Comparison of Chevron-Notched Specimen Types for Fracture Toughness Testing of Aluminum PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Comparison of Chevron-Notched Specimen Types for Fracture Toughness Testing of Aluminum PDF full book. Access full book title Comparison of Chevron-Notched Specimen Types for Fracture Toughness Testing of Aluminum by J. Morrison. Download full books in PDF and EPUB format.
Author: J. Morrison Publisher: ISBN: Category : Aluminum Languages : en Pages : 6
Book Description
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.
Author: J. Morrison Publisher: ISBN: Category : Aluminum Languages : en Pages : 6
Book Description
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.
Author: Kevin R. Brown Publisher: ASTM International ISBN: 080311480X Category : Fracture mechanics Languages : en Pages : 200
Book Description
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
Author: LM. Barker Publisher: ISBN: Category : Chevron-notched specimens Languages : en Pages : 6
Book Description
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.
Author: XC. Yin Publisher: ISBN: Category : Brittle materials Languages : en Pages : 9
Book Description
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.
Author: D. Munz Publisher: ISBN: Category : Brittleness Languages : en Pages : 5
Book Description
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.
Author: DG. Munz Publisher: ISBN: Category : Aluminum oxide Languages : en Pages : 11
Book Description
Plane-strain fracture toughness measurements were made on aluminum oxide using short-rod and short-bar chevron-notched specimens previously calibrated by the authors for their dimensionless stress intensity factor coefficients. The measured toughness varied systematically with variations in specimen size, proportions, and chevron notch angle apparently due to their influence on the amount of crack extension to maximum load (the measurement point). The toughness variations are explained in terms of a suspected rising R-curve for the material tested, along with a discussion of an unavoidable imprecision in the calculation of KIc for materials with rising R-curves when tested with chevron-notched specimens.
Author: KR. Brown Publisher: ISBN: Category : Aluminum alloys Languages : en Pages : 18
Book Description
An extensive study of the use of the chevron-notched short-bar (CNSB) specimen for measuring plane-strain fracture toughness in high-strength aluminum alloys is reported. The toughness measured in a CNSB specimen, KSB, correlates closely with plane-strain fracture toughness, KIc, for toughnesses less than 35 MPa m1/2. At higher toughnesses KSB is higher than KIc for two reasons; first, sample heterogeneity causes the different sized specimens to sample different material, and second, an effect of rising crack growth resistance in the toughness range 40 to 55 MPa m1/2; these latter test results should be considered invalid; however, within this range the KIc, KSB correlation, although largely empirical, is still useful for screening purposes.
Author: Publisher: ISBN: Category : Languages : en Pages : 54
Book Description
Fracture toughness values obtained from small laboratory size specimens in four point slow-bend loading were compared with values obtained in testing large semi-infinite center notched plate specimens.
Author: J. Morrison
Author: J. Morrison
Author: John H. Underwood
Author: Kevin R. Brown
Author: LM. Barker
Author: 
Author: XC. Yin
Author: D. Munz
Author: DG. Munz
Author: KR. Brown
Author: