FRP Composite Structures

2021 ◽  
Author(s):  
Hota V. S. GangaRao ◽  
Woraphot Prachasaree
Keyword(s):  
Composite Structures ◽  
Frp Composite

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.

Glass Covered Magnetic Micro-Wires Operating in the Domain Wall Nucleation and Propagation Sensing Mode for Stress Detection in FRP Composite Structures

2014 ◽  
Vol 12 (10) ◽  
pp. 1481-1487
Author(s):  
Spiridon Konstantopoulos ◽  
Stelios Potirakis ◽  
Angelos Christopoulos ◽  
Ralf Schledjewski ◽  
Evangelos Hristoforou
Keyword(s):  
Domain Wall ◽  
Composite Structures ◽  
Stress Detection ◽  
Frp Composite

scholarly journals Experimental Identification of Statistical Correlation between Mechanical Properties of FRP Composite

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 674 ◽  
Author(s):  
Shufeng Zhang ◽  
Tongzhen Xing ◽  
Haibin Zhu ◽  
Xun Chen
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Accurate Determination ◽  
Correlation Coefficients ◽  
Field Method ◽  
Statistical Correlation ◽  
Image Correlation ◽  
Experimental Methodology ◽  
Fiber Reinforced ◽  
Frp Composite

Recent prediction on the heavy statistical correlation between the mechanical properties of fiber reinforced composite (FRP) raises new concerns on the accurate reliability evaluation of composite structures, but such statistical correlation still lacks experimental verification. In this work, an experimental methodology is proposed to determine the statistical correlation between mechanical properties of unidirectional FRP composite. A rectangular shaped carbon fiber reinforced plastic (CFRP) specimen with a circular hole is loaded by tension, and 3D digital image correlation (DIC) is employed to characterize the heterogeneous strain field around the hole. Virtual field method (VFM) is used to derive E11, E22, ν12, and G12 of specimens. Specimen configuration considering fiber angle and hole diameter is optimized to achieve accurate determination of correlation coefficients. Experimental results on the linear correlation coefficients between E11, E22, ν12, and G12 agree well with previous theoretical predictions.

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