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- W2007693993 abstract "The development of mullions at single and double interfaces bounding single layers has been modelled by shortening interfaces or layers with initial irregularities at nearly constant strain rates. The experiments involved a low bulk viscosity ratio, m ≌ 12 in strain-rate softening materials, in which a mixture of barium sulphate + silicone putty (viscosity, ηL = 2.5 × 106 Pa s and power law exponent n ≌ 3) represented the incompetent material of the layer, and a Plastilina + silicone putty mixture (ηH = 5.5 × 106 Pa s and n ≌ 7.1) represented the more competent host material.The key feature of this experimental work was the study of the growth rates of initially nearly sinusoidal perturbations at finite strains. Initial irregularities in the single interface amplified unexpectedly fast at constant rates until ∼ 15% bulk shortening (BS), but showed no tendency to develop a dominant wavelength.Only one of the contacts of the incompetent single layers was given initial sinusoidal irregularities. This geometric form was chosen in order to see whether the planar interface favoured the development of symmetric or antisymmetric mullions. The two initially asymmetric interfaces failed to interact and showed no tendency to develop a dominant wavelength. However, a tendency towards antisymmetric fold mullions appeared at ∼ 20% bulk shortening and further shortening (∼ 40% BS) led to the same mullion products (i.e. ‘flames’, etc.) already described by the author in incompetent single layers with much larger viscosity contrasts. The final geometry of mullions from ∼ 40% BS and above, appeared to be independent of viscosity contrast. Mullions amplified dynamically only up to ∼ 30% shortening and then the soft material started to move back into the main body of the incompetent layer as the mullions ‘closed up’." @default.
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- W2007693993 title "Experimental mullions at single and double interfaces" @default.
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- W2007693993 doi "https://doi.org/10.1016/0191-8141(90)90020-y" @default.
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