Dynamic Responses of Composite Sandwich Plate Impacted by a Rigid Ball*

Lee, L.J.; Huang, Kuo Yuan; Fann, Yih-Fen

doi:10.1177/002199839302701301

Cited by 56 publications

(30 citation statements)

References 13 publications

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“…In particular, the impact damage of sandwich structures due to a drop weight has not been fully analyzed, which is actually very important in utilizing these sandwich systems properly. The impact over sandwich systems was first analyzed by Lee et al (1993). In their study, an anti-plane sandwich theory was used, and the transient contact force and central deflection histories were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Higher-order impact modeling of sandwich structures with flexible core

Yang

Qiao

2005

International Journal of Solids and Structures

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In this study, a higher-order impact model is presented to simulate the response of a soft-core sandwich beam subjected to a foreign object impact. A free vibration problem of sandwich beams is first solved, and the results are validated by comparing with numerical finite element modeling results of ABAQUS and the solution by Frostig and Baruch [Frostig, Y., Baruch, M., 1994. Free vibration of sandwich beams with a transversely flexible core: a high order approach. Journal of Sound and Vibration 176(2), 195-208]. Then a foreign object impact process is incorporated in the higher-order model, and the contact force and deflection history as well as the propagation of transverse normal, shear, and axial stresses during the impact are analyzed and discussed. The validity of the model in the impact response predictions is demonstrated by comparing with finite element solutions of LS-DYNA. The calculated stresses caused by a foreign object impact are then used to assess failure locations, failure time, and failure modes in sandwich beams, which are shown to compare well with the available experimental results. The effects of impact mass, initial velocity, core stiffness, and core height on the impact stresses generated in the beams are discussed. The influences of impact mass and initial velocity on the contact force history are close to those by the linearized impact solution, but the proposed higherorder impact model captures the non-linear impact process and different generated stresses. Compared to the fully backed sandwich case, the core height shows a great influence over the impact process of a simply supported sandwich system, in which the global behavior of the sandwich is dominant; while the core stiffness shows minor effect over the impact process. The higher-order impact model of sandwich beams developed in the study provides accurate predictions of the generated stresses and impact process and can be used effectively in design analysis of anti-impact structures made of sandwich materials.

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Section: Introductionmentioning

confidence: 99%

Higher-order impact modeling of sandwich structures with flexible core

Yang

Qiao

2005

International Journal of Solids and Structures

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“…Following this, in the second region, the load gradually dropped and remained constant, which corresponded to the point where the indenter was perforating the foam core. This force was greatly dependent on the fracture properties of the core [24,25]. Lastly, the third region was a final peak, which was associated with failure of the lower composite skin [26].…”

Section: Resultsmentioning

confidence: 98%

Perforation behaviour of composites sandwich structures on low-velocity impact at oblique angles

Fadzullah¹,

Ifayefunmi²,

Mustafa³

et al. 2017

Int. J. Automot. Mech. Eng.

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This paper presents the perforation behaviour of polyethylene terephthalate (PET) foam cored sandwich structures when subjected to quasi-static and dynamic loading at normal (0°) and oblique angles of 10° and 20°. An instrumented drop-weight hammer rig was used with fully-clamped conditions for the low-velocity impact test with impact energy of 40 J and velocity of 3.78 m/s. Meanwhile, the quasi-static indentation test was carried out using a universal testing machine via an Instron 4505, at crosshead displacement rate of 1 mm/min, with boundary conditions similar to those of the dynamic test. Results obtained showed that the normal impact generated the highest peak force for both the first and second peaks, which are associated with the damage to the top and bottom skins of the sandwich structures. Moreover, regardless of whether the test was done on the normal or inclined angles, it was observed that the dynamic loading produced higher force magnitude in comparison to those of the quasi-static response, due to the enhanced strength and stiffness of the components because of the strain rate and inertia effects. However, in terms of the damage profiles, it is evident that the maximum damage area increased with the increase inclination angle as supported by simple geometric analysis. For the oblique impact cases, the damage was due to the combined effect of tensile, compression, and shear for impact at 10°. The damage occurred as a result of pure shearing for the 20° impact case. In conclusion, the perforation behaviour at inclined angles allowed more area to be perforated in comparison to those of the normal cases.

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“…Modal expansion was used by Lie (1989) and Tsang (1989), Tsang and Dugundji (1992). A three-dimensional analysis of an axisymmetric plate problem was performed by Nemes and Simmonds (1992), while Sun and Wu (1991) and Lee, Huang and Fann (1993) used plate elements to analyze two-dimensional beam problems.…”

Section: Impact and Indentation Of Sandwich Panelsmentioning

confidence: 99%

Simplified theory for contact indentation of sandwich panels

Olsson¹,

Manus²

1995

36th Structures, Structural Dynamics and Materials Conference

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Previous attempts to analyze indentation of sandwich panels have been based on small deflection theory and an assumed elastic core behaviour. The agreement with experiments was poor. The present work includes core crushing and large deflections of the face sheets in a simplified model of sandwich contact indentation. The model assumes transverse isotropy with respect to the load axis and is based on an infinite, elastic face sheet on a core bonded to a rigid foundation. The core is assumed to be elastic in tension and elastic-ideally plastic in compression. After initiation of core yielding the problem is separated in two regions. In the inner, plastic region, the core has yielded and exert a constant reactive pressure on the face sheet. In the outer region the core acts as an elastic foundation. The plastic radius is found by matching boundary conditions for the two regions.The outer region is modeled as a plate on an elastic foundation. The inner region is modeled using three different approaches. For small deflections classical plate theory with shear corrections is used. For intermediate deflections an upper limit of the contact force is given by first order large deflection plate theory and a lower limit by small deflection plate theory. The asymptotic behaviour at large deflections is given by an approximate solution based on membrane theory. The three solutions, which all require iteration, have been put in dimensionless form and tabulated. The approach due to Hertzian contact has been included in the plate solution. Bounds have been given for the residual indentation after unloading. Approximate expressions are given for analysis of orthotropic face sheets.Good agreement with experiments was found for sandwich panels of different materials and thickness. The often observed, approximately linear, load-indentation relation is found to be the combined effect of softening due to core crushing and stiffening due to face sheet membrane effects. A limited parametric study indicates a strong influence of the core yield stress and the face sheet properties, and a relatively weak influence of the thickness and elastic properties of the core. The local indentation model may be used in a global impact model to predict impact response of sandwich panels, or as a starting point for more detailed stress analyses for prediction of damage due to impact and contact loads.

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Dynamic Responses of Composite Sandwich Plate Impacted by a Rigid Ball*

Cited by 56 publications

References 13 publications

Higher-order impact modeling of sandwich structures with flexible core

Higher-order impact modeling of sandwich structures with flexible core

Perforation behaviour of composites sandwich structures on low-velocity impact at oblique angles

Simplified theory for contact indentation of sandwich panels

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