On the Determination of Dynamic Fracture Toughness Properties by Instrumented Impact Testing PDF Download
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Author: GB. Lenkey
Publisher:
ISBN:
Category : Dynamic fracture toughness
Languages : en
Pages : 16
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Book Description
In the engineering practice it is of importance to know the effect of loading rate on the material behaviour, e.g., on the fracture mechanics properties. One of the most widely used testing techniques for determining these properties is the instrumented impact test. Depending on the material behaviour under a given loading condition, different fracture mechanics parameters should be determined. Most of the evaluation procedures of these parameters are still not standardised for higher loading rates. So the aim of the present work was to investigate the applicability of different methods for determining dynamic fracture toughness properties. Instrumented impact experiments combining with magnetic emission measurement have been performed on pre-cracked Charpy-V specimens of E420 C and QStE 690 TM high strength steels. Critical values of stress intensity factor (KId, KJi) related to the initiation of the fracture at different temperatures have been determined Using different methods depending on the type of the fracture.
Author: GB. Lenkey
Publisher:
ISBN:
Category : Dynamic fracture toughness
Languages : en
Pages : 16
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Book Description
In the engineering practice it is of importance to know the effect of loading rate on the material behaviour, e.g., on the fracture mechanics properties. One of the most widely used testing techniques for determining these properties is the instrumented impact test. Depending on the material behaviour under a given loading condition, different fracture mechanics parameters should be determined. Most of the evaluation procedures of these parameters are still not standardised for higher loading rates. So the aim of the present work was to investigate the applicability of different methods for determining dynamic fracture toughness properties. Instrumented impact experiments combining with magnetic emission measurement have been performed on pre-cracked Charpy-V specimens of E420 C and QStE 690 TM high strength steels. Critical values of stress intensity factor (KId, KJi) related to the initiation of the fracture at different temperatures have been determined Using different methods depending on the type of the fracture.
Author: California. Office of Transportation Laboratory
Publisher:
ISBN:
Category : Steel
Languages : en
Pages :
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Book Description
Author: CH. Curll
Publisher:
ISBN:
Category : Alloy steels
Languages : en
Pages : 11
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Book Description
Instrumented impact test systems have been designed for determination of dynamic fracture toughness properties and utilized for the study of impact properties of materials in many laboratories. Since equipment varies from laboratory to laboratory, variations due to the equipment or instrumentation or both should be examined. This investigation studies variations in dynamic fracture toughness due to the test machine or calibration methods or both. The parameters chosen for the study are the peak load and the fracture energy. Two materials, AISI-4340 steel alloy and 6061-T6 aluminum alloy, were selected to evaluate the variation of these parameters.
Author: Welding Institute
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 364
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Book Description
Author: D. Simon Shong
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 264
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Book Description
Author: E. van Walle
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 272
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Book Description
Expert discussion and novel solutions for dynamic testing and analysis Evaluating Materials Properties by Dynamic Testing is a collection of fifteen papers incorporating a concentrated body of knowledge to provide a single-volume reference for the field. Presented by the ESIS, this book covers standard methods of dynamic testing and analysis of test data. The work provides a variety of perspectives and covers a broad range of applications in engineering and materials science, offering novel solutions to specific problems. Peer-reviewed by international experts, this book is an authoritative, high-utility reference for anyone in the field.
Author: D. Francois
Publisher: Elsevier
ISBN: 008052897X
Category : Technology & Engineering
Languages : en
Pages : 497
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Book Description
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.
Author: T. A. Siewert
Publisher: ASTM International
ISBN: 0803128649
Category : Dynamic testing
Languages : en
Pages : 402
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Book Description
Author: Rauno Rintamaa
Publisher:
ISBN: 9789513842581
Category : Fracture mechanics
Languages : en
Pages : 145
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Book Description
A new single specimen test method and testing facility for evaluating dynamic fracture toughness has been develeoped. The method is based on the application of a new pendulum type instrumented impact tester equipped with an optical crack mouth opening displacement extensometer. The fracture toughness measurement technique uses the double displacement ratio method, which is based on the assumption that the specimen is deformed as two rigid arms that rotate around an apparent centre of rotation. This apparent centre moves as the crack grows, and the ratio of COD versus specimen displacement changes. As a consequence the onset of ductile crack initiation can be detected on the load-displacement curve. Thus an energy-based fracture toughness can be calculated.
Author: T. Nishioka
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
Numerical simulations of crack-propagation histories in four cases of dynamic tear test experiments on 4340 steel are performed. The influence of the loss of contact of the specimen at various times with either the supports or the tup or both is critically examined. In each case, the variation of the dynamic K-factor, for the simulated crack-propagation history, is directly computed. The results are discussed in the light of current controversies surrounding the dynamic fracture toughness properties governing crack-propagation under impact loading. It is concluded that these controversies may not be fully warranted. (Author).
