Shape sensing of multilayered composite and sandwich beams based on Refined Zigzag Theory and inverse finite element method

2020 ◽  
pp. 113321
Author(s):  
Feifei Zhao ◽  
Hong Bao ◽  
Jianfeng Liu ◽  
Kexiang Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sandwich Beams ◽  
Multilayered Composite ◽  
Inverse Finite Element Method ◽  
Shape Sensing ◽  
Zigzag Theory ◽  
Element Method

scholarly journals Shape Sensing of a Complex Aeronautical Structure with Inverse Finite Element Method

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1388
Author(s):  
Daniele Oboe ◽  
Luca Colombo ◽  
Claudio Sbarufatti ◽  
Marco Giglio
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Strain Field ◽  
Element Analysis ◽  
Inverse Finite Element Method ◽  
Shape Sensing ◽  
Definition Of ◽  
High Level ◽  
Element Method

The inverse Finite Element Method (iFEM) is receiving more attention for shape sensing due to its independence from the material properties and the external load. However, a proper definition of the model geometry with its boundary conditions is required, together with the acquisition of the structure’s strain field with optimized sensor networks. The iFEM model definition is not trivial in the case of complex structures, in particular, if sensors are not applied on the whole structure allowing just a partial definition of the input strain field. To overcome this issue, this research proposes a simplified iFEM model in which the geometrical complexity is reduced and boundary conditions are tuned with the superimposition of the effects to behave as the real structure. The procedure is assessed for a complex aeronautical structure, where the reference displacement field is first computed in a numerical framework with input strains coming from a direct finite element analysis, confirming the effectiveness of the iFEM based on a simplified geometry. Finally, the model is fed with experimentally acquired strain measurements and the performance of the method is assessed in presence of a high level of uncertainty.

scholarly journals Shape Sensing of Plate and Shell Structures Undergoing Large Displacements Using the Inverse Finite Element Method

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Alexander Tessler ◽  
Rinto Roy ◽  
Marco Esposito ◽  
Cecilia Surace ◽  
Marco Gherlone
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Sensors ◽  
Displacement Curve ◽  
Large Displacements ◽  
Plate And Shell ◽  
Inverse Finite Element Method ◽  
Nonlinear Character ◽  
Shape Sensing ◽  
Element Method

The inverse Finite Element Method (iFEM) is applied to reconstruct the displacement field of a shell structure which undergoes large deformations using discreet strain measurements as the prescribed data. The iFEM computations are carried out using an incremental procedure where at each load step, the incremental strains are used to evaluate the incremental displacements which in turn update the geometry of the deformed structure. The efficacy of the proposed approach to predict large displacements is examined using two case studies involving a cantilevered wing-shaped plate and a clamped plate. The incremental iFEM procedure is demonstrated to be sufficiently accurate in terms of reproducing the correct nonlinear character of the load-displacement curve even when a reduced number of strain sensors is used. Therefore, this approach may have important implications for real-time monitoring of aerospace structures that undergo large displacements.

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