Author: John E. Dorn
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 19
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Book Description
Apparatus has been developed to allow the compression testing of sheet materials at elevated temperatures. It includes a testing fixture, a special extensometer, and an oil-bath furnace which are described in detail. The short-time compressive properties of five high-strength aluminum alloy sheet materials have been determined at temperatures up to 300 F. after exposures ranging from 1⁄2 to 1000 hr. The materials include 24S-T, 24S-T81, 24S-T86, R301-T, and 75S-T. The effects of temperature and time on compressive yield strength are compared with those for the corresponding tensile properties and it is found that approximate values of compressive yield strength may be derived from calculations based upon the tension values. Of the materials tested, the members of the 24S-T8 series appear to offer the best possibilities for elevated-temperature service.
Author: Eldon E. Mathauser
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 54
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Book Description
Compressive stress-strain test results for 7075-T6 aluminum-alloy sheet are presented for temperatures ranging from room temperature to 700 degrees F and for exposure times from 0.1 to 100 hours. All specimens were loaded parallel to the rolling direction of the sheet and tested at a nominal strain rate of 0.002 per minute. Stress-strain curves are presented for each temperature and exposure time investigated, and significant design data obtained from the curves (compressive yield stress, Young's modulus, secant and tangent moduli, and two stresses useful for determining the maximum compressive strength of plates) are presented in graphical and tabular form. A time-temperature parameter derived from rate-process theory is used to present the compressive yield stresses as a single master curve.
Author: P. R. Dioguardo
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 148
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Book Description
Short time tensile and compressive properties were evaluated for Rene' 41 and Haynes 25 sheet alloys at room temperature and 800 to 2200 F. Tests conducted at various strain rates (0.00001 to 0.1 in./in.sec) produced significant differences in strength, particularly at elevated temperatures. Creep properties, both tensile and compressive, were determined for the same alloys at temperatures of 1600 to 2200 F and times up to 15 minutes. At the higher stress levels, creep rates became very rapid and considerable amounts of plastic strain occurred in times of 1 sec or less. A preliminary study was conducted on the use of programmed, forced strain rate tests to predict short time creep properties.
Author: George J. Heimerl
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 48
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Author: Eldon E. Mathauser
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 66
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Compressive stress-strain test results for 2024-T3 aluminum-alloy sheet are presented for temperatures ranging from room temperature to 700 degrees F and for exposure times from 0.1 to 100 hours. All specimens were loaded parallel to the rolling direction of the sheet and tested at a nominal strain rate of 0.002 per minute. Stress-strain curves are presented for each temperature and exposure time investigated, and significant design data obtained from the curves (compressive yield stress, Young's modulus, secant and tangent moduli, and two stresses useful for determining the maximum compressive strength of plates) are presented in graphical and tabular form. A rate-process relationship is used to determine the exposure time that produces a maximum compressive yield stress for a given temperature and a time-temperature parameter derived from rate-process theory is used to present the compressive yield stresses as a single master curve.
Author: William M. Roberts
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 18
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Book Description
Results are presented of compressive stress-strain tests of 24S-T3 aluminum-alloy sheet at stabilized elevated temperatures up to 700 degrees F, exposure times of 1/2 to 2 hours, and strain rates of 0.002 to 0.006 per minute. Some general comparisons with extruded 75S-T6 aluminum alloy are included.
Author: United States. Department of Defense
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 478
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Author: Joseph N. Kotanchik
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 32
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Summary: An experimental study was made to determine the effect of artificial aging on the tensile properties of alclad 24S-T and 24S-T aluminum-alloy sheet material. The results of the tests show that certain combinations of aging time and temperature cause a marked increase in the yield strength and a small increase in the ultimate strength; these increases are accompanied by a very large decrease in elongation. A curve is presented that shows the maximum yield strengths that can be obtained by aging this material at various combinations of time and temperature. The higher values of yield stress are obtained in material aged at relatively longer times and lower temperatures.
Author:
Publisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 790
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Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1208
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