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(Left) Illustration of strain vs stress of polyolefin packaging foam in cross section. The graph reveals a nearly linear relationship between strain and stress at low stress levels of up to ; nonlinearities and hysteresis occur only at higher stress levels. (right) Small signal elastic modulus of the foam vs pressure when pressure is increased up to at . Three distinct regions characterize the elastic behavior of the foam: linear (I) and nonlinear elasticity regions with softening (II) and densification (III) of the foam.
The cross-sectional electron microscope scan of polyolefin packaging foam shows few large and anisotropically shaped voids across the thickness of the foam.
(a) The change in capacitance of a single sensor element correlates with the load. (b) Signal and noise level for a sensor element, which is periodically exposed to a load per area of . (c) Flexible pressure-sensitive skinlike electronic surface with 96 capacitive sensor elements for the detection of shelf stocks (loaded and unloaded sensors).
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