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 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 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 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 Chevron notched Specimens Testing and Stress Analysis written by John H. Underwood and published by ASTM International. This book was released on 1984 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Using Chevron Notch Short Bar Specimens for Measuring the Fracture Toughness of a Martensitic Stainless Steel at High Hardness written by FJ. Dolan and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture toughness tests were conducted at room temperature and at - 196°C on a martensitic stainless steel that had been quenched and tempered to a hardness of Rockwell C 61-63. The fracture toughness specimens were chevron-notch, short-bar specimens for which B was 12.7 mm and W was 25.4 mm. Tests were conducted in accordance with ASTM Test Method for Plane-Strain (Chevron Notch) Fracture Toughness of Metallic Materials (E 1304-89).
Download or read book Comparison of Analytical and Experimental Stress Intensity Coefficients for Chevron V Notched Three Point Bend Specimens written by I. Bar-On and published by . This book was released on 1984 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chevron-notched specimens in a number of configurations have been recently used to determine plane-strain fracture toughness. Most researchers have employed tensile short-rod and short-bar specimens, while the three-point bend configuration has been used only to a limited extent despite its convenience for testing at ambient and high temperatures.
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 Comparison of Chevron Notched Specimen Types for Fracture Toughness Testing of Aluminum written by J. Morrison and published by . This book was released on 1989 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is increasing interest in the use of chevron-notched specimens for the measurement of plane-strain fracture toughness. Attention has been focussed on the short rod/bar specimens, for which several different geometries have been proposed. This paper describes a series of tests on 6061-T651 aluminum alloy aimed at providing a comparison of five short rod/bar specimen types with three different thicknesses. Also included are data from standard compact-tension specimens.
Download or read book Fracture Toughness of Polymer Concrete Materials Using Various Chevron Notched Configurations written by ER. Fuller and published by . This book was released on 1984 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fracture toughness of two similar polymer concrete materials was determined using several fracture mechanics configurations to show any influence of crack geometry on resistance to fracture in these materials. The testing configurations included a conventional straight-through notch in a flexure bar and various chevron-notched geometries in both flexure-bar and short-rod specimens. The materials were polymerized mixtures of monomers, anhydrous Type III portland cement, and silica sand. In one composition the monomers were styrene and trimethylolpropane-trimethacrylate; whereas, in the other composition, acrylonitrile was added as well. The fracture toughness was calculated from published stress-intensity coefficients for the straight-through notch which were adapted for use with a chevron notch by assuming that the derivative of the compliance with respect to crack length was the same for both notch types. Effects of varying chevronnotched angle, chevron-vertex position, and width of specimen in the crack plane were examined. Variation of these parameters to produce a wide variation in the width of the crack front shows minor if any influence on the fracture toughness measurements. In contrast, however, the calculated amount of crack extension for all the various specimen configurations indicates a trend of fracture toughness which is consistent with the concept of a rising crack-growth resistance curve for these materials.
Download or read book Science Abstracts written by and published by . This book was released on 1992 with total page 1228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Short Bar Chevron Notch Fracture Toughness of Bone Cement written by SK. Bhambri and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poly(methylmethacrylate) is used as a grouting agent in total joint arthroplasty. Fracture toughness of the relatively brittle bone cement is an important property determining the reliability and defect tolerance capability of the material. In the present study, fracture toughness of bone cement and commercial PMMA has been determined using a short bar chevron-notch test method. Chevron-notched short bar specimens were prepared with a notch molded-in during the polymerization process or by machining techniques. Specimen size and other test parameters were varied to determine variability of the results. In addition, parameters were also varied to simulate clinical practices.
Download or read book NASA Tech Briefs written by and published by . This book was released on 1994 with total page 1382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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:
