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Surface instability of a semi-infinite isotropic laminated plate under surface van der Waals forces

Wang X., Xu Y., Zhou K.

Archives of Mechanics

2015

Vol. 67, nr 2

137--155

By means of complex variable method, the present work demonstrates that the surface of a semi-infinite isotropic laminated plate that is being attracted to a rigid contactor through van der Waals forces is always unstable. Two distinct surface instability modes are identified, and their wavenumbers and wavelengths are presented in concise and simple expressions. Furthermore, the two wavenumbers and wavelengths are completely determined by three elastic parameters of the laminated plate, three parameters related to the interactions between the surface and the contactor, and three parameters related to surface energy.

Negative Stiffness Demonstrated by NiAl Nanofilms

Babicheva R. I., Bukreeva K. A., Dmitriev S. V., Mulyukov R. R., Zhou K.

Computational Methods in Science and Technology

2013

Vol. 19, No. 3

127--135

This paper studies the uniaxial strain control tension of NiAl nanofilms via molecular dynamics simulations. The nanofilm deforms elastically until fracture at tensile strain is as large as 37%. The stress-strain curve has a range where tensile deformation develops at decreasing tensile stress, thus indicating negative stiffness. Such deformation is thermodynamically unstable and the nanofilm splits into domains with two different values of elastic strain. Deformation within the unstable range is controlled by motion of the domain walls, resulting in the domains with larger strain grow at the expense of the domains with smaller strain.