From instability and time dependence on the microscale to stability and time independence on the macroscale

Article Abstract:

The stable time-independent macroscopic equations of quasistatic loading of ductile structural metals address the mechanisms of the growth and opening of voids/cracks. These dynamic inelastic deformations cause instabilities in the time-dependent microscale. The atomic configurations of single/groups of dislocations are highly unstable over a large area of the paths of rigid motion. The examples of masking of the unstable behavior of the microscale by spatial and temporal inhomogeneity is discussed.

Observations, Deformations (Mechanics), Deformation, Structural analysis (Engineering)

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Fluid and matrix components of polyurethane foam behavior under cyclic compression

Article Abstract:

Polymer matrix and the pore fluid phases have different contributions to the load carried by semi-rigid polyurethane foam specimens under cyclic compression. The fluid phase base load decreases during the first few cycles due to damage to the foam fabric. The matrix and fluid loads reduce with reduction in maximum strain, foam density, strain rate. The specimens are compressed at nominal strain rates of 0.14/sec, 1.4/sec or 14/sec up to 100 cycles of displacement controled dynamic strain.

Research, Usage, Strains and stresses, Stresses (Materials), Polyurethanes

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