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This treatise provides a broad overview of the definitions of
fundamental quantities and methods of analysis for the use of solid materials
in structural components. The presentation is limited to the linear elastic
range of material behavior where there is a one to one relationship between
load and displacement.  Fundamental
methods of analysis and typical results for structures made of elastic solid materials
subjected to axial, bending, torsion, thermal, and internal pressure loading;

 Nature Publishing Index - 2012 Global Top 200

Hi friends,

 Does anybody know what this error mean?

The general contact definition is empty. The definition must include at least one surface. If *CONTACT EXCLUSIONS was defined, check whether the *CONTACT EXCLUSIONS option was specified correctly. Additionally, check whether PURE MASTER-SLAVE formulation is applied to any self-contact situations.

http://jap.aip.org/resource/1/japiau/v113/i19/p193501_s1 

The paper presents a thermodynamically consistent modeling of the non-linear multiphysics of ionic polymer gels based on the multiplicative decomposition of the deformation gradient. In particular, the deformations induced by the motion of ions under an applied voltage are viewed as distortions, similarly to growth-induced deformations in soft tissues. Furthermore, a consistent linearization of the model in the regime of small deformations is discussed. Finally, a finite element implementation of the theory is introduced and validated against experimental results.

I am finding difficulties to obatain the mode shape from Frequency Response Function (FRF). Let know me the brief procedure in the modal analysis. 

   The new impact factor of Acta Mechanica Solida Sinica (AMSS) is 1.330, as revealed in the 2012 Journal Citation Reports published by Thomson Reuters. This is the third consecutive increase in Impact Factor of the journal.