The present study deals with static modeling and analysis of a novel electro-pneumatic braided muscle (EPBM) actuator. EPBM actuator is hybrid McKibben-type actuator, made dielectric polymeric bladder enclosed in mesh sleeve. A continuum mechanics-based electromechanical model developed to predict the response for combined pressure voltage loading. also incorporates braid-to-braid frictional effects. agrees well existing experimental results special case zero input voltage. Parametric...

Wearable robotic devices are designed to assist, enhance or restore human muscle performance. Understanding how a wearable device changes biomechanics through complex interaction is important guide its proper design, parametric optimization and functional success. The present work develops human-machine-interaction simulation platform for closed loop dynamic analysis with feedback control study the effect of soft-robotic wearables on physiology. proposed incorporates Computed Muscle Control...

This paper presents a computationally efficient constitutive model for magnetostrictive materials. High computational efficiency is achieved through the use of local linearization (about easy axes) and discrete energy-averaging techniques. The applied to iron-gallium alloys (Galfenol) tested different magnetic field orientations relative axes. It observed that accurately predicts both sensing actuation characteristics while reducing computation time by large factor (>1000 times) when...

A unified thermodynamic framework for the characterization of functional materials is developed. This encompasses linear reversible and irreversible processes with thermal, electrical, magnetic, and/or mechanical effects coupled. The comprehensive combines principles classical equilibrium non-equilibrium thermodynamics electrodynamics continua in infinitesimal strain regime.In first part this paper, Thermo-Electro-Magneto-Mechanical (TEMM) quasistatic are characterized. Thermodynamic...

This paper presents a computationally efficient and robust nonlinear modeling framework for smart materials. The describes material system through new 3D inversion scheme coupled constitutive equations which can be integrated with the variational form of governing equations. Building on Newton technique, applied to any differentiable direct model. To further improve computational efficiency, is reduced dimensional (2D) model composite structures. resulting 2D an aluminum-Galfenol plate that...

This work presents the development of a 2D nonlinear magnetoelastic framework for thin membrane undergoing large deformations. An asymptotic [Formula: see text] theory is obtained, starting from 3D variational magnetostatic and force balance equations weakly magnetizable material. The model subsequently specialized to axisymmetry applied pre-stretched annular deforming under azimuthal magnetic field transverse pressure loading. Parametric studies are performed by varying pre-stretch, field, inputs.

This paper (i) presents a mathematical approach to formulate leading-order models for complex multifunctional systems with coupled thermomechanical and electromagnetic field interactions, (ii) demonstrates its applicability the modeling analysis of load-bearing antenna, sensing transmitting device integrated structure. Starting from first-principle equations, i.e. balance laws Maxwell's nondimensionalization perturbation techniques are employed model system. Depending on design structure...

This paper presents an asymptotic two-dimensional (2D) finite-deformation theory for a thin magnetoelastic sheet starting from three-dimensional (3D) variational form. is used to model wrinkling phenomena under applied traction and external magnetic field. The resulting 2D potential energy specialized isotropic, in compressible material, the expressions material constants, i.e., elasticity tensor, coupling constant, permeability, are obtained as function of formulation further simplified...

Abstract This work presents the development of a nonlinear 2D finite element (FE) framework for magnetostrictive material based energy harvesters beam geometry. The FE model is developed in COMSOL Multiphysics and compared with existing literature validation. subsequently used to study effect closed magnetic flux path, consisting ferromagnetic components, on harvester output. Specifically, voltage output obtained by performing simulations unimorph type devices without both operating at same...

This work presents an experimental and analytical study of a negative magnetoelectric (ME) effect observed in Fe substituted Bi0.5Na0.5TiO3 (BNT). Experiments are performed on solid solutions Bi0.5Na0.5(FexTi(1 − 3x/4))O3 (BNFT), for x = 0 to 0.2, synthesized using the conventional state reaction route. X-ray diffraction studies confirm that ions completely soluble BNT matrix, up highest solubility thus forming single-phase perovskite structure. As expected, partial substitution at Ti4+...

Load-bearing antennas are multi-functional sensing (actuating) and receiving (detecting) devices that integrated with a load-bearing structure. These appealing for military applications, importantly Unmanned Aerial Vehicles (UAV). The antenna structure is subjected to mechanical forces, temperature gradients, electromagnetic fields, giving rise highly-coupled nonlinear thermo-electro-magneto-mechanical (TEMM) behavior. In the present work, we have developed analytical techniques...

Abstract This work presents the development of a unified gradient electromechanical theory for thin flexoelectric beams considering both direct and converse effects. The two-way coupled is developed starting from 3D variational formulation by an electric field-strain based free energy function. incorporates mechanical as well electrical size specialized to isotropic materials 1D beam composite curved derived using classical Kirchhoff assumptions. solved novel C2 continuous finite element...

Abstract In the present work, a nonlinear coupled electro-magneto-elastic membrane formulation is developed for soft functional materials starting from variational form of 3D governing equations. The resulting 2D model applied to an internally pressurized cylindrical placed in azimuthal magnetic field and radial electric field. results our are verified with existing literature some special cases. subsequently used analyze mechanical electrical limit-point instabilities, effect external...

Soft exosuits are wearable robotic devices that assist or enhance the human muscle performance. A machine interface simulation platform based on MATLAB-OpenSim is developed in this paper for closed loop dynamic with feedback control strategy and to study its effect physiology. The proposed model Computed Muscle Control (CMC) algorithm implemented using MATLAB -OpenSim interface. Gravity Compensation (GC) controller has been external device resulting decrease physiological torques,...