Modeling, Fabrication, and Testing of a SMA Hybrid Composite Jet Engine                 Chevron Concept

Turner, Travis L.; Buehrle, Ralph D.; Cano, Roberto J.; Fleming, Gary A.

doi:10.1177/1045389x06058795

Cited by 59 publications

(33 citation statements)

References 16 publications

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“…9 The SAMPSON F-15 inlet cowl as installed in the NASA Langley Transonic Wind Tunnel [20] strips during chevron laminate fabrication. The strips are installed on each side of the chevron centroid [30]. Upon sufficient heating, the SMA elements contract and this leads to asymmetric stresses within the beam and thus an effective internal bending moment.…”

Section: Fixed-wing Aircraft and Rotorcraft Applicationsmentioning

confidence: 99%

Aerospace applications of shape memory alloys

Hartl

Lagoudas

2007

Proceedings of the Institution of Mechanical Engineers, Part G:

724

336

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With the increased emphasis on both reliability and multi-functionality in the aerospace industry, active materials are fast becoming an enabling technology capturing the attention of an increasing number of engineers and scientists worldwide. This article reviews the class of active materials known as shape memory alloys (SMAs), especially as used in aerospace applications. To begin, a general overview of SMAs is provided. Their useful properties and engineering effects are described and the methods in which these may be utilized are discussed. A review of past and present aerospace applications is presented. The discussion addresses applications for both atmospheric earth flight as well as space flight. To complete the discussion, SMA design challenges and methodologies are addressed and the future of the field is examined.

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Section: Fixed-wing Aircraft and Rotorcraft Applicationsmentioning

confidence: 99%

Aerospace applications of shape memory alloys

Hartl

Lagoudas

2007

Proceedings of the Institution of Mechanical Engineers, Part G:

724

336

View full text Add to dashboard Cite

show abstract

“…Previous work by the present authors demonstrated the feasibility of the active SMAHC chevron concept [23][24][25] . 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 [25][26][27][28] .…”

Section: Introductionmentioning

confidence: 96%

“…Previous work at NASA LaRC presented a fabrication approach, test results, and validation of a numerical model for a SMAHC chevron concept with a single embedded actuator assembly 23,25 . It was found that the single actuator assembly provided insufficient actuation authority and limitations of the fabrication approach dictated development of a new procedure for embedding multiple actuators.…”

Section: Smahc Chevron Fabricationmentioning

confidence: 99%

“…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 [25][26][27][28] . However, deflection performance of the SMAHC chevron fell short of the requirement and shortcomings in the fabrication approach were identified.…”

Section: Introductionmentioning

confidence: 99%

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Design, fabrication, and testing of a SMA hybrid composite jet engine chevron

et al. 2006

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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 deployable 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). The actuators are embedded on one side of the middle surface such that thermal excitation generates a moment and deflects the structure. A brief description of the chevron design is given followed by details of the fabrication approach. Results from bench top tests are presented and correlated with numerical predictions from a model for such structures that was recently implemented in MSC.Nastran and ABAQUS. Excellent performance and agreement with predictions is demonstrated. Results from tests in a representative flow environment are also presented. Excellent performance is again achieved for both open-and closed-loop tests, the latter demonstrating control to a specified immersion into the flow. The actuation authority and immersion performance is shown to be relatively insensitive to nozzle pressure ratio (NPR). Very repeatable immersion control with modest power requirements is demonstrated.

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“…Previous work by the present authors demonstrated the feasibility of the active SMAHC chevron concept using a flat prototype, i.e., without the cylindrical radius of curvature [24], [25] . 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] .…”

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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Modeling, Fabrication, and Testing of a SMA Hybrid Composite Jet Engine Chevron Concept

Cited by 59 publications

References 16 publications

Aerospace applications of shape memory alloys

Aerospace applications of shape memory alloys

Design, fabrication, and testing of a SMA hybrid composite jet engine chevron

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

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