scholarly journals Numerical Buckling Analysis of Hybrid Honeycomb Cores for Advanced Helmholtz Resonator Liners

2021 ◽  
Vol 5 (5) ◽  
pp. 116
Author(s):  
Moritz Neubauer ◽  
Martin Dannemann ◽  
Michael Kucher ◽  
Niklas Bleil ◽  
Tino Wollmann ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Hybrid Cell ◽  
Local Buckling ◽  
Buckling Analysis ◽  
Failure Behavior ◽  
Fiber Reinforced ◽  
Honeycomb Core ◽  
Element Analysis ◽  
Nonlinear Buckling ◽  
Starting Point

In order to realize novel acoustic liners, honeycomb core structures specially adapted to these applications are required. For this purpose, various design concepts were developed to create a hybrid cell core by combining flexible wall areas based on thermoplastic elastomer films and rigid honeycomb areas made of fiber-reinforced thermoplastics. Within the scope of the presented study, a numerical approach was introduced to analyze the global compressive failure of the hybrid composite core structure, considering local buckling and composite failure according to Puck and Cuntze. Therefore, different geometrical configurations of fiber-reinforced tapes were compared with respect to their deformation as well as their resulting failure behavior by means of a finite element analysis. The resulting compression strength obtained by a linear buckling analysis agrees largely with calculated strengths of the more elaborate application of the failure criteria according to Puck and Cuntze, which were implemented in the framework of a nonlinear buckling analysis. The findings of this study serve as a starting point for the realization of the manufacturing concept, for the design of experimental tests of hybrid composite honeycomb core structures, and for further numerical investigations considering manufacturing as well as material specific aspects.

Buckling Analysis of Wind Power Tower Considering the Effect of Nonlinearity

2012 ◽  
Vol 256-259 ◽  
pp. 792-795
Author(s):  
Bo Song ◽  
Shuai Huang ◽  
Wen Shan He ◽  
Wei Wei
Keyword(s):  
Wind Power ◽  
Geometric Nonlinearity ◽  
Local Buckling ◽  
Element Model ◽  
Buckling Analysis ◽  
Buckling Load ◽  
Nonlinear Buckling ◽  
Buckling Behavior ◽  
Geometry Nonlinearity ◽  
Material And Geometric Nonlinearity

Based on the 3D finite element model of the wind power tower, buckling behavior of the wind power tower in different wind directions is analyzed, and the effect considering geometry nonlinearity and considering the material and geometry nonlinearity to the buckling analysis is studied. The results show when the ratio of the radius of the tower drum and the length of the element is 18.75, the calculated precision can reach 95%. Local buckling of the wind power tower first appears, and buckling load and displacement considering the material and geometric nonlinearity reduce 52% and 58% compared with that only considering geometry nonlinearity. The linear and nonlinear buckling load of the wind power tower which is 90° sidewind are 1.8 and 1.2 times than those facing the wind direction.

Tripping Analysis and Design Consideration of Permanent Means of Access Structure

2011 ◽  
Author(s):  
Ming Ma ◽  
Beom-Seon Jang ◽  
Owen F. Hughes
Keyword(s):  
Finite Element ◽  
Design Space Exploration ◽  
Solution Process ◽  
Local Buckling ◽  
Extensive Study ◽  
Buckling Analysis ◽  
Element Analysis ◽  
Analysis And Design ◽  
Linear Buckling ◽  
Linear Buckling Analysis

An efficient Rayleigh-Ritz approach is presented for analyzing the lateral-torsional buckling (“tripping”) behavior of permanent means of access (PMA) structures. Tripping failure is dangerous and often occurs when a stiffener has a tall web plate. For ordinary stiffeners of short web plates, tripping usually occurs after plate local buckling and often happens in plastic range. Since PMA structures have a wide platform for a regular walk-through inspection, they are vulnerable to elastic tripping failure and may take place prior to plate local buckling. Based on an extensive study of finite element linear buckling analysis, a strain distribution is assumed for PMA platforms. The total potential energy functional, with a parametric expression of different supporting members (flat bar, T-stiffener and angle stiffener), is formulated, and the critical tripping stress is obtained using eigenvalue approach. The method offers advantages over commonly used finite element analysis because it is mesh-free and requires only five degrees of freedom; therefore the solution process is rapid and suitable for design space exploration. The numerical results are in agreement with NX NASTRAN [1] linear buckling analysis. Design recommendations are proposed based on extensive parametric studies.

Finite Element Analysis on Drilling of Unidirectional Carbon Fiber Reinforced Plastic (CFRP)

2013 ◽  
Vol 455 ◽  
pp. 228-231 ◽  
Author(s):  
Yan Li He ◽  
Guo Peng Zhang ◽  
Jun Peng Xue
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Thrust Force ◽  
Three Dimensional ◽  
Failure Behavior ◽  
Drilling Process ◽  
Fe Model ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Carbon Fiber Reinforced

Various kinds of damage may occur during the drilling of carbon fiber reinforced polymer composite (CFRP). To review the mechanism of CFRP drilling, a three-dimensional macro-mechanical finite element (FE) model was constructed for CFRP drilling based on FE software tool Abaqus. The workpiece was modeled as equivalent homogenous anisotropic material (EHAM) with elastic-failure behavior. Three-dimensional Hashin criterion was used to predict the material failure. The material was implemented in user subroutine VUMAT. The drilling process was analyzed and the thrust force with respect to cutting conditions was evaluated. The simulation shows that thrust force increase with feed rates while decrease with spindle speed, as agrees with experiment.

Finite Element Analysis on the Failure Behavior of Straight Pipe With Wall Thinning

2004 ◽  
Author(s):  
Ken Inoue ◽  
Koji Takahashi ◽  
Kotoji Ando ◽  
Seok Hwan Ahn ◽  
Ki Woo Nam ◽  
...  
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Local Buckling ◽  
Metal Loss ◽  
Failure Behavior ◽  
Straight Pipe ◽  
Element Analysis ◽  
Deformation And Failure ◽  
Wall Thinning ◽  
Local Wall Thinning

Monotonic four-point bending tests were conducted using straight pipe specimens 102 mm in diameter with local wall thinning in order to investigate the effects of the depth, shape, and location of wall thinning on the deformation and failure behavior of pipes. The local wall thinning simulated erosion/corrosion metal loss. The deformation and fracture behavior of the straight pipes with local wall thinning was compared with that of non wall-thinning pipes. The failure modes were classified as local buckling, ovalization, or crack initiation depending on the depth, shape, and location of the local wall thinning. Three-dimensional elasto-plastic analyses were carried out using the finite element method. The deformation and failure behavior, simulated by finite element analyses, coincided with the experimental results.

Large Span Double Truss Lateral Stability Analysis

2014 ◽  
Vol 680 ◽  
pp. 171-174
Author(s):  
Yu Zhuo Jia ◽  
Yi Xuan Wang
Keyword(s):  
Orthogonal Design ◽  
Research Process ◽  
Stability Study ◽  
Buckling Analysis ◽  
Reference Plane ◽  
Displacement Curve ◽  
Element Analysis ◽  
Nonlinear Buckling ◽  
Large Span ◽  
Space Truss

The effects of large-span truss geometry of the double-plane stable orthogonal design. The use of finite element analysis software Midas double space truss were linear buckling analysis and nonlinear buckling analysis, research process and through its buckling load - examine issues outside of the structure of the plane stable displacement curve. For double truss draw some outside reference plane stability study conclusions.

scholarly journals Finite Element Analysis of Buckling of Corrugated Fiberboard

2014 ◽  
Vol 8 (1) ◽  
pp. 257-263 ◽  
Author(s):  
Yali Ma ◽  
Zhen Gong ◽  
Liang Zhao ◽  
Yue Han ◽  
Yun Wang
Keyword(s):  
Finite Element ◽  
Parametric Design ◽  
Buckling Analysis ◽  
Ideal Condition ◽  
Element Analysis ◽  
Nonlinear Buckling ◽  
Nonlinear Buckling Analysis ◽  
The Relationship ◽  
D Model ◽  
Corrugated Fiberboard

This paper investigates the relationship between mechanical behaviors and the shape of corrugated fiberboard by means of buckling analysis, which is done by FEM (Finite Element Method). Firstly, after analyzing the structure of corrugated fiberboard, a single-wall corrugated fiberboard model was built. The buckling load was measured in the ideal condition by linear buckling analysis (eigenvalue buckling analysis). Subsequently, nonlinear buckling analysis based on single-wall corrugated fiberboard was performed using the results of the eigenvalue buckling analysis. Finally, a finite element 3-D model of four-layer and five-layer corrugated fiberboard was established using ANSYS parametric design language (APDL) to improve mechanical properties of corrugated fiberboard based on comparing different eigenvalue buckling loads.

Local Buckling Analysis for Large Diameter Underground Jacked Steel Tubes under External Load

2010 ◽  
Vol 452-453 ◽  
pp. 501-504
Author(s):  
Chun Fu Jin ◽  
Shi Yan ◽  
Peng Niu
Keyword(s):  
Failure Modes ◽  
Large Diameter ◽  
Local Buckling ◽  
Steel Tube ◽  
Buckling Analysis ◽  
Underground Structures ◽  
Nonlinear Buckling ◽  
Practical Engineering ◽  
The Stability ◽  
Nonlinear Buckling Analysis

Densely arranged underground steel tube system (DAUSTS) is a new kind of structure which can be usually used in constructing spacious underground structures such as metro stations. During the construction, the steel tube is horizontally forced into soil by jacks through a vertical well. The tube may generate local buckling phenomena under the compression force if the parameter of the tube and soil meet the buckling condition. In the paper, the soil perturbation mode and the deformation of the tube before local buckling are both analyzed, considering the possibly concerned buckling failure modes in practical engineering, the confine effect of the soil and interaction between the tubes. A nonlinear buckling analysis on tube-wall of the steel tube located in the most unfavorable place is developed by the arc-length method of the finite element method (FEM), considering the effect of the large deformation. The results of the numerical simulation matches very well to the real application and the key results of the analysis can be used as an estimation principle for the stability of the tube.

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