Elastic bending behavior of solid orthogonal woven 3-D carbon–carbon composite beams

2008 ◽  
Vol 68 (3-4) ◽  
pp. 666-672 ◽  
Author(s):  
Chen-Ming Kuo
Keyword(s):  
Carbon Composite ◽  
Composite Beams ◽  
Elastic Bending ◽  
Bending Behavior

Negative bending behavior of novel U-shaped steel and concrete composite beams

2021 ◽  
Vol 237 ◽  
pp. 112217
Author(s):  
Yi Zhao ◽  
Xuhong Zhou ◽  
Yuanlong Yang ◽  
Jiepeng Liu ◽  
Yohchia Frank Chen
Keyword(s):  
Composite Beams ◽  
Bending Behavior ◽  
Negative Bending

Evaluation of mechanical and vibration behavior of hybrid epoxy carbon composite beam carrying micron-sized CTBN rubber and nanosilica particles

2018 ◽  
Vol 233 (9) ◽  
pp. 1738-1752
Author(s):  
C Senthamaraikannan ◽  
R Ramesh
Keyword(s):  
Free Vibration ◽  
Frequency Response ◽  
Response Function ◽  
Epoxy Matrix ◽  
Composite Beam ◽  
Frequency Response Function ◽  
Secondary Reinforcement ◽  
Carbon Composite ◽  
Composite Beams ◽  
Rubber Particles

The suppression of vibration in dynamic structures is considered as one of the important functional requirements. In the present investigation, the free vibration behaviour of the woven carbon-epoxy composite beams was studied by blending nanosilica and micro-sized carboxyl-terminated butadiene acrilonitrile copolymer CTBN rubber in an epoxy matrix. The basic I and channel shapes widely used in structural applications were considered for fabrication of composite beams and made by hand layup method. The hybrid specimens were prepared by keeping 9% rubber particles by weight as stable primary ingredients in epoxy and the secondary reinforcement nanosilica was added by varying the weight fraction of 6% and 11%. The mechanical behaviour study and free vibration test were conducted as per ASTM standards and compared between virgin and hybrid composites. The addition of nanosilica, as secondary reinforcement in an epoxy matrix improves the mechanical properties of CTBN rubber-blended carbon composites. The structural beams were tested by impulse frequency response method under cantilever boundary conditions. Frequency response function plots were recorded and compared for all considered beam samples. The decreased amplitude response observed in frequency response function plot for micro rubber added samples of 9 wt%, indicate enhanced passive damping characteristics. The nanosilica, along with the micro rubber particles, shows improved passive damping capacity than virgin carbon composite beam. Finite element modelling of the composite beam was done for modal response using ANSYS® application software. Mode shapes and corresponding modal frequency of all types of beams have been compared and discussed.

Nonclassical Behavior of Thin‐Walled Composite Beams with Closed Cross Sections

1990 ◽  
Vol 35 (2) ◽  
pp. 42-50 ◽  
Author(s):  
Lawrence W. Rehfield ◽  
Ali R. Atilgan ◽  
Dewey H. Hodges
Keyword(s):  
Cross Sections ◽  
Transverse Shear ◽  
Composite Beams ◽  
Cross Sectional ◽  
Elastic Bending ◽  
Composite Blade ◽  
Beam Displacement ◽  
Thin Walled ◽  
Cantilevered Beams ◽  
Shear Coupling

This paper focuses on two nonclassical effects in the behavior of thin‐walled composite beams: elastic bending‐shear coupling and restrained torsional warping. These nonclassical effects are clarified and analyzed in some simple examples involving cantilevered beams. First, elastic bending‐transverse shear coupling is shown to be important in the analysis of beams designed for extension‐twist coupling. It is found that the lateral deflections ran be off by more than a factor of two if this coupling is ignored. This coupling stems from plies with off‐axis fibers in the beam. The presence of these plies affects significantly the modeling approach (i.e., determination of the constitutive equations) in that transverse shear must appear in the kinematics so that its coupling with bending will he exhibited in the elastic constants. This finding is in accord with “exact” beam theories which develop the beam displacement and cross sectional orientation in terms of six kinematical variables instead of the three or four found in some previously published works on composite blade modeling. A second nonclassical effect, torsional warping rigidity, is shown to be important far certain box beams having a thin‐walled, closed cross section. The importance of including these nonclassical phenomena in a complete theory is discussed in light of the magnitude of their effects for various values of configuration parameters.

scholarly journals Predictive Models for Elastic Bending Behavior of a Wood Composite Sandwich Panel

Forests ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 624 ◽  
Author(s):  
Mostafa Mohammadabadi ◽  
James Jarvis ◽  
Vikram Yadama ◽  
William Cofer
Keyword(s):  
Material Properties ◽  
Sandwich Panel ◽  
Theoretical Models ◽  
Bending Stiffness ◽  
Building Envelope ◽  
Fe Model ◽  
Wood Composite ◽  
Elastic Bending ◽  
Composite Sandwich ◽  
Bending Behavior

Strands produced from small-diameter timbers of lodgepole and ponderosa pine were used to fabricate a composite sandwich structure as a replacement for traditional building envelope materials, such as roofing. It is beneficial to develop models that are verified to predict the behavior of these sandwich structures under typical service loads. When used for building envelopes, these structural panels are subjected to bending due to wind, snow, live, and dead loads during their service life. The objective of this study was to develop a theoretical and a finite element (FE) model to evaluate the elastic bending behavior of the wood-strand composite sandwich panel with a biaxial corrugated core. The effect of shear deformation was shown to be negligible by applying two theoretical models, the Euler–Bernoulli and Timoshenko beam theories. Tensile tests were conducted to obtain the material properties as inputs into the models. Predicted bending stiffness of the sandwich panels using Euler-Bernoulli, Timoshenko, and FE models differed from the experimental results by 3.6%, 5.2%, and 6.5%, respectively. Using FE and theoretical models, a sensitivity analysis was conducted to explore the effect of change in bending stiffness due to intrinsic variation in material properties of the wood composite material.

scholarly journals Protocol for mapping the spatial variability in cell wall mechanical bending behavior in living leaf pavement cells

2021 ◽  
Author(s):  
Wenlong Li ◽  
Sedighe Keynia ◽  
Samuel A. Belteton ◽  
Faezeh Afshar-Hatam ◽  
Daniel B. Szymanski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Elastic Modulus ◽  
Cell Walls ◽  
Turgor Pressure ◽  
Plant Cell Walls ◽  
Pavement Cells ◽  
Elastic Bending ◽  
Entire Thickness ◽  
Bending Behavior

AbstractAn integrated, experimental-computational approach is presented to analyze the variation of elastic bending behavior in the primary cell wall of living Arabidopsis thaliana pavement cells and to measure turgor pressure in the cells quantitatively under different osmotic conditions. Mechanical properties, size and geometry of cells and internal turgor pressure greatly influence their morphogenesis. Computational models of plant morphogenesis require values for wall elastic modulus and turgor pressure but very few experiments were designed to validate the results using measurements that deform the entire thickness of the cell wall. Because new wall material is deposited from inside the cell, full-thickness deformations are needed to quantify relevant changes associated with cell development. The approach here uses laser scanning confocal microscopy to measure the three-dimensional geometry of a single pavement cell, and indentation experiments equipped with high magnification objective lens to probe the local mechanical responses across the same cell wall. These experimental results are matched iteratively using a finite element model of the experiment to determine the local mechanical properties, turgor pressure, and cell height. The resulting modulus distribution along the periclinal wall is shown to be nonuniform. These results are consistent with the characteristics of plant cell walls which have a heterogeneous organization. This research and the resulting model will provide a reference for future work associated with the heterogeneity and anisotropy of mechanical properties of plant cell walls in order to understand morphogenesis of the primary cell walls during growth and to predict quantitatively the magnitudes/directions of cell wall forces.One sentence summaryThe distribution of elastic modulus of the periclinal cell walls of livingArabidopsis epidermis is nonuniform as measured by bending the entire thickness of the wall.HighlightsExperimental characterization of the spatial distribution of elastic bending behavior across the periclinal wallQuantification of the turgor pressure of the living plant epidermal cells validated with osmotic treatmentsQuantification of the effect of cell geometry on the measured mechanical responseGraphical abstract

scholarly journals Elastic Bending Behavior of Aluminum Alloy Foam

2011 ◽  
Vol 10 ◽  
pp. 2994-2999 ◽  
Author(s):  
F. Triawan ◽  
K. Kishimoto ◽  
T. Adachi ◽  
K. Inaba ◽  
T. Nakamura ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Elastic Bending ◽  
Bending Behavior
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