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Author : Lei Fang
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.:/5 (826 download)
Download or read book Dynamic Fracture Initiation in a Three Point Bend Tool Steel Specimen written by Lei Fang and published by . This book was released on 1988 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alan T. Zehnder
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (227 download)
Download or read book Dynamic Fracture Initiation and Propagation in 4340 Steel Under Impact Loading written by Alan T. Zehnder and published by . This book was released on 1986 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic fracture initiation and propagation in 4340 steel was investigated experimentally using the optical method of reflected caustics combined with high speed photography. A new crack propagation testing configuration consisting of a three point bend specimen loaded in a drop weight tower was used. It was found that prior to crack initiation the stress intensity factor time record calculated using the dynamic tip load and a static formula disagrees with the actual stress intensity factor measured by caustics. During crack propagation, the crack tip velocity and stress intensity factor time records varied smoothly and repeatably allowing for a straightforward interpretation of the data. The experiments show that for the particular heat treatment of 4340 steel used, the dynamic fracture propagation toughness depends on crack tip velocity through a relation that is a material property. Keywords: Dynamic fracture initiation, Dynamic crack propagation, Caustics, 4340 steel, High-speed camera, Stress-intensity factor, and Three point bend specimen.
Author : T. Nakamura
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (227 download)
Download or read book Three-Dimensional Transient Analysis of a Dynamically Loaded Three-Point-Bend Ductile Fracture Specimen written by T. Nakamura and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A transient three dimensional full field analysis of a three point bend fracture specimen dynamically loaded into the fully yielded plastic state has been carried out. The specimen is rapidly loaded by means of a concentrated transverse force applied at midspan on the uncracked surface of the specimen. The material is ductile and fracture initiation occurs after substantial plastic deformation has developed in the uncracked ligament. Furthermore it is supposed that the crack tip conditions are such that the J integral may be adopted as a characterizing parameter. An expression is derived for the local energy flux appropriate to a three dimensional crack front. Based on this fundamental crack tip flux integral, a domain integral representation for J, suited for the finite element method is obtained. Using the domain integral, accurate pointwise/local values of J along a three dimensional crack front can be extracted from numerically determined field quantities. Transient loading, geometry and plastic deformation on the variation of J along the crack front are examined. The present study determines conditions under which the value of J at initiation may be inferred from quantities that are directly measurable in a dynamic fracture experiment. Earlier a transition time was introduced to provide a practical bound on the time range over which conditions of J dominance prevailed and the deep crack formula was applicable under transient loadings. The transition time concept is further examined. The full field solutions allow comment on the suitability of proposed surface locations for measurement of moment deep crack formula for J, Implications for fracture testing of tough materials at relatively high loading rates are discussed.
Author : Thomas A. Cruse
Publisher : ASTM International
ISBN 13 : 0803109725
Total Pages : 936 pages
Book Rating : 4.8/5 (31 download)
Download or read book Fracture Mechanics, Nineteenth Symposium written by Thomas A. Cruse and published by ASTM International. This book was released on 1988 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : 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 : WL. Server
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (125 download)
Download or read book Impact Three-Point Bend Testing for Notched and Precracked Specimens written by WL. Server and published by . This book was released on 1978 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Testing and data analysis procedures developed from a recently completed fracture toughness testing program on ferritic nuclear pressure vessel steels are presented. These procedures describe the measurement of dynamic fracture toughness at stress intensification rates near 105 MPa?m/s using instrumented impact testing of three-point bend specimens. These procedures have been submitted to several ASTM task groups, and it is hoped that these guidelines will be incorporated into current and future interlaboratory activities eventually leading to a standard method for testing.
Author :
Publisher :
ISBN 13 :
Total Pages : 464 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : EM. Hackett
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (125 download)
Download or read book Measurement of Dynamic Fracture Toughness of Ductile Materials written by EM. Hackett and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this study was to demonstrate the applicability of a J-based approach to fracture characterization of ductile alloys subjected to dynamic loading. Three-point-bend [SE(B)] fracture specimens of a high-strength steel were subjected to impact loading in a drop tower, and appropriate strains and displacements were measured to allow estimation of J. A finite element analysis of these experiments was conducted to evaluate the applicability of a J-based fracture characterization scheme and to provide guidance for the experimental measurements. The concept of a transition time was introduced to provide an estimate of the time during which the controlling crack-tip field [Hutchinson-Rice-Rosengren (HRR) field] stabilizes. The paper demonstrates that for fracture times greater than the transition time, J can be accurately evaluated by the quasi-static deep-crack formulation. For the case of the steel SE(B) specimen geometry used for this study, the transition time was approximately 300 s. The finite-element analysis indicated that the net moment carried by the remaining ligament of the specimen could be evaluated by measurements of the flexural and stresses at the quarter-span position on the SE(B) specimen. This was verified experimentally in drop tower experiments utilizing strain gages at the quarter-span position. These results were found to compare well with a load estimation scheme based on a full bridge of strain gages attached to the tension and compression surfaces of the SE(B) specimen. The load accuracy obtained using the full bridge was also found to be insensitive to crack extension and plasticity at the crack tip. Methods of determining the crack initiation point in these dynamic experiments were evaluated. It was found that the double capacitance crack-opening displacement (COD) gage used in the experiments provides an accurate estimate of the crack initiation point.
Author : Alan T. Zehnder
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (227 download)
Download or read book Three Dimensional Effects Near a Crack Tip in a Ductile Three Point Bend Specimen. Part 2. An Experimental Investigation Using Interferometry and Caustics written by Alan T. Zehnder and published by . This book was released on 1988 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation is undertaken to assess three-dimensional effects near a crack front in a ductile three-point bend specimen. The possibility of using the optical method of caustics for the measurement of the J integral in the presence of large scale yielding and three dimensional fields is also investigated. Experiments using the optical methods of caustics by reflection and Twyman-Green interferometry are performed simultaneously on either side of the test specimen. The load and load-point displacement are also measured. The experimental results are compared with very good agreement to the results of a finite element simulation of the experiment. The caustics experiments are used to obtain a calibration relation between the value of the J integral and the caustic diameter for load levels up to fracture initiation. It is proposed that such a calibration be used in dynamic fracture initiation experiments for the measurement of the time history of the dynamic J -integral. (mjm).
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (783 download)
Download or read book Ceremonie reglement gegen fremde gesandten berathen unter den drey vororten und nach erfolgter zustimmung Zürich's und Luzern's in das eidgenossische protocoll unter dem 24ten dezember 1818 eingetragen written by and published by . This book was released on with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Society for Experimental Mechanics (U.S.)
Publisher :
ISBN 13 :
Total Pages : 500 pages
Book Rating : 4.:/5 (318 download)
Download or read book Proceedings of the Society for Experimental Mechanics written by Society for Experimental Mechanics (U.S.) and published by . This book was released on 1989 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : Thomas Michael Breunig
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (89 download)
Download or read book Dynamic Fracture Toughness Characteristics of D2 Tool Steel written by Thomas Michael Breunig and published by . This book was released on 1984 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : GC. Angelino
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (125 download)
Download or read book Influence of the Geometry on Unstable Crack Extension and Determination of Dynamic Fracture Mechanics Parameters written by GC. Angelino and published by . This book was released on 1977 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic fracture toughness of the high-strength steel VCN-100 (UNI 38 NiCrMo4) is derived from tests on TPB 9 (three-point-bend) specimens. A wide range of crack velocities was obtained by changing the ER (energy ratio) of the specimen at crack instability; the crack velocity was evaluated from load versus time records during crack propagation. The results show a dependence of KID on crack velocity in good agreement with literature data.
Author : J. Džugan
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (125 download)
Download or read book Crack Initiation Determination for Three-Point-Bend Specimens written by J. Džugan and published by . This book was released on 2007 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper deals with the determination of crack initiation for three-point-bend specimens during fracture toughness testing of materials in the upper transition and upper shelf region. In the presented study various published methods such as the Double Clip Gage Method, the Strain Near to Crack Tip Measurement method, the Double Displacement Method, the Compliance Changing Rate Method, and the Stretch Width Zone measurement were applied together with the methods using the crack extension versus crack mouth opening displacement and force versus displacement for the crack initiation determination. Blunting line based evaluation were also performed and all results were compared. The investigation was carried out on five different steels.
Author :
Publisher :
ISBN 13 :
Total Pages : 1076 pages
Book Rating : 4.E/5 ( download)
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
