The Effect of Loading Rate and Temperature on the Fracture Toughness of High Strength Steels PDF Download
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Author: David P. Kendall
Publisher:
ISBN:
Category :
Languages : en
Pages : 2
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Book Description
The effect of loading rates, ranging from 10 to 100,000 ksi square root of (in/sec), and temperatures, ranging from room temperature to -100F, on the plane strain fracture toughness of several high strength alloy steels has been determined. Materials investigated are a commercial 4340 steel, a modified 4330 steel from a gun tube forging having three different heat treatments and two different heats of 250 grade maraging steel. Test specimens utilized are essentially ASTM 'compact tension' type specimens of one inch thickness. Tests were conducted on an open loop, hydraulic, high loading rate tensile testing machine. Results are presented in the form of graphs of fracture toughness versus temperature for the maximum and minimum loading rates ('dynamic' and 'static'). Fracture toughness versus loading rate at -60F and yield strength versus elastic strain rate at room temperature, -60F and -100F for one heat of maraging steel are also reported. (Author).
Author: David P. Kendall
Publisher:
ISBN:
Category :
Languages : en
Pages : 2
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Book Description
The effect of loading rates, ranging from 10 to 100,000 ksi square root of (in/sec), and temperatures, ranging from room temperature to -100F, on the plane strain fracture toughness of several high strength alloy steels has been determined. Materials investigated are a commercial 4340 steel, a modified 4330 steel from a gun tube forging having three different heat treatments and two different heats of 250 grade maraging steel. Test specimens utilized are essentially ASTM 'compact tension' type specimens of one inch thickness. Tests were conducted on an open loop, hydraulic, high loading rate tensile testing machine. Results are presented in the form of graphs of fracture toughness versus temperature for the maximum and minimum loading rates ('dynamic' and 'static'). Fracture toughness versus loading rate at -60F and yield strength versus elastic strain rate at room temperature, -60F and -100F for one heat of maraging steel are also reported. (Author).
Author: B. Marandet
Publisher:
ISBN:
Category : Charpy V-notch
Languages : en
Pages : 26
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Book Description
The fracture toughness of five structural steels was determined as a function of temperature in static and dynamic conditions (?K ? 2 x 104 MPa ?m/s). The most significant effect of increasing the strain rate was to shift the KIc-temperature curve towards higher temperatures. The amplitude of the temperature shift between the transition temperatures obtained in static (TKIc) and dynamic (TKId) conditions were compared with the predictions given by different models. It appeared that the variations of yield strength cannot always account for the change of fracture toughness with temperature and strain rate.
Author: Charles W. Marschall
Publisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 46
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Book Description
Author:
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 190
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Book Description
Author:
Publisher:
ISBN: 9780803120822
Category : Fracture mechanics
Languages : en
Pages : 23
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Book Description
Author: J. E. Campbell
Publisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 22
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Book Description
The Memorandum discusses the current situation on the inclusion of fracture-toughness testing requirements in specifications for high-strength steels used for military applications. The Memorandum was prepared at the request of The Technical Cooperation Program (TTCP), and contains information from Canadian and British members of that program, as well as U.S. information. Military applications discussed include missile motor cases, aircraft landing gear, gun tubes, armor plate, and hydrofoils. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author: Hans-Jakob Schindler
Publisher:
ISBN:
Category : Ferritic steel
Languages : en
Pages : 10
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Book Description
An increased loading rate causes not only a shift of the ductile-to-brittle transition curve, but also a slight change of the shape of this curve. The latter tends to become steeper as the loading rate increases. This effect was observed even at loading rates that are considered to be quasi-static according to ASTM E1921-13: Standard Test Method for Determination of Reference Temperature, T0, for Ferritic Steels in the Transition Range, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, 2013. Actually, the coefficient 0.019 in the exponent of the MC turned out to be substantially higher at elevated loading rates. This means that a basic assumption of the evaluation procedure of ASTM E1921 is not met, which leads to an increased uncertainty of T0 or T0,x, respectively. This effect of is most pronounced in testing at elevated loading rates using the single-temperature option. An improved method to determine the reference temperature is proposed, where the exponent in the median transition curve in ASTM E1921 is considered to be an open parameter. The resulting reference temperatures, denoted as T100 andT100,x, respectively, are expected to be more accurate than standard T0, which is confirmed by comparison with experimental data. Furthermore, the validity requirements for T100 are less restrictive and more suitable than those in ASTM E1921, since they do not depend on the outcome of the tests. Based on the improved data, an improved estimation formula for the rate-induced shift of T0 is derived. Suggestions are made for improvement of ASTM E1921.
Author: Laurence Stuart Costin
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 168
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Author: Philip H. Francis
Publisher:
ISBN:
Category : Hulls (Naval architecture)
Languages : en
Pages : 64
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Book Description
Yield strength and fracture toughness, as measured by the dynamic tear test, were determined as a function of load rate and temperature for several ship primary structure steels in strength ranges up to 100 ksi. The materials used were ABS-B, DS, AH-32, EH-32, CS, A517-D, A678-C, and A537-B, in one or two heats each. The effect of notch geometry, i.e., fatigue precracked vis-a-vis pressed notch, was investigated in some of the tests. By fully instrumenting some of the tests, the energy to maximum load as well as the total energy to failure was determined. Based on these energies, the resistance of the materials to crack initiation and to propagation could be examined. The results indicate potentially different fracture behavior between the high and low strength alloys. This in turn has implications in terms of the Ship Structure Committee Report SSC-244 proposed fracture criterion for qualifying toughness and crack arrest properties of ship steels and weldments. (Author).
