By Michael Anthony Nastasi; Don M Parkin; H Gleiter; North Atlantic Treaty Organization. Scientific Affairs Division
Read Online or Download Mechanical properties and deformation behavior of materials having ultra-fine microstructures : [proceedings of the NATO Advanced Study Institute on Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures, Porto Novo, PDF
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Additional info for Mechanical properties and deformation behavior of materials having ultra-fine microstructures : [proceedings of the NATO Advanced Study Institute on Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures, Porto Novo,
Sample text
Structures subjected to significant dynamic loading are prone to undergo fatigue damage during their service lives, especially when their use is prolonged beyond the design life. It is well recognized that the reliability of engineering components under dynamic loading conditions directly depends on the material response to cyclic loading. Generally, effects of cyclic loading are related to definite micro-structural changes in the material, principally, in the form of damage accumulation. In general, in all engineering materials the time-dependent behavior gets modified in the presence of cyclic loads.
An important limitation in HPT is that the imposed strain varies across the sample and, in theory the strain is reduced to zero in the center of the disk. As a consequence of this strain variation, it is reasonable to believe that the microstructures produced by HPT will be inhomogeneous [140]. A schematic of the process is given in Fig. 18. A work-piece is held between anvils (upper ram and lower support) and strained in compression under an applied pressure of several GPa. After pressing and holding the work-piece using the upper holder, the lower holder rotates and surface friction forces between the work-piece and the rotating lower die deform the work-piece by shear force.
The difficulty in characterizing the fatigue behavior of fully dense NC materials of relatively uniform purity and grain size stem from current restrictions in producing samples with sufficient dimensions for ‘‘valid’’ fatigue testing. The thickness of the laboratory specimens produced by the SPD techniques is often limited, particularly the samples processed through ECAP and HPT. These have final dimensions of a few mm and the samples produced by processes like RCS and ARB display uneven deformation along the samples, which again is a bottleneck in preparing the sample for conventional fatigue testing [183].
