Finite element modeling of multiple transverse impact damage behaviors of 3-D braided composite beams at microstructure level

2018 ◽  
Vol 148 ◽  
pp. 730-744 ◽  
Author(s):  
Meiqi Hu ◽  
Junjie Zhang ◽  
Baozhong Sun ◽  
Bohong Gu
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Impact Damage ◽  
Composite Beams ◽  
Transverse Impact ◽  
Braided Composite ◽  
Element Modeling

Multiple transverse impact damage behaviors of 3-D-braided composite beams under room and high temperatures

2019 ◽  
Vol 29 (5) ◽  
pp. 715-747
Author(s):  
Meiqi Hu ◽  
Shengkai Liu ◽  
Junjie Zhang ◽  
Lei Wang ◽  
Baozhong Sun ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Impact Damage ◽  
Three Dimensional ◽  
Composite Beams ◽  
Transverse Impact ◽  
Engineering Structure ◽  
Braided Composite ◽  
Impact Deformation ◽  
Initial Modulus ◽  
The Impact

Three-dimensional braided composite materials have been widely applied to engineering structure manufacturing. It is of a great importance to characterize the impact damage of the three-dimensional braided composite under various temperatures for optimizing the engineering structure. Here we conducted transverse impact deformation and damage of three-dimensional braided composite beams with different braiding angles at room and elevated temperatures. A split Hopkinson pressure bar with a heating device combined with high-speed camera was employed to test multiple transverse impact behaviors and to record the impact deformation developments. The results indicated that failure load, initial modulus, and energy absorption decreased with the increase of temperature, whereas the deformation increased slightly with elevated temperatures. We found that the impact brittle damages occurred earlier and the local adiabatic temperature raised higher when the temperature is lower than the glass transition temperature (Tg) of epoxy resin. While above the Tg, the impact ductile damages occurred later and the local temperature raised lower. The thermal stress distribution along the braiding yarn leads to cracks propagation in yarn direction. Part of the impact energy absorptions converted into thermal energy. In addition, the beam with larger braiding angle has high damage tolerance and crack propagation resistance.

Finite element modeling of the quasi-static axial crushing of braided composite tubes

2013 ◽  
Vol 73 ◽  
pp. 146-153 ◽  
Author(s):  
Ping Zhang ◽  
Liang-Jin Gui ◽  
Zi-Jie Fan ◽  
Qiang Yu ◽  
Zhao-Kai Li
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Composite Tubes ◽  
Braided Composite ◽  
Axial Crushing ◽  
Element Modeling

FINITE ELEMENT MODELING OF STEEL-CONCRETE COMPOSITE BEAMS STRENGTHENED WITH PRESTRESSED CFRP PLATE

2012 ◽  
Vol 12 (01) ◽  
pp. 23-51 ◽  
Author(s):  
R. EL-HACHA ◽  
P. ZANGENEH ◽  
H. Y. OMRAN
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Parametric Study ◽  
Large Scale ◽  
Composite Beams ◽  
Experimental Results ◽  
Fe Model ◽  
Element Modeling ◽  
Cfrp Plate ◽  
Good Agreement

Results from finite element modeling (FEM) of large-scale steel-concrete composite beams strengthened in flexure with prestressed carbon fiber-reinforced polymer (CFRP) plate were validated with experimental results and presented in this paper. The effect of varying the level of prestressing as percentage of the ultimate tensile strength of the CFRP plate was investigated. Comparison was carried out in terms of overall load-deflection behavior, strain profile along the length of the CFRP plate, and strain distribution across the depth of the beam at mid-span section. Very good agreement was observed between the finite element (FE) and the experimental results. The validated FE models were used to perform a comprehensive parametric study to investigate the changes in the behavior through wider range of prestressing levels and then, determine the optimum prestressing level that maintain the unstrengthened beams' original ductility (or energy absorption). An iterative analytical model was also developed, validated with both the FE model and the experimental results, and showed good agreement. A parametric study was carried out to investigate the effect of changing the yield strength of the steel and the concrete compressive strength on the moment of resistance of the section and the strain in the CFRP plate at ultimate.

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