Fluid and Matrix Components of Polyurethane Foam Behavior Under Cyclic Compression

Abstract

Semi-rigid polyurethane foam specimens were compressed to 25, 50, or 75 percent strain at nominal strain rates of 0.14/s, 1.4/s or 14/s for up to 100 cycles. The loads carried by the fluid and matrix phases of the foam were determined over these deformation histories using an experimental method recently developed by the authors. The fluid phase contributed significantly to the first-cycle stress of specimens compressed to 50 or 75 percent strain. During subsequent cycles, the fluid component decreased more quickly than the matrix component and became negligible by 100 cycles.

Impact Testing of Cellular Materials with Field Measurement – A Review

“…However, experimental techniques differ when the strain rate is more or less important. Rapid hydraulic testing machine [19][20] or falling weight arrangements [21][22] are techniques often reported in the literature. However, even those techniques can provide a suitable mechanical loading over a large range of strain rates, the quality of measuring approaches associated with those techniques decreases with the increase of the strain rates.…”

On the behaviour characterization of metallic cellular materials under impact loading

“…However, experimental techniques differ when the strain rate is more or less important. Rapid hydraulic testing machine [26,27] or falling weight arrangements [28,29] are techniques often reported in the literature. However, even those techniques can provide a suitable mechanical loading over a large range of strain rates, the quality of measuring approaches associated with those techniques decreases with the increase of the strain rates.…”

Measurement of deforming mode of lattice truss structures under impact loading

“…However, experimental techniques differ when the strain rate is important. Rapid hydraulic testing machine [15,16] or falling weight arrangements [17,18] are techniques often reported in the literature. Even those techniques can provide a suitable mechanical loading over large range of strain rates, the quality of the measuring approaches associated with those techniques decreases with the increase of strain rates.…”