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نتایج جستجو برای Orthotropic

تعداد نتایج: 731  
2010
X. Deng, S. Pellegrino,

This paper presents a simplified simulation technique for orthotropic viscoelastic films. Wrinkling is detected by a combined stress-strain criterion and an iterative scheme searches for the wrinkle angle using a pseudo-elastic material stiffness matrix based on a nonlinear viscoelastic constitutive model. This simplified model has been implemented in ABAQUS/Explicit and is able to compute the ...

2016
Y. García, Yasser B. Ruiz-Blanco, Yovani Marrero-Ponce, C. M. Sotomayor-Torres,

The control of electromechanical responses within bonding regions is essential to face frontier challenges in nanotechnologies, such as molecular electronics and biotechnology. Here, we present Iβ-nanocellulose as a potentially new orthotropic 2D piezoelectric crystal. The predicted in-layer piezoelectricity is originated on a sui-generis hydrogen bonds pattern. Upon this fact and by using a co...

Journal: :Numerical Lin. Alg. with Applic. 1996
Ivar Gustafsson, Gunhild Lindskog,

Finite element meshes and nodenumberings suitable for parallel solution with equally loaded processors are presented for linear orthotropic elliptic partial differential equations. These problems are of great importance for instance in oil and airfoil industry. The linear systems of equations are solved by the conjugate gradient method preconditioned by modified incomplete factorization, MIC. T...

2013
A. Khan, S. Islam,

The conditions that strain energy tensor and necessary condition on the roots of a constitutive equation must be positive definite produces some inequalities. These inequalities reduce the number of Rayleigh waves in orthotropic and transversely isotropic materials. Some earlier published work is found to be erroneous.

Journal: :CoRR 2015
Gautam Munglani, Roman Vetter, Falk K. Wittel, Hans J. Herrmann,

A method to simulate orthotropic behaviour in thin shell finite elements is proposed. The approach is based on the transformation of shape function derivatives, resulting in a new orthogonal basis aligned to a specified preferred direction for all elements. This transformation is carried out solely in the undeformed state leaving minimal additional impact on the computational effort expended to...

Journal: :Biomechanics and modeling in mechanobiology 2011
Yu Zou, Yanhang Zhang,

In this paper, we studied the viscoelastic behaviors of isolated aortic elastin using combined modeling and experimental approaches. Biaxial stress relaxation and creep experiments were performed to study the time-dependent behavior of elastin. Experimental results reveal that stress relaxation preconditioning is necessary in order to obtain repeatable stress relaxation responses. Elastin exhib...

2011
G. J. Nie, Z. Zhong, R. C. Batra,

Article history: Received 26 October 2010 Received in revised form 6 December 2010 Accepted 9 December 2010 Available online 14 December 2010

2006
Juraj Králik,

Abstract: The optimal control problems and a weight minimization problem are considered for elastic three-layered plate with inner obstacle and friction condition on a part of the boundary. The state problem is represented by a variational inequality and the design variables influence both the coefficients and the set of admissible state functions. We prove the existence of a solution to the ab...

2008
K. Bertoldi, D. Bigoni, W. J. Drugan,

A new micromechanical model for nacre (mother-of-pearl) is proposed, based on an accurate description of the actual microstructure of the material. In the small-strain regime (where damage and fracture are excluded), it is shown via homogenization techniques that the mechanical behaviour of nacre is: (i) orthotropic, with a strong difference in directional stiffnesses; (ii) bimodular (different...

2010
Seyed Majid Zabihzadeh,

The flexural properties of commercial bagasse-filled polyethylene (PE) and polypropylene (PP) composites were determined as a function of strain rate at room temperature. The applied strain rates were 1.5 ×10, 3.75×10, 7.5×10, and 1.5×10 s. The flexural modulus tended to increase linearly for the two types of composites with the logarithm of strain rate. The bending strength of polypropylene co...