Primary and combined multi-frequency parametric resonances of a rotating thin-walled composite beam under harmonic base excitation

There are unavoidable deviations, such as shrinkage and distortions, in the composite detail parts production due to the complexity of composites fabrication. Interests in the assembly analysis of composite beams have led to a need for more accurate analysis especially in the case of fabrication deviations. This work proposes a numerical finite element model of thin-walled C-section composite beam with R-angle deviation for assembling. The rule of Hashin failure combined with cohesive element is applied to study the mechanical performance of the fiber and matrix (implemented as user subroutine UMAT in ABAQUS) while positioning and clamping. Tension and compression tests are carried out based on available standards to determine the C-section beam behavior under load. The testing data validates the proposed numerical model. The numerical model captures the experimentally obtained results with minimal error, and predicts the failure modes successfully. The proposed model allows to determine accurately the first failure location and the associated load level. It will enhance the understanding of the composite components pre-loading analysis, and help systematically improving the composites assembling efficiency in civil aircraft industry.

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Tolerance Simulation of Thin-Walled C-Section Composite Beam in Wingbox Assembly Under Preloading

Volume 2B: Advanced Manufacturing ◽

10.1115/imece2015-50273 ◽

2015 ◽

Cited By ~ 1

Author(s):

Hua Wang ◽

Jun Liu

Keyword(s):

Probability Distribution ◽

Composite Beam ◽

Composite Structures ◽

Simulation Method ◽

Simulation Software ◽

Fea Model ◽

Final Assembly ◽

Thin Walled ◽

Thickness Variations ◽

Induced Changes

Tolerance simulation’s reliability depends on the concordance between the input probability distribution and the practical situation. Pre-loading induced changes in the probability distribution should be considered in the structure’s tolerance simulation, especially for composite structures. The paper presents a tolerance simulation method for the thin-walled C-section composite beam (TC2B) assembling under preloading, that is prescribed clamping force. Based on FEA model of TC2B, the preloading-modified probability distribution function of the R angle spring-in deviation is proposed. Thickness variations of the TC2B are obtained from the data of the downscaled composite wingbox. These parts’ variations are input to the tolerance simulation software, and the final assembly variations are obtained. The assembly of the downscaled wingbox illustrates the effect of preloading on the probability distribution of the R angle spring-in deviation. The results have shown that tolerance simulation with the modified probability distribution is more accurate than the initial normal distribution. The tolerance simulation work presented in the paper will enhance the understanding of the composite parts assembling with spring-in deviations, and help systematically improving the precision control efficiency in civil aircraft industry.

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Study on Dynamic Response Characteristics of Composite Thin-Walled Square Beam Subject to Three-Point Bending

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.201-202.715 ◽

2012 ◽

Vol 201-202 ◽

pp. 715-720

Author(s):

Gang Yi Zhou ◽

Xin Long Dong ◽

Jun Liu

Keyword(s):

Composite Beam ◽

Simulation Analysis ◽

Impact Load ◽

Single Beam ◽

Three Point Bending ◽

Response Characteristics ◽

Crushing Force ◽

Good Energy ◽

Thin Walled ◽

Good Agreement

In this paper, the experiment of thin-walled square beam subject to three-point bending by using the self-devised drop-hammer impact was carried out. The mechanical behavior of this thin-walled specimen under impact load was obtained. The process of deformation and the dynamic buckling behaviors of composite square beam were analyzed by mean of simulation technique of finite element using ANSYS/LS-DYNA. The simulation analysis of deformation and crushing force characteristics was in good agreement with the experimental results. Meanwhile, the comparative analysis of percussive force and energy absorbability from composite beam and single beam was performed. It is shown by the investigation that the peak percussive force of such composite beam falls down relative to single beam and it possesses good energy absorbability too. The computed result also shows reducing the thickness of the bottom board of such thin-walled square beam has less of an effect on the energy absorbability.

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