Download or read book Determination of Fracture Toughness Characteristics of Small Size Chevron Notched Specimens written by Yevgeny Deryugin and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method is proposed to determine fracture toughness of structural materials according to the test data of non-standard small-size chevron-notched specimens. During the tests, loading diagrams and photographic images of the specimens taken in time intervals are obtained. The crack length is measured in the process of its initiation and propagation. The analytical expressions are obtained being based and derived from the constitutive equations of engineering fracture mechanics to determine the crack-driving force (specific fracture energy) and the stress intensity factor. The method allows us to exclude the periodic unloading of the specimen applied under standard test conditions to determine the change in specimen compliance, which is taken into account in constitutive equations at crack length increase. All necessary calculation parameters are determined according to the experimental data. The method allows us to certify fracture toughness of the material without restrictions regarding the amount of plastic deformation and in front of the crack tip and in the specimen as a whole. The examples are given to calculate the fracture toughness criteria for a number of structural materials characterized by the ability to plastic deformation and by the Young's modulus value.
Download or read book Chevron notch Fracture Test Experience written by Kevin R. Brown and published by ASTM International. This book was released on 1992 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the latest information and experimentation on the fracture-toughness testing of materials using specimens that are chevron notched, a procedure that has been an ASTM standard only since December 1989. The 13 papers were presented at a symposium in Indianapolis, May 1991; they include studies
Download or read book Contact and Fracture Mechanics written by Pranav H. Darji and published by BoD – Books on Demand. This book was released on 2018-05-30 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains two sections: Chapters 1-7 deal with contact mechanics, and Chapters 8-13 deal with fracture mechanics. The different contributions of this book will cover the various advanced topics of research. It provides some needed background with respect to contact mechanics, fracture mechanics and the use of finite element methods in both. All the covered chapters of this book are of a theoretical and applied nature, suitable for the researchers of engineering, physics, applied mathematics and mechanics with an interest in computer simulation of contact and fracture problems.
Download or read book Rock Fracture Toughness Determination with Chevron Notched and Straight Through Notched Three Point Bend Round Bar Specimens written by W. Qizhi and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chevron-notched and straight-through-notched three-point bend round bar specimens were used to test fracture toughness of a Chongqing limestone. Comparable values were obtained from these two kinds of specimens, but the chevron-notched specimens had the merits of easiness for deducing and detecting overloading, less the possibility for deviation of crack growth from notch plane, and a included nonlinear correction factor in fracture toughness calculation. However, there was some size effect for chevron-notched specimens; the test values increased with increment in crack length and diameter.
Download or read book An Investigation on the Method for Determination of Fracture Toughness KIc of Metallic Materials with Chevron Notched Short Rod and Short Bar Specimens written by W. Chizhi and published by . This book was released on 1984 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: By means of an expression proposed by the authors, dimensionless critical crack lengths and stress-intensity factor coefficients for chevron-notched short-rod specimens were calculated based on the straight-through crack assumption. Calculation was also done for chevron-notched short-bar specimens in an extended range including short bar with rectangular cross section. Three configurations of chevron-notched specimens were used to test fracture toughness KIc for eight metallic materials. Some results were compared with values from standard compact tension and three-point bend specimens. Good agreement was obtained when both stable crack extension and a very small plasticity factor were achieved. The role of load-displacement plot is emphasized. A discussion about some specimen parameters such as dimensionless initial crack length and width to half height (or width to radius) ratio is given.
Download or read book New Formulae for Determining Fracture Toughness of a Wide Range of Different Materials with Chevron Notched Short Rod and Short Bar Specimens written by XC. Yin and published by . This book was released on 1992 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: New formulae are presented to re-evaluate plain strain fracture toughness of brittle and ductile materials from previous works on chevron-notched specimens. The fracture toughness KIm from the new formulae agree with values of KIC from ASTM specimens. The KIm measurements are successful in tests of tough aluminum when the fracture toughness exceeds 40 MPa . m1 2 and steel 20G with the plasticity factor p approach 1. It is found that the valid specimen size could be smaller than 1.25(KIC/?S)2 for aluminum alloys, and even less than 0.1(KIC/?S) for steel 20G when the KIm formulae are used.
Download or read book Fracture Toughness Determination with the Use of Miniaturized Specimens written by Jan Dzugan and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture mechanics has been used for decades nowadays, and methods have been well established in the community especially for standard-sized specimens. As it was mainly developed for large structure assessment against the brittle failure, standardized specimens are of large size at present. However, in many cases, these standard specimens are not possible to apply due to size requirements of the available experimental material or the size of the component considered. These can be cases of residual service life assessment of in-service components, local properties determination (e.g., across weld), anisotropy determination and assessment of mechanical properties of newly developed materials under laboratory conditions (e.g., SPD processed materials, et cetera). Therefore, development of new methods using significantly smaller specimens has to be carried out, and procedures using smaller-sized specimens together with their validity limits and relation to standardly obtained results have to be provided in order to provide solution for wide applications.
Download or read book A Procedure for Fracture Toughness Testing Using a Chevron Notched Crack Arrest Specimen written by RJ. Bonenberger and published by . This book was released on 1998 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new chevron-notched crack-arrest (CNCA) specimen has been developed for determining the fracture toughness of metals in a more cost-effective manner. The specimen is a hybrid design that incorporates features from the standard KIc and KIc specimens. Details of the specimen geometry and associated test procedures are described. Strain gages record the stress state in the specimen, and a clip gage measures the crack mouth opening displacement. The method for extracting arrest and initiation toughness from the measured data is presented. Fracture experiments using the CNCA specimen ware conducted to determine Ka and Kc for A533-B reactor grade steel at 23°C. The Ka and Kc results from this study were consistent with similar data established for the same material by other-researchers. A fractographic analysis identified cleavage as the dominant failure mode during crack propagation, with a conversion to ductile tearing just before arrest.
Download or read book Method of Test for Determination of Fracture Toughness in Metallic Materials Using Single Edge Notched Tension SENT Specimens written by British Standards Institute Staff and published by . This book was released on 1914-12-01 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metals, Test equipment, Testing, Mechanical testing, Strength of materials, Fracture toughness, Mechanical behaviour of materials, Physical properties of materials, Classification systems, Measurement characteristics
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review of Chevron notched Fracture Specimens written by and published by . This book was released on 1984 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Closed form Expressions for Crack mouth Displacements and Stress Intensity Factors for Chevron notched Short Bar and Short Rod Specimens Based on Experimental Compliance Measurements written by and published by . This book was released on 1992 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Fracture Toughness of a C MN Steel Using Small Notched Tensile Specimens written by S. Carassou and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture toughness testing of irradiated or aged materials is often limited due to the lack of available material. Subsize Charpy, small CT specimens or small punch test is generally used to overcome this limitation. In this paper, a method based on small notched tensile specimen testing is presented and used for evaluation of fracture toughness properties of a C-Mn steel with a large inclusions content. Specimens are cut in the radial and circumferential directions from a C-Mn steel pipe and tested at 100°C. The diameter of the smallest specimens is 3.6 mm. The average strain at fracture and finite elements simulation of the notched specimens are used to determine the critical values of a local ductile fracture criterion. These values are subsequently used in conjunction with finite element simulations to predict the fracture toughness of the material in different orientations. The predictions are compared with fracture toughness measured on 1⁄2 T, 1 T and 2 T-CT specimens.
Download or read book Compliance Measurements of Chevron Notched Four Point Bend Specimen written by Anthony Martin Calomino and published by . This book was released on 1994 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The ISRM Suggested Methods for Rock Characterization Testing and Monitoring 2007 2014 written by R. Ulusay and published by Springer. This book was released on 2014-07-25 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of ISRM suggested methods for testing or measuring properties of rocks and rock masses both in the laboratory and in situ, as well as for monitoring the performance of rock engineering structures. The first collection (Yellow Book) has been published in 1981. In order to provide access to all the Suggested Methods in one volume, the ISRM Blue Book was published in 2007 (by the ISRM via the Turkish National Group) and contains the complete set of Suggested Methods from 1974 to 2006 inclusive. The papers in this most recent volume have been published during the last seven years in international journals, mainly in Rock Mechanics and Rock Engineering. They offer guidance for rock characterization procedures and laboratory and field testing and monitoring in rock engineering. These methods provide a definitive procedure for the identification, measurement and evaluation of one or more qualities, characteristics or properties of rocks or rock systems that produces a test result.
Download or read book Properties Related to Fracture Toughness written by and published by ASTM International. This book was released on 1976 with total page 156 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 1994 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
