Download or read book Certified Miniaturized Charpy Specimens for the Indirect Verification of Small Size Impact Machines Contribution of the National Institute of Standards and Technology NIST an Agency of the U S Government Not Subject to Copyright in the United States written by Enrico Lucon and published by . This book was released on 2013 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small specimen test techniques are becoming ever more popular as the need increases to characterize mechanical properties by the use of the smallest possible amount of material, because of various restrictions on material availability, irradiation, testing space, and other factors. The National Institute of Standards and Technology (NIST) is currently developing certified miniaturized Charpy V-notch (MCVN) specimens for the indirect verification of small-scale impact testing machines. The same materials used for NIST standard verification specimens are being evaluated at three energy levels (low, high, and super-high). Two specimen types are being investigated, denominated KLST (from the German Kleinstprobe, or "small specimen") and RHS (reduced half-size). Several instrumented impact tests on miniaturized KLST and RHS specimens of low, high, and super-high energy have been performed and analyzed. The variability of MCVN data has been compared to that of full-size Charpy data from the same lots of test specimens. Although this can be considered as just the preliminary phase of this project, the results indicate that MCVN verification specimens can be used for the indirect verification of small-scale instrumented impact testers, both in terms of absorbed energy and maximum force.
Download or read book Certified KLST Miniaturized Charpy Specimens for the Indirect Verification of Small Scale Impact Machines written by J. D. Splett and published by . This book was released on 2015 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small specimen test techniques are becoming ever more popular as the need increases to characterize mechanical properties by use of the smallest possible amount of material, because of various restrictions on material availability, irradiation, testing space, and other factors. The National Institute of Standards and Technology (NIST) recently qualified reference miniaturized Charpy V-notch (MCVN) specimens for the indirect verification of small-scale impact testing machines (with capacity in the range 15 J to 50 J and impact velocity around 3.8 m/s). The same materials used for NIST standard verification specimens were evaluated at three energy levels (low, high, and super-high). The miniaturized specimen type investigated is denominated KLST (from the German Kleinstprobe, or "small specimen"). In the first phase of the qualification activity, several instrumented impact tests on miniaturized KLST specimens of low, high, and super-high energy were performed and analyzed at NIST. In this part of the study, which was published elsewhere [Lucon, E., "Certified Miniaturized Charpy Specimens for the Indirect Verification of Small-Size Impact Machines," Mater. Perform. Character., Volume 2, No. 1, 2013], the variability of MCVN data was compared to that of full-size Charpy data from the same lot of specimens. Additional aspects were also investigated, such as the influence of shear lip symmetry and specimen full or partial fracture on absorbed energy, and the correlation between miniaturized and full-size Charpy data. In the second phase of the qualification activity, certified values of absorbed energy and maximum force were established for each energy level by means of an international round robin, which involved nine highly qualified laboratories. The results of this round robin, and the outcome of the statistical analyses performed in accordance with ASTM E691-13 (ASTM E691-13: Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method, ASTM International, West Conshohocken, PA) and ISO 5725-2 [ISO 5725-2, 1994, "Accuracy (Trueness and Precision) of Measurement Methods and Results," International Organization for Standardization, Geneva, Switzerland], are presented in this paper. Complete details are provided by NIST [Lucon, E., McCowan, C., Santoyo, R., and Splett, J., "Standard Reference Materials--Certification Report for SRM 2216, 2218, 2219: KLST (Miniaturized) Charpy V-Notch Impact Specimens," NIST Special Publication 260-180, National Institute of Standards and Technology, Gaithersburg, MD, 2013], which accompanies the certified KLST.
Download or read book Miniaturized Charpy Specimens for the Indirect Verification of Small scale Charpy Machines written by Enrico Lucon and published by . This book was released on 2012 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small specimen test techniques become ever more popular as the need increases to characterize mechanical properties by use of the smallest possible amount of material, due to various restrictions on material availability, irradiation, testing space, and other factors. NIST is currently developing reference miniaturized Charpy V-notch (MCVN) specimens for the indirect verification of small-scale impact testing machines. The same materials used for NIST standard verification specimens are being evaluated at three energy levels (low, high and super-high). Two specimen types are being investigated, denominated KLST (from the German Kleinstprobe, or "small specimen") and RHS (reduced half-size). Several instrumented impact tests on miniaturized KLST and RHS specimens of low, high and super-high energy have been performed and analyzed. The variability of MCVN data has been compared to that of full-size Charpy data from the same lot of test specimens. Although this can be considered just the preliminary phase of this project, the results indicate that MCVN verification specimens can be used for the indirect verification of small-scale instrumented impact testers, both in terms of absorbed energy and maximum force. Additional aspects have also been investigated, such as the influence of shear lip symmetry and specimen fracture on absorbed energy and the correlation between miniaturized and full-size Charpy data.
Download or read book Charpy Verification Program written by C. N. MacCowan and published by National Institute of Standards & Technology. This book was released on 2004-04-01 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a compendium of various studies by NIST on Charpy impact test procedure and specimen preparation variables. Includes sections on: Overview and History; Materials and Heat Treatment; Specimen, Machine, and Procedure Effects; and Statistical Evaluations of Charpy Impact Data.
Download or read book Test Temperature Range for NIST Certified Charpy Specimens for Testing at room Temperature written by Enrico Lucon and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NIST Charpy Machine Verification Program is ready to introduce low-energy and high-energy certified specimens that can be tested at room temperature instead of -40 ℗ʻC, thus accommodating the requests of many customers during the past 35 years. An investigation aimed at providing a practical and technically sound definition of "room temperature" (barycentric value and tolerance) was conducted, by examining previously obtained Charpy energy transition curves for different energy levels, as well as by testing certified low-energy and high-energy specimens at 21 ℗ʻC (ambient temperature of the NIST Charpy Lab in Boulder, Colorado) and additional temperatures in the range 21 ℗ʻC ℗ł 5 ℗ʻC. Results have shown that for low-energy specimens, even within a relatively small 10 ℗ʻC range, the influence of test temperature on Charpy absorbed energy can be significant enough to cause "good" machines to fail the requirements of the ASTM E23 standard. Therefore, at this energy level, the allowable test temperature range must be restricted to 21 ℗ʻC ℗ł 1 ℗ʻC. For the other two energy levels (high and super-high), the influence of test temperature is small enough that the allowable temperature range can be expanded to 21 ℗ʻC ℗ł 3 ℗ʻC.
Download or read book A Comparative Analysis of NIST Charpy Machines and Internal Reference Materials written by Enrico Lucon and published by . This book was released on with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the results of a series of comparative analyses which were conducted on the Charpy machines located at NIST in Boulder, Colorado. The analyses were performed both on historical data, collected over a period of more than 20 years, and newly obtained test results from almost 300 instrumented and non-instrumented impact tests on verification specimens of low energy (13 J to 20 J), high energy (88 J to 136 J), and super-high energy (176 J to 244 J). The comparative analyses were completed for the purpose of understanding the limits of calibrating instrumented strikers for use in dynamic test through conventional static calibration procedures. Test results, obtained both in the past and within the current study, show that one of the so-called master machines (used to establish reference values for ASTM verification specimens) delivers consistently lower energy values than the other two master machines in the 15 J - 20 J range. This is suspected to be due to its higher stiffness and hammer design (C-type), which increases its natural frequency of vibration and causes early fracture in a quasi-brittle (low-energy) test. The extremely large number of instrumented Charpy tests performed within this investigation (more than 200) allowed us to assess the reliability of the conventional static calibration procedure for our instrumented strikers, as compared to different approaches for the adjustment/correction of measured force values. Even though these approaches were found beneficial in improving the between-machine consistency, statistically significant differences remained nonetheless. It appears that, in order to reliably calibrate an instrumented striker, forces must be applied at loading rates that are equivalent to those encountered during actual tests (dynamic calibration of instrumented strikers). This should become a clear objective of the NIST Charpy program going forward.
Download or read book Analysis of Charpy Impact Verification Data written by JD. Splett and published by . This book was released on 2006 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indirect verification tests used to verify the performance of Charpy impact machines according to ASTM Standard E23 were evaluated by the National Institute of Standards and Technology (NIST), and the data from these tests are collected in a database. The data include the capacity and the pendulum design of the impact machine, the energy obtained for each specimen tested, the reference energy for the specimen lot tested, and the test date. The principal use of this data is to track the performance of individual impact machines. However, the data also provide an opportunity to evaluate existing and proposed requirements for the indirect verification of Charpy impact machines. The results of more than 16 000 verification tests are used to compare the current verification requirements of ASTM Standard E23 with those of ISO Standard 148-2. Discussions focus on the identification of reasonable, practical, and meaningful verification requirements that might be proposed for use in both documents.
Download or read book Certification Report for Srm 2216 2218 2219 written by Enrico Lucon and published by CreateSpace. This book was released on 2014-06-24 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Certification Report documents the procedures used to develop certified values of maximum force (Fm) and absorbed energy (KV) for miniaturized verification Charpy V-notch impact specimens, at three absorbed energy levels (low, high and super-high).
Download or read book Charpy Verification Program written by C. N. McCowan and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production of Charpy Impact Verification Specimens and Verification of Machine Performance written by N. Hida and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1990, Japan established the industrial standard "Standard Specimens for Charpy Impact Testing Machines" and revised "Charpy Impact Testing Machines". Before establishing these standards, the Iron and Steel Institute of Japan had studied the standardization of the reference test pieces and the reference testing machines. Reference test pieces for two energy levels (30 J and 100 J) are available, with a coefficient of variation within a lot of less than 4%.
Download or read book Determination of the Compliance of NIST Charpy Impact Machines written by Enrico Lucon and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Comparison of Impact Reference Materials 2004 written by C. McCowan and published by . This book was released on 2006 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A three-year horizontal comparison has been completed between national laboratories that certify specimens for the indirect verification of Charpy impact test machines. The participants in this study were the Institute for Reference Materials and Measurements of the European Commission, the National Metrology Institute of Japan (NMIJ), the National Institute of Standards and Technology in the United States, and the Laboratoire National d'Essais in France. The comparison was conducted to evaluate the impact of reference specimens over a three-year period. Sets of certified reference specimens, at low (15 J), medium (30 J), and high energy (100 J) levels were produced and distributed at the start of the study. Specimens were tested approximately every six months on each of the machines in the study. The results of the testing are presented and the stability of the various impact machines and specimens are discussed.
Download or read book Pendulum Impact Machines written by T. A. Siewert and published by ASTM International. This book was released on 1995 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metallic Materials Charpy Pendulum Impact Test Preparation and Characterization of Charpy V Notch Test Pieces for Indirect Verification of Pendulum Impact Machines written by British Standards Institute Staff and published by . This book was released on 2009-02-28 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metals, Charpy impact tests, Impact testing, Test equipment, Verification, Specimen preparation, Test specimens, V-shape, Notches, Pendulums, Dimensions, Testing conditions, Errors, Tolerances (measurement)
Download or read book Standard Test Method for Impact Testing of Miniaturized Charpy V notch Specimens written by and published by . This book was released on 2013 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Test Method for Impact Testing of Miniaturized Charpy V notch Specimens written by American Society for Testing and Materials and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charpy Impact Verification Data 1994 1996 written by CN. McCowan and published by . This book was released on 1999 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a summary of Charpy impact verification test data that were evaluated by the National Institute of Standards and Technology from January 1994 to December 1996. The Charpy impact machines that met the verification requirements of ASTM Test Methods for Notched Bar Impact Testing of Metallic Materials (E 23) are broken down by year and by reference lot. Based on the data, a proposed verification rule that limits the range of the verification set has been examined. We also present the results for determining whether two energies (lower and upper ends of the machine capacity) or three (lower, middle, and upper) are needed to verify the performance of the large-capacity impact machines; currently E 23 requires three energies to be tested.
