engineers 211c. Youngs modulus is a material constant that is a measure for. These files will be introduced to a post processing program. Kalibro is an open source free software to manage devices and tools for calibration and maintenance records. The hopkinson bar technique is named after bertram hopkinson who. A correction of bar punching by the specimen is available. The use of the split hopkinson pressure bar techniques in high strain rate materials testing. British electrical engineer bertram hopkinson first suggested.
The hopkinson pressure bar was first suggested by bertram hopkinson in 1914 as a way to measure stress pulse propagation in a metal bar. Unlike the indirect tensiletesting systems available on the market, our shtbs offer direct access to the samplewhich may therefore be observed highspeed cameras, dic, etc. Shpb calibration manual and sample test compression. Calibrating the stresstime curve of a combined finite.
Simcos cerdaac software automates all aspects of the calibration process. Before the test, the calibration of lgg system should be conducted under both. A series of fem simulations of shpb test were used in designing of split hopkinson pressure bar equipment and its dedicated software, developed in impact laboratory, a facility of military technical academy. By kevin young a thesis submitted to the faculty of graduate studies through the department of mechanical. The use of the split hopkinson pressure bar techniques in.
Calibration barcoding is easy with procalv5 and the bar code scanner. Spray paint background matt black, attach matt white measuring marks. Abstractthe use of the split hopkinson pressure bar shpb. It is designed to reduce workload, improve efficiency, and provide the essential platform for companies looking to create and sustain an effective calibration program. To achieve a high strain rate, the split hopkinson pressure bar shpb technique has proven. The use of a beryllium hopkinson bar to characterize inaxis. This case study demonstrates the testing and calibration of a polycarbonate material at a high strain rate of sec1. Maintain certification to several quality and regulatory standards e. Sep 28, 2016 contactless measurement with extensometer 200xr during a material test on the split hopkinson bar. Splithopkinson bars for direct tensile testing shtb an innovation by thiot ingenierie. Polyumod, mcalibration software veryst engineering. Rels 15 years of experience in designing, building and optimizing splithopkinson pressure bar shpb kolsky bar testing systems and techniques has put rel at the forefront of this expanding testing area. Dic highspeed dantec dynamics precision measurement. Kalibro is an open source free software to manage devices and.
Hopkinson pressure bar apparatus tailored for testing soft materials such as foams, elastomers, etc. Evolution of specimen strain rate in split hopkinson bar. Finite elements method in split hopkinson pressure bar developing process rotariu. The use of a beryllium hopkinson bar to characterize in. Calibration is performed by comparing the wave speed of the initial pulse.
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