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Author : H. Couque
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (764 download)
Download or read book A Novel Technique for Determining Dynamic Fracture Toughness in Sub-sized Specimens written by H. Couque and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Man
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (81 download)
Download or read book Innovative Method of Measuring Dynamic Fracture Toughness written by J. Man and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : DF. Cannon
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)
Download or read book The Development of Standard Methods for Determining the Dynamic Fracture Toughness of Metallic Materials written by DF. Cannon and published by . This book was released on 1992 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simple, reliable, and repeatable method has been developed for determining dynamic plane-strain fracture toughness using an on-specimen strain gage. This extends the range of the British Standard Method for Determination of the Dynamic Fracture Toughness of Metallic Materials (BS 6729) to include measurement at impact testing rates. Dynamic finite element computing was used to optimize the position of the gage on the specimen. In tests at low loading rates on Charpy specimens, good agreement was found between toughness values calculated from the applied load and the calibrated gage, and with those measured by the shadow optic caustic technique. At higher rates, several gage types and two adhesives were compared. A satisfactory method was developed for performing tests at high and low temperatures. The technique was applied to larger bend specimens of two steels, and a test program was conducted at seven laboratories to assess the influence of testing machine and instrumentation variables. From the results, a standard calibration and test procedure has been developed.
Author : K. Ravi-Chandar
Publisher : Elsevier
ISBN 13 : 0080472559
Total Pages : 265 pages
Book Rating : 4.0/5 (84 download)
Download or read book Dynamic Fracture written by K. Ravi-Chandar and published by Elsevier. This book was released on 2004-10-16 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic fracture in solids has attracted much attention for over a century from engineers as well as physicists due both to its technological interest and to inherent scientific curiosity. Rapidly applied loads are encountered in a number of technical applications. In some cases such loads might be applied deliberately, as for example in problems of blasting, mining, and comminution or fragmentation; in other cases, such dynamic loads might arise from accidental conditions. Regardless of the origin of the rapid loading, it is necessary to understand the mechanisms and mechanics of fracture under dynamic loading conditions in order to design suitable procedures for assessing the susceptibility to fracture. Quite apart from its repercussions in the area of structural integrity, fundamental scientific curiosity has continued to play a large role in engendering interest in dynamic fracture problems In-depth coverage of the mechanics, experimental methods, practical applications Summary of material response of different materials Discussion of unresolved issues in dynamic fracture
Author : S. Mall
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (227 download)
Download or read book Dynamic Fracture Analysis of Notched Bend Specimens written by S. Mall and published by . This book was released on 1978 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dynamic finite element code was used to determine dynamic initiation fracture toughness, K sub Id. in 25.4 mm (1 in.) thick notched bend specimens of A533 B steel and a 15.9 mm (5/8 in.) thick dynamic tear (DT) specimen of 6061 aluminum alloy. These specimen types can reflect varying dynamic fracture response due to differences in test temperature, specimen geometry and material as well as notch tip sharpness. Measured load-time histories were applied to the tup as modeled by finite elements and the dynamic stress intensity factor was computed by a calibrated COD procedure. Dynamic stress intensity factors were also computed by the ASTM E-399 procedure using a load based on local dynamic strain measurements and a static K-calibration. Reasonable agreements between measured and computed dynamic strains in the vicinity of the crack tip verified the accuracy of the dynamic finite element model. The attendant agreement between measured versus computed time-varying dynamic stress intensity factors also verified, for the first time, the applicability of the ASTM E-399 procedure for computing dynamic initiation fracture toughness, K sub Id on the basis of local dynamic strain measurements. (Author).
Author : WN. Sharpe
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (125 download)
Download or read book Dynamic Fracture Toughness Measurements on Small Charpy Specimens{97}A Preliminary Study written by WN. Sharpe and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique for measuring dynamic fracture toughness on small specimens is described and preliminary data are presented. Dynamic crack tip opening displacements (CTODs) are measured with laser interferometry over times as short as 10 ?s. The measured displacement is converted to stress intensity values via the equations of linear elastic fracture mechanics and the peak value obtained is taken as the dynamic fracture toughness.
Author : Jason M. Shapiro
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (826 download)
Download or read book An Experimental Method for Determination of Dynamic Fracture Toughness written by Jason M. Shapiro and published by . This book was released on 1987 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. L. Server
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Use of Pre-Cracked Charpy Specimens to Determine Dynamic Fracture Toughness written by W. L. Server and published by . This book was released on 1971 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of an instrumented impact hammer on pre-cracked Charpy V specimens has led to an inexpensive method for determining the dynamic fracture toughness, K sub Id. Measurements were made on A-533 steel over a range of temperature ( -125 to + 75F) at a loading rate K clot approximately equal to 1,000,000 ksi (in. to the 1/2 power)/sec. The data were found to be in excellent agreement with those obtained by other workers on much larger specimens. Analysis of the data leads to a new method for estimating the NDT temperature, which may be of practical value in nuclear reactor surveillance programs. (Author).
Author : GB. Lenkey
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (125 download)
Download or read book On the Determination of Dynamic Fracture Toughness Properties by Instrumented Impact Testing written by GB. Lenkey and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Peng Ying
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (125 download)
Download or read book Testing Method of Rock Dynamic Fracture Toughness Using Large Single Cleavage Semicircle Compression Specimens written by Peng Ying and published by . This book was released on 2020 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic fracture toughness is an important material parameter that can be applied in the prediction of a cracked structure's stability under dynamic loads. Large single cleavage semicircle compression specimens were used to evaluate rock dynamic fracture toughness by a drop weight impact test system. Crack propagation gauges, which consist of a group of fine wires, were glued along a crack propagation path to measure crack propagation speed and propagation time. The finite difference code Autodyn (ANSYS, Canonsburg, PA) was used to simulate the crack propagation path and to analyze the crack propagation mechanism. A group of gauge points were set up along the propagation path, and the stresses at these points were calculated and analyzed. The dynamic stress intensity factors were calculated by numerical models using the finite element code ABAQUS (Dassault Systmes, Vlizy-Villacoublay, France). Finally, the dynamic fracture toughness, including initiation toughness and propagation toughness, was determined according to crack propagation speed and propagation time. The results show that crack propagation speed varies during dynamic propagation under impact loads, and the propagation toughness is inversely proportional to the crack propagation speed. In addition, the phenomena of cracks temporarily arresting could be observed during crack dynamic propagations.
Author : S. Mall
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (125 download)
Download or read book Dynamic Fracture Analysis of Notched Bend Specimens written by S. Mall and published by . This book was released on 1980 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dynamic finite-element code was used to determine dynamic initiation fracture toughness, KId, in 25.4-mm-thick (1 in.) notched bend specimens of A533B steel and a 15.9-mm-thick (5/8 in.) dynamic tear specimen of 6061 aluminum alloy. These specimen types can reflect varying dynamic fracture response due to differences in test temperature, specimen geometry, and material as well as notch tip sharpness. Measured load-time histories were applied to the tup as modeled by finite elements, and the dynamic stress-intensity factor was computed by a calibrated crack opening displacement procedure. Dynamic stress-intensity factors were also computed by the ASTM Test for Plane-Strain Fracture Toughness of Metallic Materials (E 399-74) using a load based on local dynamic strain measurements and a static K calibration.
Author : Rauno Rintamaa
Publisher :
ISBN 13 : 9789513842581
Total Pages : 145 pages
Book Rating : 4.8/5 (425 download)
Download or read book Single Specimen Fracture Toughness Determination Procedure Using Instrumented Impact Test written by Rauno Rintamaa and published by . This book was released on 1993 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : G. Carcagno
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)
Download or read book Evaluation of Dynamic Fracture Toughness Using the Normalization Method written by G. Carcagno and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a simple technique to determine dynamic J-R curves from a single, precracked Charpy-type specimen by means of an instrumented Charpy testing machine. This technique is based on the normalization method proposed originally by Landes and Herrera. This method eliminates the need for crack length monitoring that makes it particularly suitable under dynamic loading conditions.
Author : William Leon Server
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (227 download)
Download or read book Dynamic Fracture Toughness Determined from Instrumented Pre-Cracked Charpy Tests written by William Leon Server and published by . This book was released on 1972 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of an instrumented impact hammer on pre-cracked Charpy V-notch specimens led to a reliable and inexpensive method for determining dynamic fracture toughness. Measurements were made on A-533, Grade B, Class 1 steel from -125F to +75F. The data were found to be in excellent agreement with those obtained by other workers on much larger specimens. Similar tests were run with standard Charpy V-notch specimens to determine dynamic tensile yield strength values. A comparison of the dynamic yield and toughness values suggests a meaningful technique for estimating the NDT temperature, which should be of practical value in nuclear reactor surveillance programs. (Author).
Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580153075
Total Pages : 34 pages
Book Rating : 4.1/5 (53 download)
Download or read book Method for Determination of the Dynamic Fracture Toughness of Metallic Materials written by British Standards Institute Staff and published by . This book was released on 1987-01-01 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metals, Alloys, Crack-opening displacement tests, Plane strain fracture toughness tests, Fatigue testing, Dynamic testing, Testing conditions, Test specimens, Dimensions, Test equipment, Performance testing, Data analysis, Mathematical calculations, Frequency response
Author : Junchen Zhang
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book Two Methods for Determining Dynamic Mode-II Fracture Toughness of Rocks written by Junchen Zhang and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mode-II (shear) fracture toughness, KIIC describes the resistance of rock to fracture propagation under shear loading. Some methods have been proposed to measure KIIC of rocks under static loading condition, but a few methods are available to test dynamic KIIC. This thesis work describes two experimental methods for the determination of, KIIC. Two methods, named Punch-Through Shear (PTS) method and Short Core in Compression (SCC) method are addressed in this thesis. A split Hopkinson pressure bar (SHPB) system is used to provide a dynamic load to the specimen and measure the dynamic property. The stress intensity factor (SIF) is calculated based on the peak load through Finite Element Modelling (FEM). The influence of specimen geometry and confining pressure on the dynamic KIIC is also discussed. The results obtain though PTS and SCC are compared with each other, and both results show that KIIC Increases with the loading rate.
Author : TJ. Koppenaal
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (125 download)
Download or read book Dynamic Fracture Toughness Measurements of High-Strength Steels Using Precracked Charpy Specimens written by TJ. Koppenaal and published by . This book was released on 1974 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic fracture toughness, KId, was measured in a number of ferrous alloys using precracked Charpy specimens and an instrumented impact machine. The alloys investigated included quenched and tempered steels (H-11, D6AC, and 4340), 18Ni maraging steels (grades 200, 250, and 300) and a high-temperature, stainless maraging steel (Pyromet X-15). Standard Charpy specimens were precracked in fatigue and tested at either 72°F (22°C) or -65°F (-54°C). Values of KId, were determined as a function of yield strength and microstructure, and correlations were established between KId and both the energy to initiate fracture, Wm/A, and the total energy of fracture, W/A. The instrumented, precracked Charpy test is shown to be a convenient method of determining relative fracture toughness; under proper conditions this test procedure can be used to determine the dynamic planestrain fracture toughness.
