Simulation of constrained layered damped laminated plates subjected to low-velocity impact using a quasi-static method

Luo, Guang-Min; Lee, Ya‐Jung

doi:10.1016/j.compstruct.2008.04.009

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…-Curve Force/Ki, for Graphite/Epoxy The results are consistent with those reported in the literatures [19,20]. The following graphs (Figures 24 and 25) present the variation of Ki and J-integral around a crack tip for the three different fracture modes depending on the tensile load in the case of a Graphite/Epoxy patch.…”

Section: Simulations Graphite/epoxy Patch Resultssupporting

confidence: 89%

Numerical Simulation of Asymmetric Composite Patch Repair for Fatigue Damaged Aluminum Plate

Salim,

Imane,

Ahmed

2023

RCMA

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Repairing structures damaged by fatigue through the use of composite patch bonding is an efficient and economical process to preserve structures and increase their lifespan. Much work is currently being carried out to improve this technique. In this work, a 3D nonlinear numerical simulation by finite element analysis was carried out to study the behavior of the crack front and determine the evolution of the stress intensity factor and the change of stresses with respect to distance from the crack point. for an aluminum alloy plate containing a central crack, repaired asymmetrically with a composite patch. The repair of these plates must be more precise and reinforced around the crack point, therefore the stresses are high and the stress integrity factor SIF is more important according to the results of this study.

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Section: Simulations Graphite/epoxy Patch Resultssupporting

confidence: 89%

Numerical Simulation of Asymmetric Composite Patch Repair for Fatigue Damaged Aluminum Plate

Salim,

Imane,

Ahmed

2023

RCMA

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“…2) CLD Failure Constraint CLD is composed of damping material and thin metal. As identified in Luo [16], damping failure occurs subsequent to thin metal failure when a material is affected by impact load. Consequently, when investigating CLD failure, only thin metal failure was considered.…”

Section: Objective Functionmentioning

confidence: 98%

Optimum Design for CLD Laminate Plates Using Genetic Algorithms

Luo¹,

Hsieh²

2014

OJCM

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The optimizations of constrained layered damped (CLD) laminated structures are discussed in this study. Genetic algorithms (GAs) are employed as the search tool for optimization because these algorithms are suitable for solving optimization problems involving multiple discrete variable combinations. The numerical computation packages, ANSYS and MATLAB, have been used to estimate the optimum stacking sequence of CLD laminated structures. MATLAB package is used to achieve GAs process, and ANSYS package is used to proceed the structural analysis. This study successfully developed a numerical simulation mechanism for optimizing CLD adhesion efficiency by implementing GAs and the finite element method. The loss coefficients of the CLD damping layer vary with vibration frequency and failure constraints of CLD laminated plates are considered in objective function. In addition, the modified plasticity analysis (MPA) is used to increase the search efficiency of GAs and simply plastic analysis.

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“…Zheng et al [27] used a genetic algorithm to solve optimization problems involving a CLD structure, changing the position and length of the CLD structure to minimize vibrations in beams. Through finite element analysis and theoretical derivation, Luo [28,29] examined the low-speed impact characteristics of FRP-laminated plates employing CLD and derived a vibration equation for the uniform impact load sustained by the CLD plates. Granger et al [30] studied the transient vibration behavior on the millisecond timescale of beams partially employing CLD and discovered that the CLD attachment length exerted significant mitigating effects on the initial transient displacements of the beams, whereas the thickness of the viscoelastic layer had limited mitigating effects.…”

Section: Journal Of Mechanical Design and Vibrationmentioning

confidence: 99%

“…Figure 2 depicts the use of CLD. On the basis of [28], this study used Eq. (1) to describe the relationship between the shear stress and strain on the viscoelastic gel when it undergoes shear deformation.…”

Section: Constrained-layer Dampingmentioning

confidence: 99%

Constrained-layer Damping Applied to DCJ Vibration Isolation Design

Luo¹

2017

JMDV

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A dual piezoelectric cooling jet (DCJ) is an innovative cooling device that uses piezoelectric materials to generate high-speed vibrations, thereby causing changes in the flow field to achieve heat exchange. Despite its high cooling efficiency, a DCJ transfers vibrations through its supporting base to its peripheral devices. To attenuate vibrations from DCJs, this study employed constrained-layer damping (CLD)-a technique for suppressing vibrations-to develop a base for cooling devices and to propose a C-DCJ model. ANSYS simulation of the vibrations of a DCJ and the C-DCJ suggested that, under the same vibration conditions and with the same levels of cooling efficiency, the amplitude and acceleration of the base on the C-DCJ were 30%-50% lower than that on the DCJ. Thus, the proposed C-DCJ effectively isolated vibration transfer.

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Simulation of constrained layered damped laminated plates subjected to low-velocity impact using a quasi-static method

Cited by 8 publications

References 9 publications

Numerical Simulation of Asymmetric Composite Patch Repair for Fatigue Damaged Aluminum Plate

Numerical Simulation of Asymmetric Composite Patch Repair for Fatigue Damaged Aluminum Plate

Optimum Design for CLD Laminate Plates Using Genetic Algorithms

Constrained-layer Damping Applied to DCJ Vibration Isolation Design

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