Download or read book On the Accuracy of Measurement and Calibration of Load Signal in the Instrumented Charpy Impact Test written by H. Toda and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant variation in measured load of an instrumented Charpy impact test is observed if specimen materials or sizes are changed from the standard specimen. Load calibration factors for different materials and sizes of specimens are evaluated by means of both experiments and finite element analysis. Elastic finite element analysis shows that the strain fields in the instrumented striker in contact with different materials and sizes of specimens are not exactly the same as those for the standard specimen. As a result of experiment and analysis, the decrease in stiffness or size of specimens results in a decrease in the calibration factor. Those are attributable to strain localization near the region in which the strain gage is attached. Therefore, the measured load for low-stiffness materials or miniaturized specimens is overestimated when the decrease of calibration factor is disregarded. Those results strongly suggest that the system must be calibrated for the different materials and sizes of specimens to obtain accurate toughness data.

Download or read book Pendulum Impact Testing written by T. A. Siewert and published by ASTM International. This book was released on 2000 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book From Charpy to Present Impact Testing written by D. Francois and published by Elsevier. This book was released on 2002-06-18 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Charpy to Present Impact Testing contains 52 peer-reviewed papers selected from those presented at the Charpy Centenary Conference held in Poitiers, France, 2-5 October 2001. The name of Charpy remains associated with impact testing on notched specimens. At a time when many steam engines exploded, engineers were preoccupied with studying the resistance of steels to impact loading. The Charpy test has provided invaluable indications on the impact properties of materials. It revealed the brittle ductile transition of ferritic steels. The Charpy test is able to provide more quantitative results by instrumenting the striker, which allows the evolution of the applied load during the impact to be determined. The Charpy test is of great importance to evaluate the embrittlement of steels by irradiation in nuclear reactors. Progress in computer programming has allowed for a computer model of the test to be developed; a difficult task in view of its dynamic, three dimensional, adiabatic nature. Together with precise observations of the processes of fracture, this opens the possibility of transferring quantitatively the results of Charpy tests to real components. This test has also been extended to materials other than steels, and is also frequently used to test polymeric materials. Thus the Charpy test is a tool of great importance and is still at the root of a number of investigations; this is the reason why it was felt that the centenary of the Charpy test had to be celebrated. The Société Française de Métallurgie et de Matériaux decided to organise an international conference which was put under the auspices of the European Society for the Integrity of Structures (ESIS). This Charpy Centenary Conference (CCC 2001) was held in Poitiers, at Futuroscope in October 2001. More than 150 participants from 17 countries took part in the discussions and about one hundred presentations were given. An exhibition of equipment showed, not only present day testing machines, but also one of the first Charpy pendulums, brought all the way from Imperial College in London. From Charpy to Present Impact Testing puts together a number of significant contributions. They are classified into 6 headings: •Keynote lectures,•Micromechanisms,•Polymers,•Testing procedures,•Applications,•Modelling.

Download or read book Progress in Materials Science and Engineering written by Carlos Brebbia and published by Springer. This book was released on 2018-05-07 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances made in materials science and engineering within Russian academia, particularly groups working in the Ural Federal University District. Topics explored in this volume include structure formation analysis of complicated alloys, non-ferrous metals metallurgy, composite composed materials science, and high-pressure treatment of metals and alloys. The finding discussed in this volume are to critical to multiple industries including manufacturing, structural materials, oil and gas, coatings, and metal fabrication.

Download or read book Direct Measurement of Displacement in Instrumented Charpy Impact Testing for Structural Integrity Assessment written by JP. Tronskar and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research aims to develop a method for the direct measurement of load-line displacement during instrumented Charpy impact tests. The method involves direct measurement of the load-line displacement using a laser interferometer in addition to the load-line displacement derived from the load signal by double integration according to standard procedures. The ISO striker edge is instrumented with a piezoelectric sensor and the system is calibrated in situ in the impact tester as recommended by ISO 14556:2000 Steel Charpy V-notch Pendulum Impact Test?Instrumented Test Method, using a 0.5% accuracy reference load cell and a hydraulic jack system.

Download or read book Impact Engineering and Application written by Akira Chiba and published by Elsevier Science & Technology. This book was released on 2001 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: These Proceedings contain the papers presented at the 4th International Symposium on Impact Engineering, held in Kumamoto, Japan, on 16-18 July 2001. The primary objective of the international series of Impact Engineering is to provide a forum for the presentation of recent progress in Impact Engineering and its related fields, both in terms of fundamental research and industrial application including automotive and aerospace engineering. This volume includes more than 150 papers presented at the Symposium which covers the latest updated research results in various series such as "testing methods and behavior of materials at high strain rates", "dynamic deformation and fracture under impact" and "explosion, shock wave and their applications" and others. This volume will serve as memoirs to these efforts for the scientists and engineers who are working in the field of mechanics and materials and others.

Download or read book Instrumented Impacted Testing written by T. S. DeSisto and published by ASTM International. This book was released on 1974 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1976 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Load Time Attenuation During Instrumented Charpy Impact Testing written by HJ. Rack and published by . This book was released on 1976 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The uses and limitations of procedures designed to characterize and correct for load-time attenuation occurring during dynamic impact testing are described. The importance of wave form, time to maximum load, and load decay time are considered. It is shown that, within certain bounds, wave form attenuation calibration procedures can be used as a means of correcting data which contains excess filtering.

Download or read book Experimental Mechanics written by I. M. Allison and published by Taylor & Francis US. This book was released on 1998 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Instrumented Impact Testing Using a Hopkinson Bar Apparatus written by T. Nicholas and published by . This book was released on 1975 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique for conducting instrumented Charpy impact tests using a Hopkinson bar is presented. Data for three grades of beryllium covering a range in impact velocities from 20 to 200 in/sec (.5 to 5 mm/s) are obtained in the form of load-deflection curves from which maximum load, maximum deflection, and total energy are obtained. Results show good agreement with data on identical materials obtained from an instrumented impact test at 54 in/sec (1.37 m/s) and from a standard Charpy impact machine at 135 in/sec (3.43 m/s). The advantages and limitations of the Hopkinson bar apparatus are discussed.

Download or read book Journal of Testing and Evaluation written by and published by . This book was released on 1976 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Charpy Impact Test written by John M. Holt and published by ASTM International. This book was released on 1990 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Evaluation of a Verification System for Force Measurement Using Instrumented Impact Testing Machines written by TJ. Mackin and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of controlled impact experiments using a charpy pendulum were conducted to address the possibility of dynamic verification and calibration of instrumented tups. The methodology involved striking an instrumented pendulum tup against a rigidly fixtured transducer. The guiding principal is as follows: If a NIST traceable dynamic load cell is impacted by a service load cell, a comparison of the signals can be used to verify the performance of the service load cell. In this fashion, tups can be verified and calibrated electronically, without resorting to the use of standard test specimens. A relatively compliant Nylon bumper was placed between the pendulum tup and the fixed load cells to dampen the excitation of high frequencies during the impact event. During each impact, load-time signals measured by both the pendulum and fixtured tups were recorded, compared and Fourier analyzed. Results of the Fourier analysis justified a simple two-mass-two-spring model of the impact behavior. Results of the experiments are rationalized using the mass-spring model, and present guidelines for designing a verification system for both pendulum and drop-weight testing machines.

Download or read book China Standard GB T 229 2007 Metallic Materials Charpy pendulum impact test method ISO 148 1 2006 Metallic materials Charpy pendulum impact test method Part 1 Test method MOD written by www.1clicktong.com and published by Risk Management 1 Click Tong. This book was released on 2020-10-14 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This standard regulates measuring method of absorbing energy of metallic materials in Charpy Impact Test( V-shape and U-shape Notch Sample). This standard doesn’t include instrumentation impact test method and this part content is regulated in GB/T 19748-2005 Metallic Materials Instrumentation Charpy Impact Test Method.

Download or read book Instrumented Impact Testing of Subsize Charpy V Notch Specimens written by JF. Kalthoff and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The instrumented impact test with Charpy specimens of subsize geometry is discussed in relation to equivalent standard procedures for performing the test with specimens of regular size. Subsize specimens because of their smaller dimensions imply smaller load values and higher frequencies of the force oscillations. These differences in the behaviour require special high sensitivity striker tups, force measuring chains of high upper frequency bounds, and knowledge of the actual Hooke's line for determining the yield force Fgy. Practical recommendations are given and procedures are outlined on how these requirements can be met and how the evaluations can be performed. The applicability of the presented measuring and evaluation procedures and the validity and the accuracy of the obtained data is demonstrated by experimental results.

Download or read book Dynamic Force Measurement written by Christopher N. McCowan and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: