A Sublaminate Model for Creep Buckling Analysis of Thick-Section FRP Composite Structures

2005 ◽  
Author(s):  
Anastasia Muliana ◽  
Rami Haj-Ali
Keyword(s):  
Composite Structures ◽  
Buckling Analysis ◽  
Thick Section ◽  
Frp Composite ◽  
Creep Buckling

3D Permeability of Thick-Section Glass Fabric Reinforced Polymer Composite by Vacuum-Assisted Resin Infusion Molding

2021 ◽  
pp. 1-15
Author(s):  
Ethan R Pedneau ◽  
Su Su Wang
Keyword(s):  
Wind Turbine ◽  
Composite Structures ◽  
Complex Geometry ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Glass Fabric ◽  
Thick Section ◽  
Flow Front ◽  
Resin Infusion ◽  
Principal Axes

Abstract Determination of permeability of thick-section glass fabric preforms with fabric layers of different architectures is critical for manufacturing large, thick composite structures with complex geometry, such as wind turbine blades. The thick-section reinforcement permeability is inherently three-dimensional and needs to be obtained for accurate composite processing modeling and analysis. Numerical simulation of the liquid stage of vacuum-assisted resin infusion molding (VARIM) is important to advance the composite manufacturing process and reduce processing-induced defects. In this research, the 3D permeability of thick-section E-glass fabric reinforcement preforms is determined and the results are validated by a comparison between flow front progressions from experiments and from numerical simulations using ANSYS Fluent software. The orientation of the principal permeability axes were unknown prior to experiments. The approach used in this research differs from those in literature in that the through-thickness permeability is determined as a function of flow front positions along the principal axes and the in-plane permeabilities and is not dependent on the inlet radius. The approach was tested on reinforcements with fabric architectures which vary through-the-thickness direction, such as those in a spar cap of a wind turbine blade. The computational simulations of the flow-front progression through-the-thickness were consistent with experimental observations.

Out-of-plane creep buckling analysis on slender concrete-filled steel tubular arches

2018 ◽  
Vol 140 ◽  
pp. 174-190 ◽  
Author(s):  
Yue Geng ◽  
Gianluca Ranzi ◽  
Yu-Tao Wang ◽  
Yu-Yin Wang
Keyword(s):  
Buckling Analysis ◽  
Creep Buckling ◽  
Out Of Plane

scholarly journals An Energy-Based Concept for Yielding of Multidirectional FRP Composite Structures Using a Mesoscale Lamina Damage Model

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 157 ◽  
Author(s):  
Seyed Rahimian Koloor ◽  
Atefeh Karimzadeh ◽  
Noorfaizal Yidris ◽  
Michal Petrů ◽  
Majid Ayatollahi ◽  
...  
Keyword(s):  
Yield Point ◽  
Composite Structures ◽  
Failure Modes ◽  
Initial Slope ◽  
Dissipation Energy ◽  
Fiber Failure ◽  
Damage Initiation ◽  
Frp Composite ◽  
Structural Applications ◽  
Evolution Curve

Composite structures are made of multidirectional (MD) fiber-reinforced polymer (FRP) composite laminates, which fail due to multiple damages in matrix, interface, and fiber constituents at different scales. The yield point of a unidirectional FRP composite is assumed as the lamina strength limit representing the damage initiation phenomena, while yielding of MD composites in structural applications are not quantified due to the complexity of the sequence of damage evolutions in different laminas dependent on their angle and specification. This paper proposes a new method to identify the yield point of MD composite structures based on the evolution of the damage dissipation energy (DDE). Such a characteristic evolution curve is computed using a validated finite element model with a mesoscale damage-based constitutive model that accounts for different matrix and fiber failure modes in angle lamina. The yield point of composite structures is identified to correspond to a 5% increase in the initial slope of the DDE evolution curve. The yield points of three antisymmetric MD FRP composite structures under flexural loading conditions are established based on Hashin unidirectional (UD) criteria and the energy-based criterion. It is shown that the new energy concept provides a significantly larger safe limit of yield for MD composite structures compared to UD criteria, in which the accumulation of energy dissipated due to all damage modes is less than 5% of the fracture energy required for the structural rupture.

scholarly journals Creep Buckling Analysis on Petroleum Furnace Tube Subjected to High Temperature Loading Based on ABAQUS

2020 ◽  
Vol 790 ◽  
pp. 012094
Author(s):  
Peng Yang ◽  
Haofeng Liang ◽  
Jiahui Zhou ◽  
Jie Sun ◽  
Chenyu Shi ◽  
...  
Keyword(s):  
High Temperature ◽  
Buckling Analysis ◽  
Creep Buckling ◽  
Furnace Tube
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