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Digitale Medien

Butterfly Shadows (1899)

WILSON-BARKER, D.

[s.l.] : Nature Publishing Group

Nature 61 (1899), S. 128-128

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] WHILE photographing insects lately in the hills above Pegli (Italy), I was much struck by the curious way in which many of the butterflies turned and shifted their position after they had settled, their apparently eccentric behaviour making it difficult to obtain a good picture. It suddenly ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/061128a0

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Digitale Medien

Further studies on dynamic crack branching (1983)

Ramulu, M. ; Kobayashi, A. S. ; Kang, B. S. J. ; [weitere]

Springer

Experimental mechanics 23 (1983), S. 431-437

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ISSN: 1741-2765

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract The newly derived dynamic-crack-branching criterion with its modifications is verified by the dynamicphotoelastic results of dynamic crack branchings in thinpolycarbonate, single-edged crack-tension specimens. Successful crack branching was observed in four specimens and unsuccessful branching in another. Crack branching consistently occurred when the necessary conditions ofK I =K I b =3.3 MPa $$\sqrt m$$ and the sufficiency condition ofr o =r c =0.75 mm were satisfied simultaneously. In the unsuccessful branching test, the necessary condition was not satisfied sinceK I was always less thanK I b .