Tiger stripes

Fig. 13.21 Schematic representation of the surface defects that appear periodically and alternate in location on opposite sides of a flat mold. [Reprinted by permission from A. C. B. Bogaerds, G. W. M. Peters, and F. P. T. Baaijens, Tiger Stripes Instabilities in Injection Molding, in Polymer Processing Instabilities, S. G. Hatzikiriakos, and K. B. Migler, Eds., Marcel Dekker, New York, 2005.]...

Viscoelastic phenomena may be described through three aspects, namely stress relaxation, creep and recovery. Stress relaxation is the decline in stress with time in response to a constant applied strain, at a constant temperature. Creep is the increase in strain with time in response to a constant applied stress, at a constant temperature. Recovery is the tendency of the material to return partially to its previous state upon removal of an applied load. The material is said to have memory as if it remembers where it came from. Because of the memory effect, in transient flows the behavior of viscoelastic fluids wUl be dramatically different from that of Newtonian fluids. Viseoelastie fluids are fiiU of instabilities. Some examples inelude instabilities in Taylor-Couette flow, in eone-and-plate and plate-and-plate flows (Larson 1992). The extrudate distortion, commonly called melt fraeture, is a notorious example of viscoelastic instability in polymer processing. The viseoelastie instability in injection molding can result in specific surface defects such as tiger stripes (Bogaerds et al. 2004). 

Spencer et al., 2009 [317] discussed Enceladus as an active cryovolcanic satellite. Plumes, both large and small, spray water ice out from many locations along the famed tiger stripes near Enceladus south pole. 

Tiger Skin. A decorative salt glaze (q.V.), in which crawling gives a striped or mottled appearance. 

In biology the term hybridization may refer to the result of interbreeding between two animals or plants of different species. For example, the tigron is a hybrid cross between a female lion and a male tiger. Tigrons have a blend of lion and tiger features, for example, they may show spots and stripes. 

If we take a white cardboard model, say of a cat, and treat it with these solntions in the. form of an antimony chloride groundwork, crossed by transverse stripes of acetate of lead, then, on subjecting it to the fumes of hydrogen sulphide, our cat becomes a tiger (Fig. 9). 

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