A physical constitutive model is combined with a new function expression that describes the hardening behaviour of Shape Memory Alloys to enable accurate and efficient prediction partial transformations during cyclic thermo-mechanical loading. The reversal point memory associated wipe-out are successfully modeled for single transformation cycles by introducing pair interpolation functions scale martensitic volume fraction predicted original model. Isobaric, thermally induced, cycle...

Abstract Upscaling of wind turbine blades calls for implementation innovative active load control concepts that will facilitate the flawless operation machine and reduce fatigue ultimate loads hinder its service life. Based on aeroelastic simulations prove enhanced capabilities combined individual pitch flap at global scale level, a shape adaptive concept encompasses an articulated mechanism consisting two subparts is presented. Shape memory alloy (SMA) actuators are investigated assessed as...

Abstract This paper presents a unified modelling effort to describe partial phase transformation during cyclic thermo-mechanical loading in Shape Memory Alloys (SMA). To this purpose, three-dimensional (3D) finite strain constitutive model considering TRansformation-Induced Plasticity (TRIP) is combined with modified hardening function enable the accurate and efficient prediction of transformations loading. The capabilities proposed are demonstrated by predicting behavior material under...

The present article investigates and explores the effect of partial phase transformation on response shape adaptive/morphing structures controlled by memory alloy wire actuators subject to variable trajectory high actuation speed requirements, where becomes more dominant. A modified constitutive model is adopted for prediction thermo-mechanically coupled a trailing edge adaptive rib prototype intended active load alleviation in large wind turbine blades, simulated behavior subsequently...

The response of adaptive structures entailing shape memory alloy actuators is investigated both numerically and experimentally in this work. Emphasis placed on the inclusion large displacements rotations, as well thermomechanical coupling simulation actuators. Reduced multi-field beam finite element models for actuators, encompassing a co-rotational formulation capability to provide thermomechanically coupled transient response, are briefly overviewed. Prototypes two structure configurations...

Shape Memory Alloys (SMAs) constitute a class of materials that are distinguished by their highly non-linear, thermo-mechanically coupled behaviour which is related with the phenomena accompanying diffusion-less, solid-state phase transformation. This transition from parent Austenite to product Martensite and vice versa also bound uncommon characteristic "memory" exhibited when material undergoes variable thermo-mechanical loadings. When transformation reversal takes place, seems inherently...

The possibility of alleviating wind turbine loads through blade trailing edge shape morphing is investigated in the present paper. Emphasis put on analyzing effect flap geometry load reduction levels. choice deformation camber line as well chordwise and spanwise dimensions are addressed. analysis concerns conceptual DTU 10 MW RWT. Aeroelastic control materialized a standard individual controller. Furthermore, comb ined pitch-flap controller evaluated found to advantages compared only...

Multiple applications of shape memory alloys (SMA) involve operation under partial transformation (PT), where reversal the direction takes place while material is in a mixed phase state. Typical SMAs include: actuators adaptive/morphing structures which should repeatedly reach various target shapes or to follow time trajectories at higher rates; dampers vibrating pseudo-elastically varying amplitudes dynamic loads. While thermo-mechanically coupled behavior full has been studied during past...

Design and development of modern air vehicles seeks to produce airborne structures that are able fly in a wide range operational conditions with increased fuel efficiency reduced environmental impact. To be operate efficiently throughout the envelop these need adapt their aerodynamic characteristics, process achievable through introduction morphing regions. In this study, numerical investigation an autonomous camber helicopter blade is presented considering Shape Memory Alloy materials...

Abstract The authors present the automatic shape memory alloy data analyzer (ASMADA). ASMADA is capable of rapid, robust, and consistent processing thermal cycling acquired under constant stress. This seeks to address two primary issues: lack unified analysis procedures in relevant standards near-universal manual such data. compliant with definitions provided ASTM calculates up twenty-three (23) material properties/parameters at speeds ranging from 5 35 cycles s −1 . These parameters include...

Abstract Novel design of more efficient, environmentally friendly, quiet, and cost-effective air transportation could be substantially benefited by introducing highly adaptive, multi-functional systems that are able to mimic the operation biological systems, like birds. Altering Outer Mold Line (OML) an aircraft allows for achieving optimal response under a wide range operational conditions. In framework “Adaptive Aerostructures Revolutionary Civil Supersonic Transportation” project funded...

Shape memory alloys (SMA) provide common solid state actuators with reliable and unique characteristics. Their special behavior is based on a reversible phase transformation can high power density, induced strain block force which render them indispensable for use in morphing structures that require large shape changes while space weight restrictions are imposed. Yet, their implementation into faces challenges related to complex multi-disciplinary behavior, interaction the passive structural...

View Video Presentation: https://doi.org/10.2514/6.2021-1318.vid Realization of civil supersonic flights over inhabited areas could greatly alter the map air transportation by making a tremendous impact on commuting times for both business and leisure. Yet in order to achieve this goal loudness vehicles has be substantially reduced meet FAA regulations. Recent investigations effect morphing strategies sonic-boom signature aircraft suggest that small shape changes carefully selected locations...

Multifunctional capabilities of Shape Memory Alloys (SMAs) and, more specifically, their inherent characteristic producing and recovering transformation strain under thermal stimulus, render them ideal for actuator appli- cations. In fact, SMA actuators are widely used in various fields including but not limited to robotics, medical, civil, aerospace engineering. Moreover, they also able be formed a wide range shapes that includes, is to, wires, ribbons, bars, torque tubes spring types. This...

Abstract Novel morphing structures show high potential in various engineering applications where shape adaptivity is deemed essential to achieve the optimum functionality under a wide range of operational conditions. Shape memory alloys have been selected as main actuation elements large number research projects. However, successful design and realization concept highly dependent on accuracy available modeling tools that provide information response both actuator itself whole structure. To...