Mechanics

Axisymmetric Stress Field Near a Circular Cut in a Solid with Stress State Dependent Plastic Properties

Authors: Lomakin E. V.

The paper analyzes the properties of the constitutive relations of the theory of plasticity for a continuum, which plastic properties depend on the type of stress state. The plasticity condition

Theory of Vibrations of Carbon Nanotubes Like Flexible Micropolar Mesh Cylindrical Shells Taking into Account Shift

Authors: Krylova E. Y., Papkova I. V., Yakovleva T. V., Krysko V. A.

A theory of nonlinear dynamics of a flexible single-layer micropolar cylindrical shell of a network structure is constructed. The geometric nonlinearity is taken into account by the model of Theodor von Karman. We consider a nonclassical continuum shell model based on the Cosserat medium with constrained particle rotation (pseudocontinuum). It is assumed that the displacement and rotation fields are not independent. An additional independent material length parameter associated with the symmetric tensor of the rotation gradient is introduced into consideration.

Threshold Values of Morphological Parameters Associated with Cerebral Aneurysm Rupture Risk

Authors: Dol A. V., Fomkina O. A., Ivanov D. V.

Numerous studies have shown that morphological parameters of aneurysms are associated with their rupture. However, literature data on the values of these parameters vary significantly. The objective of this study is to identify image-based morphological parameter values which correlate with cerebral aneurysm rupture and can be used during preoperative planning to detect aneurysms prone to rupture. Mean values of the morphological factors such as aspect ratio and size ratio were chosen from the literature. These factors were sampled for ruptured and unruptured aneurysms.