Strain rate effects on the compressive and tensile behavior of bundle-type polyamide fiber-reinforced cementitious composites

2019 ◽  
Vol 160 ◽  
pp. 50-65 ◽  
Author(s):  
Hongseop Kim ◽  
Gyuyong Kim ◽  
Sangkyu Lee ◽  
Minjae Son ◽  
Gyeongcheol Choe ◽  
...  
Keyword(s):  
Strain Rate ◽  
Tensile Behavior ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Polyamide Fiber ◽  
Fiber Reinforced Cementitious Composites

Strain Rate Effects on Tensile Properties of Fiber Reinforced Concrete

1985 ◽  
Vol 64 ◽  
Author(s):  
George G. Nammur ◽  
Antoine E. Naaman
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Volume Fraction ◽  
Tensile Tests ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
The Matrix

ABSTRACTHigh strain rates lead to substantial modifications in the stress-strain (or stress-displacement) response of fiber reinforced concrete in tension. These modifications include higher strength and corresponding strain, as well as smaller displacement at failure.The purpose of this paper is to investigate the behavior of fiber reinforced concrete under impact tensile loading, and to study the effect of strain rate on the post-cracking strength of the composite. The variation of the tensile strength of the matrix with the reinforcement parameters such as volume fraction Vf and aspect ratio |/φ of the fibers is also studied ip this paper. A special emphasis is placed on the stress-displacement relationship of steel fiber reinforced concrete in its post-cracking range. An empirical model of the stress- displacement relationship as a function of the strain rate is developed from experimental data from tensile tests on dogbone shape notched tensile prisms. The model highlights the effects of strain rate and fiber properties on the post-cracking strength of the composite, as well as the displacement at failure. The effect of strain rate on the post-cracking toughness of fiber reinforced concrete is also addressed. The literature on impact effects on concrete in tension (plain and fiber reinforced) is briefly reviewed in this paper, and so is the state of the art of testing techniques for strain rate effects.

scholarly journals Strain rate effects on ultra high performance fiber reinforced concrete (UHP-FRC) with various fiber contents

2021 ◽  
Author(s):  
Sayed-Mohammad Banitabaei-Koupaei
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
High Performance Fiber

Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) was introduced in the mid-1990s and has made striking advances in recent years. Ductal® is a UHP-FRC technology that offers a unique combination of characteristics including but, not limited to ductility, strength and durability, while providing highly moldable products with quality surfaces. Compressive strengths, and equivalent flexural strengths reach up to 200 and 40 MPa, respectively. UHP-FRC also shows an outstanding performance under dynamic loading in structures subjected to extreme loading conditions such as impact, earthquake and blast. Moreover, UHP-FRC indicates an optimized combination of properties for a specific application. Three series of tests including compression, indirect tension, and flexure were conducted under various strain rates from quasi-static to dynamic loading with low strain rates. The objective of this project is to enhance knowledge of strain rate effects on UHP-FRC with various fiber contents and to report Dynamic Increase Factor (DIF).

scholarly journals Strain rate effects on ultra high performance fiber reinforced concrete (UHP-FRC) with various fiber contents

2021 ◽  
Author(s):  
Sayed-Mohammad Banitabaei-Koupaei
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
High Performance Fiber

Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) was introduced in the mid-1990s and has made striking advances in recent years. Ductal® is a UHP-FRC technology that offers a unique combination of characteristics including but, not limited to ductility, strength and durability, while providing highly moldable products with quality surfaces. Compressive strengths, and equivalent flexural strengths reach up to 200 and 40 MPa, respectively. UHP-FRC also shows an outstanding performance under dynamic loading in structures subjected to extreme loading conditions such as impact, earthquake and blast. Moreover, UHP-FRC indicates an optimized combination of properties for a specific application. Three series of tests including compression, indirect tension, and flexure were conducted under various strain rates from quasi-static to dynamic loading with low strain rates. The objective of this project is to enhance knowledge of strain rate effects on UHP-FRC with various fiber contents and to report Dynamic Increase Factor (DIF).

scholarly journals Review of Strain Rate Effects of Fiber-Reinforced Polymer Composites

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2839
Author(s):  
Lulu Ma ◽  
Feng Liu ◽  
Dongyu Liu ◽  
Yaolu Liu
Keyword(s):  
Strain Rate ◽  
Numerical Models ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Frp Composites ◽  
Rate Dependent ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Rate Effects

The application of fiber-reinforced polymer (FRP) composites is gaining increasing popularity in impact-resistant devices, automotives, biomedical devices and aircraft structures due to their high strength-to-weight ratios and their potential for impact energy absorption. Impact-induced high loading rates can result in significant changes of mechanical properties (e.g., elastic modulus and strength) before strain softening occurs and failure characteristics inside the strain localization zone (e.g., failure mechanisms and fracture energy) for fiber-reinforced polymer composites. In general, these phenomena are called the strain rate effects. The underlying mechanisms of the observed rate-dependent deformation and failure of composites take place among multiple length and time scales. The contributing mechanisms can be roughly classified as: the viscosity of composite constituents (polymer, fiber and interfaces), the rate-dependency of the fracture mechanisms, the inertia effects, the thermomechanical dissipation and the characteristic fracture time. Numerical models, including the viscosity type of constitutive models, rate-dependent cohesive zone models, enriched equation of motion and thermomechanical numerical models, are useful for a better understanding of these contributing factors of strain rate effects of FRP composites.

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