Analysis of SMA Hybrid Composite Structures in MSC.Nastran and ABAQUS

Turner, Travis L.; Patel, Hemant

doi:10.1177/1045389x06066699

Cited by 26 publications

(21 citation statements)

References 20 publications

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“…and the corresponding root mean square (RMS) values of these same variables in the random response analysis. The same conclusion has been made in [9,10].…”

Section: Validationsupporting

confidence: 74%

“…It has been further demonstrated by Turner and Patel [9] that the thermal-acoustic analyses can be implemented in the commercial finite element codes, Abaqus or Nastran, and an excellent agreement with the research code [10] has been achieved by comparison as a validation of commercial FEM software implementations. Results were obtained based on an assumption that the structure will undergo small dynamic motions about a stable static shape.…”

Section: Introductionmentioning

confidence: 99%

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Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

Liu

Guo

2014

Advances in Mechanical Engineering

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In order to ensure integrity of thermal protection system (TPS) structure for hypersonic vehicles exposed to severe operating environments, a study is undertaken to investigate the response and thermal-acoustic fatigue damage of a representative multilayer TPS structure under combined thermal and acoustic loads. An unsteady-state flight of a hypersonic vehicle is composed of a series of steady-state snapshots, and for each snapshot an acoustic load is imposed to a static steady-state TPS structure. A multistep thermalacoustic fatigue damage intensity analysis procedure is given and consists of a heat transfer analysis, a nonlinear thermoelastic analysis, and a random response analysis under a combined loading environment and the fatigue damage intensity has been evaluated with two fatigue analysis techniques. The effects of thermally induced deterministic stress and nondeterministic dynamic stress due to the acoustic loading have been considered in the damage intensity estimation with a maximum stress fatigue model. The results show that the given thermal-acoustic fatigue intensity estimation procedure is a viable approach for life prediction of TPS structures under a typical mission cycle with combined loadings characterized by largely different time-scales. A discussion of the effects of the thermal load, the acoustic load, and fatigue analysis methodology on the fatigue damage intensity has been provided.

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“…and the corresponding root mean square (RMS) values of these same variables in the random response analysis. The same conclusion has been made in [9,10].…”

Section: Validationsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

Liu

Guo

2014

Advances in Mechanical Engineering

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“…That work also provided the first shape control experimental validation for a recently commercialized (MSC.Nastran and ABAQUS) constitutive model for SMAHC materials and structures [24][25][26][27] . The objectives of the present work are to design a SMAHC chevron with the cylindrical nozzle curvature, develop fabrication approaches for curved SMAHC chevron concepts, and perform bench-top testing of chevron prototypes for performance demonstration and correlation with numerical predictions.…”

Section: Introductionmentioning

confidence: 98%

Development of a SMA hybrid composite jet engine chevron concept

et al. 2007

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Control of jet noise continues to be an important research topic. Exhaust-nozzle chevrons have been shown to reduce jet noise, but parametric effects are not well understood. Additionally, thrust loss due to chevrons at cruise suggests significant benefit from active chevrons. The focus of this study is development of an active chevron concept for the primary purpose of parametric studies for jet noise reduction in the laboratory and technology development to leverage for full scale systems. The active chevron concept employed in this work consists of a laminated composite structure with embedded shape memory alloy (SMA) actuators, termed a SMA hybrid composite (SMAHC). SMA actuators are embedded on one side of the bending axis of the structure such that thermal excitation generates a moment and deflects the structure. Two active chevron concepts are demonstrated; one that is powered to immerse and one that is powered to retract. A brief description of the chevron designs is followed by details of the fabrication approach. Results from bench-top tests are presented and correlated with predictions from a numerical model. Very repeatable performance is achieved with excellent agreement between predicted and measured results. Although the deflection requirement is not achieved in the presented results, the approach to meeting the performance requirement is evident.

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“…That work also provided the first experimental validation of a commercially available (MSC.Nastran and ABAQUS) constitutive model for SMAHC materials and structures for shape-control applications [26]- [28] . Recent work extended that active chevron concept to include the cylindrical radius of curvature.…”

Section: Introductionmentioning

confidence: 99%

Testing of SMA-enabled active chevron prototypes under representative flow conditions

et al. 2008

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Control of jet noise continues to be an important research topic. Exhaust-nozzle chevrons have been shown to reduce jet noise, but parametric effects are not well understood. Additionally, thrust loss due to chevrons at cruise suggests significant benefit from active chevrons. The focus of this study is development of an active chevron concept for the primary purpose of parametric studies for jet noise reduction in the laboratory and secondarily for technology development to leverage for full scale systems. The active chevron concept employed in this work consists of a laminated composite structure with embedded shape memory alloy (SMA) actuators, termed a SMA hybrid composite (SMAHC). SMA actuators are embedded on one side of the neutral axis of the structure such that thermal excitation, via joule heating, generates a moment and deflects the structure. The performance of two active chevron concepts is demonstrated in the presence of representative flow conditions. One of the concepts is shown to possess significant advantages for the proposed application and is selected for further development. Fabrication and design changes are described and shown to produce a chevron prototype that meets the performance objectives.

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Analysis of SMA Hybrid Composite Structures in MSC.Nastran and ABAQUS

Cited by 26 publications

References 20 publications

Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

Development of a SMA hybrid composite jet engine chevron concept

Testing of SMA-enabled active chevron prototypes under representative flow conditions

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