Composite crash absorber for aircraft fuselage applications

Heimbs, Sebastian; Strobl, Florian; Middendorf, Peter; Guimard, Jean-Mathieu

doi:10.2495/su100011

Cited by 32 publications

(21 citation statements)

References 18 publications

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“…Further absorption mechanisms in the vertical support struts are not considered in this study. However, several known concepts could be used to absorb further energy in the vertical support struts in crash cases of higher kinetic energy [14,21].…”

mentioning

confidence: 99%

Investigation of a crash concept for CFRP transport aircraft based on tension absorption

Schatrow

Waimer

2014

International Journal of Crashworthiness

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Transport aircraft made of carbon fibre reinforced plastics (CFRP) have to provide an equivalent crashworthiness compared to today's aluminium aircraft designs. However, CFRP structures typically show brittle failure behaviour under complex loading conditions and little energy absorption, whereas aluminium structures provide comparably high energy absorption due to their ductile failure characteristics. Improved crashworthiness for CFRP fuselages can be obtained by the installation of special crash devices, which are designed for energy absorption by progressive failure in compression, tension or bending. The realisation of crashworthy CFRP fuselage designs with the focus on compression or bending absorbers is often associated with significant mass penalty compared to the purely static sizing of the corresponding fuselage structure. In this context, an alternative crash kinematics was developed and numerically investigated in which most of the kinetic energy is dissipated by tension absorption in the sub-cargo area of a fuselage structure. The numerical study was performed on the basis of a purely vertical impact with a two-bay fuselage section using the explicit finite element (FE) solver Abaqus/Explicit. The simulation results show for the developed crash kinematics several advantages, e.g. reduced mass penalty, with the tension absorption concept compared to crash concepts that use energy absorption by progressive crushing in the sub-cargo area.

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confidence: 99%

Investigation of a crash concept for CFRP transport aircraft based on tension absorption

Schatrow

Waimer

2014

International Journal of Crashworthiness

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“…A significant portion of the kinetic energy is absorbed by the crushing of composite tubes used in the design of these struts connecting the two floors. In one design, end fittings cut the tube into strips that are then crushed by bending [338,339]. Similarly, composite tubes are used as energy absorbers integrated in the design of helicopter landing gears [340].…”

Section: Aerospace Applicationsmentioning

confidence: 99%

“…Fiber failures can also be modeled by cohesive elements. In a series of articles, Bouvet et al [199,[232][233][234] use cohesive elements to High velocity impact [201,275,372,373] Soft impact [202,[254][255][256] Crushing tube [203,326] Crushing plate [349,350] Energy absorbing structures [338,339,374] predict both intraply and interlaminar damage during low velocity impacts. This approach was also used to study the compression after impact behavior of laminates [235].…”

Section: Low Velocity Impactsmentioning

confidence: 99%

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Cohesive zone models and impact damage predictions for composite structures

2015

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This article surveys existing cohesive zone models (CZM) and their use in numerical simulations for analysis impacts on composite structures and predicting the damage induced. These models are used for matrix cracks and delamination. The first part of article gives the required background on failure criteria for predicting the onset of delaminations, on fracture mechanics and the various types of CZM. The second part discusses applications of CZM to several types of impact problems with composite structures. Applications for these models to other problems are briefly mentioned at the end. CZM are now part of state of the art numerical simulations with progressive damage analysis.

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“…A new articulated connection was given by Heimbs et al, and shear failure behaviour of composite tube was adopted as shown in Fig. 11 (21) . It is a new attempt to get better structure having important significance to the development of crashworthiness design.…”

Section: Preliminary Strut Designmentioning

confidence: 99%

Energy absorption structures design of civil aircraft to improve crashworthiness

Ren¹,

Xiang²

2014

Aeronaut. j. (1968)

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To improve the crashworthiness of civil aircraft, the design concept of energy absorption structure for civil aircraft is investigated. Two typical different design principles could be identified. The first category includes Helicopter and Light fixed-wing Aircraft (HLA), and Transport, Mid-size and Commuter type Aircraft (TMCA) are classified into the second group. Frame, strut and bottom structure are the three kinds of energy absorption structure for TMCA. The strut layout of conventional civil aircraft is studied and some energy absorption devices are adopted. High efficiency energy absorption structures such as the foam and sine-wave beam are employed as the bottom structure for both of HLA and LMCA. The finite element method is used to analyse and design energy absorption structure in aircraft crashworthiness problem. Results show that the crashworthiness of civil aircraft could be largely improved by using proper strut layout and excellent energy absorption device. The stiffness combination of frame and strut should be considered to get better global aircraft deformation. Supporting platform and failure model are the two core problems of bottom energy absorption structure design. Foam and sine-wave beam under the lifted frame could improve the crashworthiness of civil aircraft.

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Composite crash absorber for aircraft fuselage applications

Cited by 32 publications

References 18 publications

Investigation of a crash concept for CFRP transport aircraft based on tension absorption

Investigation of a crash concept for CFRP transport aircraft based on tension absorption

Cohesive zone models and impact damage predictions for composite structures

Energy absorption structures design of civil aircraft to improve crashworthiness

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