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  • 1985-1989  (9)
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  • 1
    facet.materialart.
    Unknown
    A note on grain boundary diffusion controlled cavity growth during elevated temperature fatigue (1985)
    Springer
    Details
    Publication Date: 1985-02-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 2
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    A note on grain boundary diffusion controlled cavity growth during elevated temperature fatigue (1985)
    Springer
    Details
    Publication Date: 1985-01-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 3
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    HIGH TEMPERATURE FATIGUE DAMAGE IN THREE AUSTENITIC ALLOYS (1988)
    Springer
    Details
    Publication Date: 1988-09-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 4
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    EFFECT OF HOLD-TIME DAMAGE ON HIGH TEMPERATURE FATIGUE BEHAVIOUR (1989)
    Springer
    Details
    Publication Date: 1989-09-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 5
    Electronic Resource
    Electronic Resource
    HIGH TEMPERATURE FATIGUE DAMAGE IN THREE AUSTENITIC ALLOYS (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 11 (1988), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— A series of cyclic strain controlled tests have been carried out at 600°C on three high temperature austenitic iron-based alloys. These alloys were AISI type 316 stainless steel, Alloy 800 H and Sandvik 253 MA. The tests were carried out under constant total strain control using a constant strain rate of 0.005 s−′. Damage mechanics was applied to the results in order to follow the accumulation of damage. By consideiing the changes in modulus throughout the life of each specimen it was found that damage evolution could be successfully predicted as a function of plastic strain range despite the fact that each alloy had been chosen because of a different stress response at 600°C, namely cyclic saturation, hardening, and softening followed by hardening for the AISI 316, 253 MA and Alloy 800 H respectively. Although each alloy accumulated fatigue damage in a similar manner the longer lives of Sandvik 253 MA and Alloy 800 H at a given total strain range were due to a smaller plastic strain component and a reduced stage I crack propagation rate. In the 253 MA alloy. slip was predominantly planar with some cells occasionally forming at high strain ranges. Slip was localized in Alloy 800 H due to the shearing of small γ precipitates. In the AISI 316 stainless steel, dislocation cells formed at all strain ranges. It is concluded that all these alloys accumulate damage similarly, independent of their deformation behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1988.tb01392.x
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  • 6
    Electronic Resource
    Electronic Resource
    EFFECT OF HOLD-TIME DAMAGE ON HIGH TEMPERATURE FATIGUE BEHAVIOUR (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— —A series of tests has been carried out to investigate the effect of sequential high frequency fatigue cycles interspersed with hold times on elevated temperature crack growth rates in AISI type 304 stainless steel. Each test sequence included different combinations of fatigue cycles and hold-times. Those sequences which included the smallest number of fatigue cycles resulted in the fastest crack propagation rates. The sequence with a block of 1000 cycles and a 120min hold time had the slowest crack propagation rate, similar to that for a reference 5 Hz fatigue test. Examination of the fracture surfaces revealed alternating regions of transgranular and intergranular fracture corresponding to the respective fatigue block and hold-time period. Intergranular fracture was observed to be characteristic of maximum time-dependent and time-independent damage interaction, which was associated with those specimens subjected to sequences including a block of 50 fatigue cycles, possessing the fastest crack propagation rates. The results may be explained using a model based on fatigue-creep-environment interaction. During the hold-time a damaged zone due to oxidation induced cavitation formed at the crack tip. Depending on the stress intensity factor range, the subsequent fatigue cycles continued to extend the crack through part or whole of the remaining portion of this region. For the remainder of the fatigue block the crack propagated in its normal transgranular mode. Oxide induced closure at low ΔK levels brought about the lowest crack propagation rate for the sequence consisting of a block of 1000 cycles and a 120 min hold period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1989.tb00546.x
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  • 7
    Electronic Resource
    Electronic Resource
    Hydrodynamic analysis of a spiral disc extruder (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 589-595 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The flow of polymer melts in a rotating disc extruder is analyzed with the development of a mathematical model for drag flow in a contoured rotating disc. The model assumes a fully melted material which exhibits Newtonian flow behavior under isothermal conditions. Flow is evaluated in successive sections of the flow path, and the drag flow component is calculated by assuming a zero pressure gradient by analogy to the analysis of single screw extruder performance. The final expression involves a computer-assisted numerical solution. Results of the drag flow model are presented for three different disc geometries. A mathematical model of negative flow, and a comparison of the results with experimental data will be presented in followup papers.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760251003
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrodynamic analysis of negative flow in a spiral disc extruder (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 596-603 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The flow of polymer melts in a rotating disc extruder is analyzed with a mathematical model for pressure flow and leakage flow (termed neg ative flow). It is assumed that the material is fully melted and exhibits Newtonian flow behavior under isothermal conditions for each element. Flow is evaluated in successive sections of the flow path and the final expression involves a computer-assisted numerical solution. Pressure flow, which is negative, is calculated by analyzing the situation in which the pressure gradient causes the extrudable material to flow back across the stationary disc. A simplified geometrical model is developed for numerical solution, assuming incompressible flow. Leakage flow is between the contours of the disc and the engaging interior face of the housing. The flow is also directed opposite to the drag component and is estimated by using parallel plate flow equations.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760251004
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental and theoretical evaluation of a spiral disc extruder (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 295-300 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A 5-inch diameter disc extruder was operated with a commercial polypropylene polymer to provide comparison data and the model predictions were compared to machine performance as a function of extrusion conditions and polymer characteristics. The mathematical model used for comparison has been described previously by the authors.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760250508
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