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 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 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 Chevron notched Specimens written by J. H. Underwood and published by . This book was released on 1984 with total page 0 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 Chevron Notched Specimens for Fracture Toughness Measurements Independent of R Curve Effects written by LM. Barker and published by . This book was released on 1989 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A relatively new plane-strain fracture toughness test method based on chevron-notched test specimens has created a keen interest in comparing toughness measurements by the new method against measurements by the conventional method (ASTM E 399). Tests of various aluminum alloys by the two methods have shown a divergence in test results at the higher toughness levels. The rising R-curve effect in tough aluminums has been cited as one of the factors contributing to the observed discrepancy. This paper shows why the chevron-notched test results are independent of rising R-curve effects, whereas ASTM E 399 tests often are not. The E 399 test dependence on the rising R-curve constitutes a specimen size effect, and this dependence is partly responsible for the divergence between chevron-notched and E 399 tests of tougher aluminums. The chevron-notched method produces the toughness values which would be obtained from E 399 measurements if sufficiently large E 399 specimens could be tested.

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 Three dimensional Finite element Analysis of Chevron notched Fracture Specimens written by and published by . This book was released on 1984 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Discussion of Chevron Notched Specimens for Fracture Toughness Measurements Independent of R Curve Effects with Author s Closure written by D. Munz and published by . This book was released on 1990 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Three Dimensional Finite Element Analysis of Chevron Notched Fracture Specimens written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress-intensity factors and load-line displacements were calculated for chevron-notched bar and rod fracture specimens using a three-dimensional finite-element analysis. Both specimens were subjected to simulated wedge loading (either uniform applied displacement or uniform applied load). The chevron-notch sides and crack front were assumed to be straight. Crack-length-to-specimen width ratios (a/w) ranged from 0.4 to 0.7. The width-to-thickness ratio (w/B) was 1.45 or 2. The bar specimens had a height-to-width ratio of 0.435 or 0.5. Finite-element models were composed of singularity elements around the crack front and 8-noded isoparametric elements elsewhere. The models had about 11,000 degrees of freedom. Stress-intensity factors were calculated by using a nodal-force method for distribution along the crack front and by using a compliance method for average values. The stress intensity factors and load-line displacements are presented and compared with experimental solutions from the literature. The stress intensity factors and load-line displacements were about 2.5 and 5 percent lower than the reported experimental values, respectively. Raju, I. S. and Newman, J. C., Jr. Langley Research Center NASA-TM-85798, NAS 1.15:85798 RTOP 505-33-23-02...

Download or read book Performance of Chevron Notch Short Bar Specimen in Determining the Fracture Toughness of Silicon Nitride and Aluminum Oxide written by D. Munz and published by . This book was released on 1980 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ease of preparation and testing are advantages unique to the chevron-notch specimen used for the determination of the plane strain fracture toughness of extremely brittle materials. During testing, a crack develops at the notch tip and extends stably as the load is increased. For a given specimen and notch configuration, maximum load always occurs at the same relative crack length independent of the material. Fracture toughness is determined from the maximum load with no need for crack length measurement. Chevron notch acuity is relatively unimportant since a crack is produced during specimen loading. In this paper, the authors use their previously determined stress intensity factor relationship for the chevron-notch short bar specimen to examine the performance of that specimen in determining the plane strain fracture toughness of silicon nitride and aluminum oxide.

Download or read book Compliance and Stress Intensity Factor of Chevron Notched Three Point Bend Specimen written by W. Shang-Xian and published by . This book was released on 1984 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical dimensionless compliance formula and normalized load versus load-point displacement plot of chevron-notched three-point bend specimen are derived by use of Bluhm's slice model. The stress intensity factor coefficients are calculated for specimen geometries of W/B = 1.5 and 2, ? = 40° to 90°, and are fitted as polynomials. Fracture-toughness values KIcv of two heat-treatment conditions of GCr15 bearing steel are determined by chevron-notched specimens and compared with the ASTM E 399 valid fracture-toughness values. The comparisons show that for GCr15-I specimens with flat R-curves, KIcv and KIc are in agreement, but for the GCr15-IV specimens with rising R-curves, KIcv are near to Kmax, instead of KIc. The effect of machining tolerance of chevron notch on the measurements is analyzed.

Download or read book A Chevron Notched Specimen for Fracture Toughness Measurements of Ceramic Metal Interfaces written by LM. Barker and published by . This book was released on 1984 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new double cantilever beam specimen with a chevron notch (short bar) has been developed to measure the fracture toughness, (or resistance), GIc, of ceramicmetal interfaces. The analysis of the specimen is based on previously developed compliance calibrations for homogeneous materials. Toughness measurements on a zinc-silicate glass ceramic-molybdenum system demonstrated that the bond at this interface is as tough (13 J/m2) as the glass ceramic alone. Measurements on a lithium silicate glass ceramic-Hastelloy 276 metal system showed that the toughness of the interface depends on the degree of bonding ranging from 19 J/m2 for weak bonding to 54 J/m2 for strong bonding. This specimen is being suggested for use in the study of the effect of heat treatment and bonding chemistry on fracture of metal-ceramic interfaces.

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 Closed Form Expressions for Crack Mouth Displacements and Stress Intensity Factors for Chevron Notched Short Bar and Short Rod Specimens Based on Expe written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-23 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of equations are presented describing certain fracture mechanics parameters for chevron notch bar and rod specimens. They are developed by fitting compliance calibration data reported earlier. The equations present the various parameters in their most useful forms. The data encompass the entire range of the specimen geometries most commonly used. Their use will facilitate the testing and analysis of brittle metals, ceramics, and glasses. Bubsey, R. T. and Orange, T. W. and Pierce, W. S. and Shannon, J. L., Jr. Glenn Research Center RTOP 505-63-5B

Download or read book Chevron notched Specimens written by John H. Underwood and published by . This book was released on 1984 with total page 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.