Dynamic testing and modelling of composite fuselage frames and fasteners for aircraft crash simulations

Heimbs, Sebastian; Hoffmann, Marco; Waimer, Matthias; Schmeer, Sebastian; Blaurock, Jörg

doi:10.1080/13588265.2013.801294

Cited by 37 publications

(17 citation statements)

References 34 publications

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“…As damage tends to localise at stress concentrations, joints have a significant influence on the level of energy absorbed in a crash situation. In fact, in a global aircraft crash simulation, if the failure of fastened joints is not modelled accurately, global kinematics and the predicted overall crash behaviour can be completely incorrect [8]. Thus, accurate simulation of catastrophic failure of dynamically loaded countersunk composite joints is an important research goal for the aircraft industry.…”

Section: Introductionmentioning

confidence: 97%

Finite element analysis of catastrophic failure of dynamically-loaded countersunk composite fuselage joints

Egan

McCarthy

Frizzell³

et al. 2015

Composite Structures

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Section: Introductionmentioning

confidence: 97%

Finite element analysis of catastrophic failure of dynamically-loaded countersunk composite fuselage joints

Egan

McCarthy

Frizzell³

et al. 2015

Composite Structures

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“…Composite materials have been applied to design the main load bearing and energy absorption structures in automobile, aerospace and shipbuilding industries for light-weight and excellent crashworthiness performance [12,19]. During the service life, the structures would undergo complex loading conditions, e.g., dynamic load, multi-axial load [7,15]. For the effective use of composite materials in safety structures, it is essential to fully understand the mechanical behaviour of composite materials under both quasi-static and high strain rate loadings.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of in-plane mechanical performance of carbon/glass hybrid woven composite at different strain rates

Zhu

et al. 2016

International Journal of Crashworthiness

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Woven composite has been increasingly employed in engineering applications undergoing complex loading conditions. For effective use of composite materials, it is essential to fully understand the mechanical behaviour of composite at different strain rates. In the present study, both in-plane tensile and compressive mechanical properties of a carbon/glass hybrid plain weave composite were experimentally investigated over the strain rate range from 0.001 to 1000 s ¡1 . High strain rate tests were carried out using Split Hopkinson Pressure and Split Tensile Bar apparatuses, respectively. Experiments were performed at the axial direction of 0 and 90 , and the off-axial direction of 45 considering the tension/compression asymmetry and anisotropy characteristic. The results indicated that the in-plane mechanical performance was strain rate sensitive under both tensile and compressive loadings. Highly direction-dependent and tension/compression asymmetric characteristic was observed under quasi-static and high strain rate loadings. The elastic modulus showed no strain rate sensitivity for the 0 axial tension. However, for other loading conditions, the elastic modulus was enhanced by 1.7À7.2 times under high strain rate loading. The strength was increased by 1.2À2.5 times at 1000 s ¡1 compared with that under quasi-static loading for different loading directions. For higher strain rate sensitivity under compression than tension, the asymmetry was less obvious with the increase of strain rate. Two phenomenological models were proposed to quantitatively fit the relationship between the strength property and strain rate, which showed great consistency between the experimental and fitted results.

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“…With the aim to bridge the aforementioned gaps and provide a further insight into the actual mechanical response of composite pull-out joints, the work herein presents the test of a typical aerospace material system and fastener combination (carbon/epoxy AS4/8552 and titanium countersunk lockbolts) subjected to a velocity range, i.e. from quasi-static to 2.1 m/s, representative of several aircraft loading conditions, such as hard landing and ditching events [22,23]. To achieve the dynamic tests, a novel test fixture [24] and a standard drop tower test machine is used.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Fastener Pull-out Response in Composite Joints under Static and Dynamic Loading Rates

2019

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A novel device is adopted in order to experimentally investigate the effect of various loading rates on the pull-out response of a fastened composite joint configuration. The joint coupons comprise a composite plate made of the carbon/epoxy AS4/8552 material system and a centrally located titanium lockbolt. Tensile-type (pull) loading was applied to the specimens in a velocity range from quasi-static to 2.1 m/s. Both quasi-static and dynamic tests were conducted using the same specimen geometry and boundary conditions, which conform to international and industrial standards. The experim ental work expands the limited literature and understanding of the mechanical response of composite pull-out joints under the action of dynamic loading. The main experimental observations revealed an increase of 15% regarding maximum load values when loading rate shifts from the static to the impact regime, while the failure patterns derived from static and dynamic tests were similar, although the latter presented a more intense damage zone.

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Dynamic testing and modelling of composite fuselage frames and fasteners for aircraft crash simulations

Cited by 37 publications

References 34 publications

Finite element analysis of catastrophic failure of dynamically-loaded countersunk composite fuselage joints

Finite element analysis of catastrophic failure of dynamically-loaded countersunk composite fuselage joints

Experimental study of in-plane mechanical performance of carbon/glass hybrid woven composite at different strain rates

Experimental Investigation of Fastener Pull-out Response in Composite Joints under Static and Dynamic Loading Rates

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