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Notch sensitivity

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230209
EISBN: 978-1-62708-298-3
...Abstract Abstract This chapter describes the effect of processing variables on the mechanical properties of beryllium, including tensile and yield strength, fracture toughness, creep and fatigue strength, ductile-to-brittle transition, and notch sensitivity. It also discusses the effects...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870179
EISBN: 978-1-62708-344-7
.... and Hardrath H.F. , “An Engineering Method for Estimating Notch-Size Effect in Fatigue Tests of Steel,” NACA TN 2805 , National Advisory Committee for Aeronautics , Washington, DC , Oct 1952 8.9 Peterson R.E. , Notch-Sensitivity, Chapter 13 , Metal Fatigue , Sines G...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
.... Values of the fatigue notch factor vary with the severity of the notch, the type of notch, the material, the type of loading, and the applied stress level. Notched fatigue data are also reported using a notch sensitivity factor, q : (Eq 14.24) q = K f − 1 K t − 1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240201
EISBN: 978-1-62708-251-8
... do not always reveal metallurgical or environmental changes that can lead to reduced local ductility. The tendency for reduced ductility in the presence of a triaxial stress field caused by a notch is called notch sensitivity. A common way of evaluating notch sensitivity is a tension test using...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610025
EISBN: 978-1-62708-303-4
... is called notch sensitivity. A common way of evaluating notch sensitivity is a tension test using a notched specimen. The notched tensile test has been used extensively for investigating the properties of high-strength steels, for studying hydrogen embrittlement in steels and titanium, and for investigating...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... Fig. 46 Notch sensitivity versus notch radius for steels. Source: Ref 11 Fig. 47 Effect of surface finish on fatigue of steels. Source: Ref 24 Fig. 1 Typical loading cycles. Source: Ref 1 Fig. 2 Schematic of R.R. Moore reversed bending fatigue machine. Source...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... at very high stresses, as follows: (Eq 3.8) ∊ ˙ = A exp  ( C 7 σ ) where A and C 7 are stress-independent constants. Because creep is a thermally activated process, its temperature sensitivity would be expected to obey an Arrhenius-type expression, with a characteristic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
.... In addition, notched-bar tests are also carried out in the laboratory to ensure freedom from notch sensitivity. Obviously, low rupture ductilities lead to notch sensitivity, and the long-term values of neither of them can be predicted on the basis of short-term tests. Numerous failures of 1Cr-1Mo-V steel...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780204
EISBN: 978-1-62708-281-5
..., into the material. By reversing the specimen in the vise, a comparison can be made between the notched and unnotched strengths. By machining notches of different radii, notch sensitivity can be determined. A plot of impact strength as a function of the radius of the tip of the notch for different plastics is given...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480113
EISBN: 978-1-62708-318-8
... strength of titanium is altered by the presence of notches and the sensitivity of a given material to stress concentrations produced by these notches. In a smooth test specimen stressed in tension, the stress is uniform over the entire cross section. In notched specimens, the stresses are not uniform...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240221
EISBN: 978-1-62708-251-8
..., the keyhole and U-notch tests generally yield higher values of toughness and lower transition temperatures. They are more appropriate when testing materials that are less ductile or have a high notch sensitivity. Fig. 13.10 Charpy impact specimen configurations Applications of the notched bar...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780185
EISBN: 978-1-62708-281-5
... . When the temperature increases to near the T g , the impact strength increases. With notch-sensitive materials such as some crystalline plastics, environmental factors can create surface microcracks and reduce impact strength considerably. Table 4 is a summary of fracture behavior of various...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310001
EISBN: 978-1-62708-286-0
... resembles low-carbon steel in mechanical behavior. It shares the following characteristics: A toughness transition that occurs around room temperature Notch sensitivity A yield point phenomenon Pronounced crystallographic anisotropy of mechanical properties High stacking fault energies...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870001
EISBN: 978-1-62708-314-0
... to failure Notch sensitivity    Static Greater sensitivity    Fatigue Less sensitivity Transverse properties Weaker Mechanical property variability Higher Fatigue strength Higher Sensitivity to hydrothermal environment Greater Sensitivity to corrosion Much less Damage growth...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... of nonuniform structure is not optimal. The harder regions tend to have lower fracture toughness and have higher notch sensitivity than the darker, more tempered regions. Because of this, it was thought that the premature fracture occurred because of improper heat treatment. The presence of a higher level...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060049
EISBN: 978-1-62708-261-7
... specimens. Comparing the fatigue-strength reduction factor to the theoretical stress-concentration factor gives a measure of the sensitivity of the material to notches when under cyclic loading; notch sensitivity is the fatigue factor divided by K t – 1 and often is expressed as a percentage. Several...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060247
EISBN: 978-1-62708-261-7
... (22 to 63 ksi). Gray cast irons are also brittle due to the inherent notch effect of the flake graphite. Toughness of gray iron is typically lower than other types of graphitic irons, but it is less notch sensitive and does not exhibit a severe drop in toughness at lower temperatures. Mechanical...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780055
EISBN: 978-1-62708-281-5
... a different ductile/brittle transition. Energy absorption, however measured, is made up of many complex processes involving elastic and plastic deformation, notch sensitivity, and fracture processes of crack initiation and propagation. The prediction of strength and impact resistance of plastic parts...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
..., and geometric features (e.g., notches, preexisting cracks, and/or discontinuities). However, ductility and brittleness of a material (in a given geometry/service condition) also depends on the state of stress. Therefore, it is necessary to understand not only why some materials are inherently ductile or brittle...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610377
EISBN: 978-1-62708-303-4
...Composites vs. metals comparison Table 1 Composites vs. metals comparison Condition Comparative behavior relative to metals Load-strain relationship More linear strain to failure Notch sensitivity Static Greater sensitivity Fatigue Less sensitivity Transverse properties...