Author: F. J. Lauta
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 41
Book Description
Ths influence of work hardening exponent on the fracture toughness of 4340, 18% nickel maraging, and AM-355 stainless steel was studied. In most cases the effects produced by variations in work hardening were difficult to analyze due to accompanying changes in yield strength and microstructure. In this investigation the transition in fracture mode induced by varying section size was used as a basic evaluation method since complicating effects due to yield strength changes were not introduced. The results indicated that the transition from flat to shear failures occurred in larger section sizes in the material with the lower work hardening exponent. Once full shear failures were obtained, however, materials with higher work hardening coefficients required greater energy to produce failure. The influence of work hardening on the transition behavior could be rationalized on the basis of the larger plastic zone present in the steel with the lower strain hardening coefficient. Although useful correlations between the strain hardening index and the fracture mode transition could be obtained no quantitative relationship between work hardening exponent, as defined by strain to maximum load, and plane strain fracture toughness was evident. (Author).
Influence of Work Hardening Coefficient on Crack Propagation in High-strength Steels
Author: F. J. Lauta
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 41
Book Description
Ths influence of work hardening exponent on the fracture toughness of 4340, 18% nickel maraging, and AM-355 stainless steel was studied. In most cases the effects produced by variations in work hardening were difficult to analyze due to accompanying changes in yield strength and microstructure. In this investigation the transition in fracture mode induced by varying section size was used as a basic evaluation method since complicating effects due to yield strength changes were not introduced. The results indicated that the transition from flat to shear failures occurred in larger section sizes in the material with the lower work hardening exponent. Once full shear failures were obtained, however, materials with higher work hardening coefficients required greater energy to produce failure. The influence of work hardening on the transition behavior could be rationalized on the basis of the larger plastic zone present in the steel with the lower strain hardening coefficient. Although useful correlations between the strain hardening index and the fracture mode transition could be obtained no quantitative relationship between work hardening exponent, as defined by strain to maximum load, and plane strain fracture toughness was evident. (Author).
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 41
Book Description
Ths influence of work hardening exponent on the fracture toughness of 4340, 18% nickel maraging, and AM-355 stainless steel was studied. In most cases the effects produced by variations in work hardening were difficult to analyze due to accompanying changes in yield strength and microstructure. In this investigation the transition in fracture mode induced by varying section size was used as a basic evaluation method since complicating effects due to yield strength changes were not introduced. The results indicated that the transition from flat to shear failures occurred in larger section sizes in the material with the lower work hardening exponent. Once full shear failures were obtained, however, materials with higher work hardening coefficients required greater energy to produce failure. The influence of work hardening on the transition behavior could be rationalized on the basis of the larger plastic zone present in the steel with the lower strain hardening coefficient. Although useful correlations between the strain hardening index and the fracture mode transition could be obtained no quantitative relationship between work hardening exponent, as defined by strain to maximum load, and plane strain fracture toughness was evident. (Author).
Influence of Work Hardening Exponent on Crack Propagation in High-strength Materials
Author: G. L. Hanna
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 84
Book Description
The influence of work hardening exponent on the variation of fracture toughness with material thickness was studied for high strength steel, aluminum, and titanium alloys. A variety of materials could be compared by employing normalizing parameters to represent the toughness in terms of the relative plastic zone size and representing the relationship on a logarithmic plot. Using this method the normalized fracture toughness parameter in the region of 100% slant fracture was proportional to the square of the work hardening exponent for the body-centered cubic metals. In the fracture mode transition region, however low work hardening was beneficial and the thickness at which the transition occurred decreased as the work hardening exponent increased. The influence of work hardening exponent on cyclically-induced crack growth rates in AISI 4340 steel and 13V-11Cr-3A1 titanium was also evaluated. In the steel the growth rate was slightly less for the material with the lower work hardening exponent while the titanium exhibited so significant trend as a function of work hardening characteristics. The specimen thickness had the greatest effect on the cyclically-induced crack growth with decreased growth rates present in the thicker specimens. Attempts were also made to control the process zone size by adding zirconia particles to a high strength steel matrix through powder metallurgy techniques.
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 84
Book Description
The influence of work hardening exponent on the variation of fracture toughness with material thickness was studied for high strength steel, aluminum, and titanium alloys. A variety of materials could be compared by employing normalizing parameters to represent the toughness in terms of the relative plastic zone size and representing the relationship on a logarithmic plot. Using this method the normalized fracture toughness parameter in the region of 100% slant fracture was proportional to the square of the work hardening exponent for the body-centered cubic metals. In the fracture mode transition region, however low work hardening was beneficial and the thickness at which the transition occurred decreased as the work hardening exponent increased. The influence of work hardening exponent on cyclically-induced crack growth rates in AISI 4340 steel and 13V-11Cr-3A1 titanium was also evaluated. In the steel the growth rate was slightly less for the material with the lower work hardening exponent while the titanium exhibited so significant trend as a function of work hardening characteristics. The specimen thickness had the greatest effect on the cyclically-induced crack growth with decreased growth rates present in the thicker specimens. Attempts were also made to control the process zone size by adding zirconia particles to a high strength steel matrix through powder metallurgy techniques.
Technical Abstract Bulletin
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 908
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 908
Book Description
A Review of the Air Force Materials Research and Development Program
Author:
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 200
Book Description
Technical reports published by the Air Force Materials Laboratory during the period 1 July 1964 - 30 June 1965 are abstracted herein. Reports on research conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included.
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 200
Book Description
Technical reports published by the Air Force Materials Laboratory during the period 1 July 1964 - 30 June 1965 are abstracted herein. Reports on research conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included.
NASA Technical Memorandum
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 40
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 40
Book Description
The Influence of Crack Length and Thickness in Plane Strain Fracture Toughness Tests
Author: Melvin H. Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
Book Description
The Effect of Environment on Fatigue Crack Propagation in 4340 Steel
Author: Roger Charles Rowlands
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 152
Book Description
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 152
Book Description
Fracture Toughness Evaluation by R-curve Methods
Author: D. E. McCabe
Publisher: ASTM International
ISBN:
Category : Metals
Languages : en
Pages : 120
Book Description
Publisher: ASTM International
ISBN:
Category : Metals
Languages : en
Pages : 120
Book Description
Abstracts of Active Contracts
Author: Air Force Materials Laboratory (U.S.).
Publisher:
ISBN:
Category : Defense contracts
Languages : en
Pages : 288
Book Description
Publisher:
ISBN:
Category : Defense contracts
Languages : en
Pages : 288
Book Description
Fracture Toughness Evaluation by R-curve Methods
Author:
Publisher: ASTM International
ISBN:
Category : Mathematics
Languages : en
Pages : 124
Book Description
Publisher: ASTM International
ISBN:
Category : Mathematics
Languages : en
Pages : 124
Book Description