Damage-tolerant CFRP-Foam Core Sandwich Structures

Lang, Uwe; John, Marianne; Schlimper, Ralf; Schäuble, Ralf

doi:10.1007/s35725-016-0071-3

Cited by 1 publication

(2 citation statements)

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“…Here, δ m is the equivalent displacement determined by Equation (15), including normal and tangential displacement. δ 0 m represents the equivalent displacement at the beginning of interface damage.…”

Section: Damage Model Of a Cohesive Unitmentioning

confidence: 99%

“…Both the delamination damage between layers and the damage between fibers and substrates were related to the direction of the material. Lang [ 15 ] concluded that the interface adhesive layer of the panel/core was a weak link of the sandwich structure, which was easy to fail under impact load. This reduced the overall strength and stiffness of the sandwich structure.…”

Section: Introductionmentioning

confidence: 99%

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Performance and Damage Study of Composite Rotor Blades under Impact

Yu,

Li,

Huang

2024

Polymers

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A military helicopter is easily attacked by bullets in a battlefield environment. The composite blade is the main lifting surface and control surface of the helicopter. Its ballistic performance directly determines the vulnerability and survivability of the helicopter in the battlefield environment. To study the ballistic performance of the composite helicopter blade, the damage characteristics of the impacted composite rotor blade are obtained by experiments. A numerical simulation model is established by applying Abaqus software to predict the blade ballistic damage. The three-dimensional progressive damage failure model is used to analyze the ballistic damage under the experimental conditions. The effectiveness and accuracy of the numerical simulation model are verified through a comparison with the experimental results. The ballistic damage of composite blades under three experimental conditions was investigated. The results show that the ballistic damage type of composite blade mainly includes delamination, fiber breakage, and foam collapse. The damage to the composite material at the position of bullet incidence is mainly local shear fracture, while the damage to the composite material at the exit position is mainly fiber tensile fracture. The ballistic damage size of the composite blade is closely related to the ballistic position, incident angle, and structure characteristics along the ballistic path. The larger the incident angle, the smaller the ballistic damage size of the blade. The greater the structural stiffness of the structure near the exit, the greater the damage size of the exit. The numerical simulation model presented in this paper can provide a reference for research on the ballistic performance of composite helicopter blades.

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Section: Damage Model Of a Cohesive Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%