A novel approach for displacement and stress monitoring of sandwich structures based on the inverse Finite Element Method

Cerracchio, Priscilla; Gherlone, Marco; Sciuva, Marco Di; Tessler, Alexander

doi:10.1016/j.compstruct.2015.02.081

Cited by 100 publications

(63 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the robustness, effectiveness, and efficiency of the algorithm, many researchers performed a further study of the method and applied it in different structures. [29][30][31][32][33][34][35][36][37][38][39] However, the method requires different strain components of a measuring point, which brings challenge to the measure technique and the distribution of strain sensors.…”

Section: Introductionmentioning

confidence: 99%

Strain‐based displacement field reconstruction method for thin rectangular plate through orthogonal deflection curves bridging

Luo

Gao

et al. 2019

Struct Control Health Monit

View full text Add to dashboard Cite

Summary In the existing studies of strain‐based displacement field detection for thin rectangular plate, either the boundary conditions are too difficult to handle or the sensors layout and algorithm computing process are too complex to satisfy the requirement of rapid reconstruction of nonlinear vibration shape. In this paper, a strain‐displacement conversion method for reconstructing the deformed shape of rectangular plate with typical boundary conditions is presented. This method overcomes the above shortcomings for small deflection nonlinear vibration in linear elastic range. Strains measuring points are uniformly and regularly distributed in the middle area of the plate. Unmeasurable boundary strains will be estimated using the new derived formula according to quadratic interpolation of strains and boundary conditions. The principle of the proposed method is to bridge the orthogonal deflection curves by translating and rotating them. In this way, framework of displacement field can be formed. First, curvature integral method is employed to shape the orthogonal deflection curves of deformed plate. Then, the rotating angles and translating displacements are deduced according to boundary conditions. For some special boundary plates, it even needs to solve nonlinear optimization problem to get the rotating angles. The displacement field reconstructed by the proposed method shows great agreement with the finite element analyses results, which verifies the effectiveness of the methodology.

show abstract

Section: Introductionmentioning

confidence: 99%

Strain‐based displacement field reconstruction method for thin rectangular plate through orthogonal deflection curves bridging

Luo

Gao

et al. 2019

Struct Control Health Monit

View full text Add to dashboard Cite

show abstract

“…Sandwich structures are commonly used materials for lightweight designs, and their mechanical behaviors are based on their structural features: They are built from two layers, i.e., a stiff and strong skin layer, and a compliant and lightweight core layer [19]. There have been a number of applications in civil and military aircrafts, launch vehicles, wind turbine blades, and marine structures in which composite and sandwich material systems were used as primary structures [20]. Sandwich structures can often sustain large deformations under constant load, enabling them to absorb significant amounts of energy, and to have higher mechanical properties [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization Approach of a Large-Scale Moving Framework for a Large 5-Axis Machining Center

et al. 2018

View full text Add to dashboard Cite

The traditional machine tool design method with metal materials makes large-scale moving structures very heavy, which seriously impacts dynamic performance and results in significant energy consumption. Using sandwich structures of composite materials to replace metal materials is an important strategy for lightweight large-scale moving structures. However, this kind of substitution is generally believed to be difficult because foam-filled sandwich structures usually show nonlinear characteristics and must balance the moving mass, material costs, and structural stiffness. In the present study, we proposed a design optimization approach for a large-scale moving framework in a large 5-axis machining center (L5AMC) considering large dimensions in the x, y, and z work space and high machining speed with the aim of minimizing the displacements of the milling head. An improved approach, named the 3-step design optimization, was executed to obtain the optimum framework structures to solve the contradiction between the moving mass, material costs, and structural stiffness. This approach was based on multi-objective optimization and finite element analysis. The structural stiffness of the framework after optimization increased by 89% compared with before optimization although the mass increased by 6% and the material costs increased by 9%. A finite element simulation under four given operational loads showed that the displacements of the milling head were all less than the design requirement of 0.25 mm. The results indicated that the proposed 3-step design optimization approach for the optimal design of a large-scale moving framework was feasible and successful. A 40 m × 6 m × 4 m L5AMC prototype was manufactured, and the actual verification results indicated that the large-scale moving framework fully met the design requirements of the L5AMC and reduced energy consumption.

show abstract

“…Moreover, Tessler et al (2012) recently improved iMIN3 element formulation to reconstruct deformed shape of plate and shell structures undergoing large displacements. Furthermore, Cerracchio et al (2013Cerracchio et al ( , 2015 enhanced the Spangler (2003, 2005) iFEM formulation for shape-and stress-sensing of multi-layered composite and sandwich structures. They reformulated the original plate/shell iFEM formulation to include the kinematic assumptions of recently developed Refined Zigzag Theory by Tessler et al (2009Tessler et al ( , 2010.…”

Section: Introductionmentioning

confidence: 99%

Displacement and stress monitoring of a chemical tanker based on inverse finite element method

Kefal

Öterkuş

2016

Ocean Engineering

View full text Add to dashboard Cite

Real-time reconstruction of full field structural displacements, strains, and stresses by using surface strain measurements obtained from on-board strain sensors is commonly referred to as shape- and stress-sensing. For this purpose, a computationally accurate, robust, and rapid algorithm named as inverse Finite Element Method (iFEM) was recently developed. The main goal of this study is to perform displacement and stress monitoring of a typical chemical tanker mid-ship based on iFEM methodology. The numerical implementation of the iFEM algorithm is done by considering four-node inverse quadrilateral shell (iQS4) element. In order to demonstrate the capability of the current approach, a long barge that has a cross-section identical to a typical chemical tanker is modeled with iQS4 elements. Then, hydrodynamic loads of the barge for a certain frequency of waves are calculated by using in-house hydrodynamic software. Then, these forces are applied to a FEM model of barge and structural response is computed by using in-house finite element software. The results obtained from FEM analysis is utilized as a source to simulate in-situ strain data used in iFEM analysis as input. Finally, iFEM and FEM displacements are compared and the effects of locations and number of sensors on iFEM solution accuracy are discussed

show abstract

A novel approach for displacement and stress monitoring of sandwich structures based on the inverse Finite Element Method

Cited by 100 publications

References 38 publications

Strain‐based displacement field reconstruction method for thin rectangular plate through orthogonal deflection curves bridging

Strain‐based displacement field reconstruction method for thin rectangular plate through orthogonal deflection curves bridging

Design Optimization Approach of a Large-Scale Moving Framework for a Large 5-Axis Machining Center

Displacement and stress monitoring of a chemical tanker based on inverse finite element method

Contact Info

Product

Resources

About