... of tunable PCs comprising periodic scatterers and periodic elastomeric matrix are proposed to effectively tune the band gaps and directionality of propagating waves. The orientation and arrangement of hard scatterers are controlled by the deformation of the periodic elastomeric matrix to enhance...

... for simulating incompressible fluid flows, and applicable to treating nonlinear constitutive laws of solid/membrane and large deformations. The temporal change of the solid deformation is described in the Eulerian frame by updating the advection equations for a left Cauchy-Green deformation tensor, which is used...

...Kenji Takizawa; Bradley Henicke; Anthony Puntel; Timothy Spielman; Tayfun E. Tezduyar We present the special space-time computational techniques we have introduced recently for computation of flow problems with moving and deforming solid surfaces. The techniques have been designed in the context...

...Peichao Li; Detang Lu An analytical solution is derived for the time-dependent flow and deformation coupling of a saturated isotropic homogeneous incompressible poroelastic media within a two-dimensional (2D) finite domain due to a point source at some arbitrary position. In this study, the pore...

...Dixie M. Hisley; James C. Gurganus; Andrew W. Drysdale As modern helmets have become quite capable of defeating the penetration capabilities of ballistic threats, Soldiers may experience head injuries due to blunt trauma caused by helmet back face deformation (BFD). Possible resulting injuries...

...James D. Walker; Sidney Chocron Fabrics are an extremely important element of body armors and other armors. Understanding fabrics requires understanding how yarns deform. Classical theory has shown very good agreement with the deformation of a single yarn when impacted transversely. However...

... simultaneously. The technique utilizes a cylindrical adapter that is fixed onto the blast pendulum into which a helical array of laser diode and receiver pairs are fitted. The output of the receivers is electronically coupled and a cascade voltage plot is obtained as the deforming plate interrupts the aligned...

... sources), the critical load for dislocation initiation is less than that of a defect-free medium and depends on dislocation source density, slip-plane distance, and indenter radius. The critical indenter radius resulting in deformation under the theoretical material strength is determined from numerical...

... reveals that the mechanism of the snap-through phenomenon is due to the convexity change in the constitutive curve of the softening part. 05 08 2010 02 03 2011 02 03 2011 14 04 2011 14 04 2011 deformation mechanical stability softening Strain-softening, i.e...

... of external pressure and axial load are taken into account. A nonlinear hypothesis of deformation of a plane cross section is formulated. The system of partial differential equations of motion for a shell is derived on the basis of Hamilton’s principle. The system of equations is analytically solved...

...C. Liu; R. K. N. D. Rajapakse; A. S. Phani A finite element formulation of a nonclassical beam theory based on the Gurtin–Murdoch model for continua with deformable elastic surfaces is presented. The governing equations for thin and thick beams are used together with a weighted residual formulation...

.... Proportional loading, total deformation theory of plasticity, and power law relation are assumed. Predicted limit strains for Hill’s zero and minimum extension of localized neck orientation is derived. The dominancy of zero extension and minimum extension on the left-hand side of FLDs for different work...

...J. D. Clayton A continuum model is developed for describing deformation and failure mechanisms in crystalline solids (ceramics and minerals) with the cubic spinel structure. The constitutive model describes the response under conditions pertinent to impact loading: high pressures, high strain rates...

...Ajeet Kumar; Subrata Mukherjee We present a novel approach for nonlinear, three dimensional deformation of a rod that allows in-plane cross-sectional deformation. The approach is based on the concept of multiplicative decomposition, i.e., the deformation of a rod’s cross section is performed in two...

..., with explicit formula for the true stress and tangent modulus at the current state of deformation and chemical potential. Such implementation enables numerical simulations of hydrogels swelling under various constraints. Several examples are presented, with both homogeneous and inhomogeneous swelling...

.... For lower D / t tubes, the two instabilities can be separated by strain levels of a few percent. Persistent stress-controlled cycling can cause accumulation of deformation by ratcheting. Here, the interaction of ratcheting and wrinkling is investigated. In particular, it is asked if compressive ratcheting...

...C. Pozrikidis; Haoxiang Luo The linear von Kármán equation describing the buckling of an elastic flat plate due to a distributed deformation-dependent load is discussed. It is shown that, in the case of buckling under the influence of an over-passing simple shear flow, a detailed hydrodynamic...

...J. Xiao; A. Carlson; Z. J. Liu; Y. Huang; J. A. Rogers The analytical solution is obtained for a semi-infinite linear elastic solid with a sinusoidal, “wavy” surface profile subject to applied strain. The amplitude A of a deformed wavy surface is related to the initial amplitude A 0 and the applied...

...Jia Lu; Xuefeng Zhao We present an innovative method for characterizing the distributive elastic properties in nonlinear membranes. The method hinges on an inverse elastostatic approach of stress analysis that can compute the wall stress in a deformed convex membrane structure using assumed elastic...

... of pressurized configurations, and a surface mesh that corresponds through all the deformed states is derived using a camera-based three dimensional reconstruction technique. In each configuration, the wall tension is computed by the finite element inverse elastostatic method, and the in-plane stretch relative...