Characterization of the guided wave propagation in simplified foam, honeycomb and hollow sphere structures

Hosseini, Seyed Mohammad Hossein; Willberg, Christian; Kharaghani, Abdolreza; Gabbert, Ulrich

doi:10.1016/j.compositesb.2013.08.077

Cited by 25 publications

(14 citation statements)

References 31 publications

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“…feature size ranges from 0.1mm to 10mm) have received considerable attention. Due to the excellent properties of lattice structures, they can be designed for multiple purposes, such as weight reduction, energy absorption, heat transfer, thermal protection and insulation [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Evolutionary Structural Optimization (BESO) based design method for lattice structure to be fabricated by additive manufacturing

Tang

Kurtz

Zhao

2015

Computer-Aided Design

141

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Please cite this article as: Tang Y, Kurtz A, Zhao YF. Bidirectional Evolutionary Structural Optimization (BESO) based design method for lattice structure to be fabricated by additive manufacturing. Computer-Aided Design (2015), http://dx. AbstractUnlike traditional manufacturing methods, additive manufacturing can produce parts with complex geometric structures without significant increases in fabrication time and cost. One application of additive manufacturing technologies is the fabrication of customized lattice-skin structures which can enhance performance of products while minimizing material or weight. In this paper, a novel design method for the creation of periodic lattice structures is proposed. In this method, Functional Volumes (FVs) and Functional Surfaces (FSs) are first determined based on an analysis of the functional requirements. FVs can be further decomposed into several subFVs. These sub-FVs can be divided into two types: FV with solid and FV with lattice. The initial design parameters of the lattice are selected based on the proposed guidelines. Based on these parameters, a kernel based lattice frame generation algorithm is used to generate lattice wireframes within the given FVs. At last, traditional bidirectional evolutionary structural optimization is modified to optimize distribution of lattice struts' thickness. The design method proposed in this paper validated through a case study, and provides an important foundation for the wide adoption of additive manufacturing technologies in the industry.

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Section: Introductionmentioning

confidence: 99%

Bidirectional Evolutionary Structural Optimization (BESO) based design method for lattice structure to be fabricated by additive manufacturing

Tang

Kurtz

Zhao

2015

Computer-Aided Design

141

View full text Add to dashboard Cite

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“…At the edge of the defect, the amplitude increases due to mode conversion and interference between the directly propagating waves and waves re°ected from the boundary of the defect. 5,10,13,18 Another parameter which is related to the presence of structural nonhomogeneities is the velocity of UGW. One of the well-known methods which can be used for the measurements of phase velocity variations is the zero-crossing method.…”

Section: Simulation Of Guided Waves Propagating Along a Honeycomb Sanmentioning

confidence: 99%

“…[9][10][11][12] There have been many studies carried out related to UGW methods showing their advantages over other NDT techniques. [13][14][15][16][17] However, in the case when the internal structure of the multilayered material is not uniform nor known, the excitation and interpretation of the UGW signals received become very complicated and very sensitive to the adjustment of operating parameters of the experimental set-up (type of the excited modes of UGW, operation frequency etc.). 5,18,19 And,¯rst of all, before using the UGW for defect detection, the knowledge about the UGW propagation e®ects in a selected structure is required.…”

Section: Introductionmentioning

confidence: 99%

An Adjustment-Free NDT Technique for Defect Detection in Multilayered Composite Constructions Using Ultrasonic Guided Waves

Samaitis

2014

Int. J. Str. Stab. Dyn.

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In recent years, the novel lightweight honeycomb sandwich structures have been applied in a wide range of industries. However, daily operational conditions, fatigue, as well as various defects developed during exploitation lead to the risk of structure failure. To meet safety and economical requirements, such structures must be tested. In this paper, an ultrasonic pitchcatch technique based on ultrasonic guided waves (UGW) for detection of defects in honeycomb sandwich structures is proposed. The technique is based on simultaneous scanning of a pair of contact type transmitting and receiving transducers positioned at¯xed distance from each other. The proposed technique has been veri¯ed by the experiments and simulations on a honeycomb sandwich structure with an aluminium core and carbon¯ber skin. The results have shown that di®erent types of internal nonhomogeneities, such as changes in internal multilayered structure, skin delaminations or disbonds between the skin and the core, give the e®ects of amplitude and phase velocity deviations, which can be detected with accuracy reasonable for practical applications.

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“…Hence, finite element models, with the detail of geometry developed by commercial finite element software, e.g., LS-DYNA, ABAQUS, etc., have been used to solve the GW propagation problem in HSSs [ 15 ]. As a result of the complex structures of HSSs, the geometry of HSSs [ 26 ] is commonly simplified or equivalent parameters are used [ 27 ], rather than actual structural parameters, to reduce computing costs. However, in so doing, the dynamic of honeycomb cells in HSSs is ignored.…”

Section: Introductionmentioning

confidence: 99%

Wave Propagation in Aluminum Honeycomb Plate and Debonding Detection Using Scanning Laser Vibrometer

Zhao

Cao

et al. 2018

Sensors

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Both the aerospace and marine industry have widely relied on a honeycomb sandwich structure (HSS) because of its high strength-to-weight ratio. However, the intrinsic nature of an adhesively bonded multi-layer structure increases the risk of debonding when the structure is under strain or exposed to varying temperatures. Such defects are normally concealed under the surface but can significantly compromise the strength and stiffness of a structure. In this paper, the guided wave method is used to detect debondings which are located between the skin and the honeycomb in sandwich plates. The propagation of guided waves in honeycomb plates is investigated via numerical techniques, with emphasis placed on demonstrating the behavior of structure-based wave interactions (SWIs). The SWI technique is effective to distinguish heterogeneous structures from homogeneous structures. The excitation frequency is necessary to generate obvious SWIs in HSSs; accordingly, a novel strategy is proposed to select the optimal excitation frequencies. A series of experiments are conducted, the results of which show that the presented procedure can be used to effectively detect the locations and the sizes of single- and multi-damage zones in HSSs.

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Characterization of the guided wave propagation in simplified foam, honeycomb and hollow sphere structures

Cited by 25 publications

References 31 publications

Bidirectional Evolutionary Structural Optimization (BESO) based design method for lattice structure to be fabricated by additive manufacturing

Bidirectional Evolutionary Structural Optimization (BESO) based design method for lattice structure to be fabricated by additive manufacturing

An Adjustment-Free NDT Technique for Defect Detection in Multilayered Composite Constructions Using Ultrasonic Guided Waves

Wave Propagation in Aluminum Honeycomb Plate and Debonding Detection Using Scanning Laser Vibrometer

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