Strain Rate Sensitivity of Fiber-Reinforced Cementitious Composites

2016 ◽  
Vol 113 (2) ◽  
Author(s):  
Hesham Othman ◽  
H. Marzouk
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Fiber Reinforced Cementitious Composites

scholarly journals Strain rate sensitivity of ultra-high performance fiber reinforced concrete

2021 ◽  
Author(s):  
Aria Aghajani-Namin
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
High Performance ◽  
Rate Sensitivity ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Dynamic Domain

Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) is relatively new cementitious material, which has been developed to enhance material performance such as, durability, workability and strength. UHP-FRC has an outstanding dynamic performance with high capacity to absorb damage. Because of its superior performance under dynamic loading, UHP-FRC has been induced in structures where dynamic resistance is required. It is proven that like other concrete materials, UHP-FRC strength increases significantly when subjected to high strain rates. The objective of this study is to develop understanding of strain rate sensitivity of UHP-FRC with 2% steel fiber by volume fraction and plain High Strength Concrete (HSC). Compressive and flexural tensile strength of each concrete composite were investigated to evaluate and compare their strain rate sensitivity through dynamic increase factor (DIF). The specimens were tested under six different strain rates; three in quasi-static and three in dynamic domain. Strain rates in quasi-static domain conducted by MTS test machine and strain rates in dynamic domain conducted using the drop hammer technique. The test results revealed that UHP-FRC exhibits less strain rate sensitivity while HSC show much higher rate sensitivity in comparison to other materials.

scholarly journals Strain rate sensitivity of ultra-high performance fiber reinforced concrete

2021 ◽  
Author(s):  
Aria Aghajani-Namin
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
High Performance ◽  
Rate Sensitivity ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Dynamic Domain

Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) is relatively new cementitious material, which has been developed to enhance material performance such as, durability, workability and strength. UHP-FRC has an outstanding dynamic performance with high capacity to absorb damage. Because of its superior performance under dynamic loading, UHP-FRC has been induced in structures where dynamic resistance is required. It is proven that like other concrete materials, UHP-FRC strength increases significantly when subjected to high strain rates. The objective of this study is to develop understanding of strain rate sensitivity of UHP-FRC with 2% steel fiber by volume fraction and plain High Strength Concrete (HSC). Compressive and flexural tensile strength of each concrete composite were investigated to evaluate and compare their strain rate sensitivity through dynamic increase factor (DIF). The specimens were tested under six different strain rates; three in quasi-static and three in dynamic domain. Strain rates in quasi-static domain conducted by MTS test machine and strain rates in dynamic domain conducted using the drop hammer technique. The test results revealed that UHP-FRC exhibits less strain rate sensitivity while HSC show much higher rate sensitivity in comparison to other materials.

Determination of flexural properties of hybrid composite using Cowper-Symonds rate-dependent material model

2021 ◽  
pp. 002199832110386
Author(s):  
Engin Erbayrak
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Hybrid Composite ◽  
Composite Laminates ◽  
Rate Sensitivity ◽  
Material Model ◽  
Flexural Behavior ◽  
Flexural Properties ◽  
Strain Rates ◽  
Fiber Reinforced

This study addressed to determine the flexural properties of hybrid composite laminates (HCAFRE) under the strain rate sensitivity. The hybrid composite laminate was formed as consecutive stacking of a sequence of plain woven carbon fiber reinforced epoxy (CFRE) and a plain-woven aramid fiber reinforced epoxy (AFRE) laminates. The flexural tests were carried out at four different strain rates (0.01, 0.11, 0.55, 1.1 s−1) to determine the strain rate sensitivity of the HCAFRE. Moreover, the strain rate sensitivity of CFRE and AFRE was also determined individually. The effect of different fiber orientations (0°, 45°, and 90°) on the flexural properties of the composite laminates were also investigated at the scope of this study. In numerical analysis, composite laminates (CFRE, AFRE, and HCAFRE) were constituted in LS-DYNA finite element program using the Cowper-Symonds material model (MAT 112) which includes strain rate dependency. Consequently, it was seen that the experimental and numerical results were indicated a similar tendency to each other. Therefore, it was understood that the Cowper-Symonds material model is suited for the flexural behavior model of composite laminates under different strain rates.

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