Engineering Method for Prediction of Impact Response and Damage in Sandwich Panels

Olsson, Robin

doi:10.1177/1099636202004001192

Cited by 91 publications

(116 citation statements)

References 26 publications

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“…Impact damage has been characterized by destructive and nondestructive techniques and assessed by measuring the compressive residual strength after impact (CAI) [10,12,[15][16][17][18][19]. Various analytical and numerical models of the impact problem have been and continue to be proposed [20][21][22][23][24][25][26]. Some of these models are spring-mass models describing the dynamics of the structure; other models aim at predicting the actual damage induced on the sandwich structure.…”

Section: Introductionmentioning

confidence: 99%

Response and Damage Tolerance of Composite Sandwich Structures under Low Velocity Impact

et al. 2011

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The deformation and failure response of composite sandwich beams and panels under low velocity impact was reviewed and discussed. Sandwich facesheet materials discussed are unidirectional and woven carbon/ epoxy, and woven glass/vinylester composite laminates; sandwich core materials investigated include four types of closed cell PVC foams of various densities, and balsa wood. Sandwich beams were tested in an instrumented drop tower system under various energy levels, where load and strain histories and failure modes were recorded for the various types of beams. Peak loads predicted by springmass and energy balance models were in satisfactory agreement with experimental measurements. Failure patterns depend strongly on the impact energy levels and core properties. Failure modes observed include core indentation/ cracking, facesheet buckling, delamination within the facesheet, and debonding between the facesheet and core. In the case of sandwich panels, it was shown that static and impact loads of the same magnitude produce very similar far-field deformations. The induced damage is localized and is lower for impact loading than for an equivalent static loading. The load history, predicted by a model based on the sinusoidal shape of the impact load pulse, was in agreement with experimental results. A finite element model was implemented to capture the full response of the panel indentation. The investigation of post impact behavior of sandwich structures shows that, although impact damage may not be readily visible, its effects on the residual mechanical properties of the structure can be quite detrimental.

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Section: Introductionmentioning

confidence: 99%

Response and Damage Tolerance of Composite Sandwich Structures under Low Velocity Impact

et al. 2011

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“…Figure 15 shows the predicted and experimentally recorded foam core crushing loads based on the computed stresses or strains and the material strengths or failure strains as a function of temperature. Because no major interaction between the global and local bending response of the investigated foam cored sandwich beam was detected, the critical core crushing failure load can easily be estimated analytically by equation (12). Referring to Figure 15, the experimentally determined core crushing failure load is defined as the load where the maximum trough-thickness normal strain in the core equals the strain to failure as a function of temperature.…”

Section: Finite Element Modelling (Fem)mentioning

confidence: 99%

“…The two approaches are compared with the conclusion that local shear stresses can be neglected for indentation wave lengths λ higher than 50 to 60 mm, which is the case for most main stream composite sandwich panels. Olsson [12] presented an indentation model very similar to Thomsen's Winkler model but additionally proposed two different foundation moduli for thick cores to calculate local deflections and stresses respectively. Both authors highlighted the dependency of the foundation modulus K z on the thickness of the core and proposed different formulations for thin and thick cores.…”

Section: Introductionmentioning

confidence: 99%

Indentation failure of foam cored sandwich structures subjected to elevated temperatures

Laux

Thomsen

2017

Jnl of Sandwich Structures & Materials

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This research explores the detrimental effect of elevated temperatures on local indentation failure of polymer foam cored sandwich structures with laminated glass fibre reinforced epoxy face sheets. A simple analytical model to predict the critical indentation failure load at elevated temperatures is presented and validated against experimental observations. For this purpose, a sandwich beam loaded in three-point bending with an induced through-thickness elevated temperature profile was studied experimentally and by means of analytical and finite element models. In the experiment, the through-thickness temperature gradient was induced with an infrared lamp pointing on the top face sheet, while the local displacement and strain fields near the applied point load were recorded by digital image correlation. The analytical model proposed, which accounts for temperature degraded/reduced foam core properties, superimposes the local response, approximated by the classical Winkler foundation model, and the global response obtained by sandwich beam theory. The comparative study has shown that the critical load causing core crushing failure reduces significantly with elevated temperatures by as much as 50% at an elevated temperature of 90℃. It is shown that the simple analytical model can predict the local deflections and core stresses of foam cored composite sandwich structures subjected to simultaneous localized mechanical loading and elevated temperatures. Thus, the analytical model can be used as a preliminary design tool to determine the critical core crushing load at elevated temperatures.

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“…To predict the impact response and the amount of impact damage, several simulation methodologies have been developed, [5]- [14]. Some of them are based on a simple analytical approach, which predicts damage initiation but does not describe damage progression, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Some of them are based on a simple analytical approach, which predicts damage initiation but does not describe damage progression, e.g. [5]- [8]. Furthermore, analytical models are restricted to special plate boundaries.…”

Section: Introductionmentioning

confidence: 99%

FE-Tool CODAC for an Efficient Simulation of Low-Velocity Impacts on Composite Sandwich Structures

Kärger¹,

Baaran²,

Teßmer³

III European Conference on Computational Mechanics

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Engineering Method for Prediction of Impact Response and Damage in Sandwich Panels

Cited by 91 publications

References 26 publications

Response and Damage Tolerance of Composite Sandwich Structures under Low Velocity Impact

Response and Damage Tolerance of Composite Sandwich Structures under Low Velocity Impact

Indentation failure of foam cored sandwich structures subjected to elevated temperatures

FE-Tool CODAC for an Efficient Simulation of Low-Velocity Impacts on Composite Sandwich Structures

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