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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 27
SUMMARY:The physics and mechanics of herringbone and diagonal buckling flatness distortions
DESCRIPTION:Herringbone and diagonal-wrinkles / cross-buckles are related members of a family
of non-trivial, visually stunning, and terribly confounding flatness defects. This family
encompasses a spectrum of cascading complexity, ranging from a relatively simple,
full width diagonal wrinkles to several varieties of multi-facetted, high-fidelity crosshatch
patterns. These distortions form when a region of near flat (or lightly centerbuckled
/ loose) strip is subjected to planar shearing. The shearing stems from a
variety of unrelated, and possibly cooperative causes (e.g., misalignments, camber
straightening, asymmetric roll bite lubricity, transverse thermal gradients, etc.),
forming an angled field of compressive strain (with respect to the strip’s longitudinal
/ rolling axis). Localized buckling spontaneously occurs when the work done in
compressive straining (the act of physically displacing the material) exceeds the
threshold condition of the strain energy required to deform the material (thereby
achieving a minimum energy equilibrium). The most general form of manifest
buckling is a highly ordered, self-assembling checkerboard-like pattern associated
with classical thin plate buckling. The simplest variants manifest in a diagonal or
chevron pattern. While the visual appearance of these lesser variants may have
reduced complexity, the entire herringbone family shares the same underlying
framework and physics. This paper examines the underlying physics and mechanics
of the herringbone family by analyzing the formation mechanisms of relatively simple
diagonal buckling. Classical mechanics and Mohr’s circle are employed to provide
insight into how increased exit tension suppresses defect formation in the presence
of the possibly cooperative causes.
CLASS:PUBLIC
DTSTART:20230614T123000
DTEND:20230614T125000
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