scholarly journals Analysis of the Dynamic Response in Blast-Loaded CFRP-Strengthened Metallic Beams

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Zhenyu Wang ◽  
Yang Zhao ◽  
Xu Liang ◽  
Zhiguo He
Keyword(s):  
Failure Modes ◽  
Fiber Reinforced Polymer ◽  
Large Strains ◽  
Fe Model ◽  
Strain Rates ◽  
Metallic Structures ◽  
Hybrid Beam ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Full Interaction

Carbon fiber-reinforced polymer composites (CFRPs) are good candidates in enhancing the blast resistant performance of vulnerable public buildings and in reinforcing old buildings. The use of CFRP in retrofitting and strengthening applications is traditionally associated with concrete structures. Nevertheless, more recently, there has been a remarkable aspiration in strengthening metallic structures and components using CFRP. This paper presents a relatively simple analytical solution for the deformation and ultimate strength calculation of hybrid metal-CFRP beams when subjected to pulse loading, with a particular focus on blast loading. The analytical model is based on a full interaction between the metal and the FRP and is capable of producing reasonable results in a dynamic loading scenario. A nonlinear finite element (FE) model is also developed to reveal the full dynamic behavior of the CFRP-epoxy-steel hybrid beam, considering the detailed effects, that is, large strains, high strain rates in metal, and different failure modes of the hybrid beam. Experimental results confirm the analytical and the FE results and show a strong correlation.

Superelastic Shape Memory Alloy Fiber-Reinforced Polymer Composites

2016 ◽  
Author(s):  
Sherif M. Daghash ◽  
Osman E. Ozbulut
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory ◽  
Failure Modes ◽  
Tensile Tests ◽  
Fiber Reinforced Polymer ◽  
Fatigue Properties ◽  
Uniaxial Tensile ◽  
Large Strains ◽  
Fiber Reinforced ◽  
Reinforced Polymer

Fiber reinforced polymer (FRP) composites have been increasingly used in engineering applications due to their lightweights, high strength, and high corrosion resistance. However, the conventional FRPs exhibits brittle failure, low toughness, limited fatigue strength, and relatively low ultimate tensile strains. Shape memory alloys (SMAs) are a class of metallic alloys that can recover large strains upon load removal with minimal residual deformations. Besides their ability to recover large deformations, SMAs possess excellent corrosion resistance, good energy dissipation capacity, and high fatigue properties. This study explores the use of superelastic SMA fibers to reinforce a thermoset polymer matrix to produce a polymer composite with enhanced mechanical properties. Nickel-Titanium wires with a diameter of 495 micrometer are used as fibers. SMA coupons with different reinforcement ratios are fabricated using a special-made mold and following a modified hand lay-up technique. The uniaxial tensile tests are conducted under cyclic loading protocols. The results of the tests are assessed in terms of ultimate strength, ultimate strain, residual strain, and failure modes of the composites.

Assesment of Proposed Models for Determining Allowable FRP Tensile Strain for Mitigation of Debonding Failure in FRP-Strengthened RC Beams

2011 ◽  
Vol 311-313 ◽  
pp. 1945-1948
Author(s):  
Gui Bing Li ◽  
Yu Gang Guo ◽  
Xiao Yan Sun
Keyword(s):  
Polymer Composites ◽  
Failure Mode ◽  
Tensile Strain ◽  
Failure Modes ◽  
Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Externally Bonded ◽  
High Level

intermediate crack-induced debondingis one of the most dominant failure modes in FRP-strengthened RC beams. Different code models or provisions have been proposed to mitigateintermediate crack-induced debondingfailure.However, these code models or provisions cannot mitigate this failure mode properly. Recently, mew models have been proposed.Out of all the existing proposed models, five typical ones are investigated in the current study. These main available proposed models for mitigating debonding failure of externally bonded fiber reinforced polymer composites appliedto concrete is evaluated based on data obtained from experimental programs. It is shown that all the evaluated proposed models exhibit a high level of dispersion, they are not suitable for limiting the allowable tensile strain at the initiation of debondingof FRP laminates.

Evaluation of Allowable FRP Tensile Strain in Main Codes for Mitigation of Debonding Failure in FRP-Strengthened RC Beams

2011 ◽  
Vol 71-78 ◽  
pp. 1469-1472
Author(s):  
Gui Bing Li ◽  
Yu Gang Guo ◽  
Xiao Yan Sun
Keyword(s):  
Polymer Composites ◽  
Tensile Strain ◽  
Failure Modes ◽  
Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Flexural Members ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Externally Bonded ◽  
Code Provisions

Intermediate crack-induced debonding is one of the most dominant failure modes in FRP-strengthened RC beams. Different code models and provisions have been proposed to mitigate intermediate crack-induced debonding failure. Out of all the existing code provisions and models, six typical ones are investigated in the current study. These available guidance for mitigating debonding failure of externally bonded fiber reinforced polymer composites applied to concrete is evaluated based on data obtained from experimental programs. It is shown that the current recommendations are inadequate to effectively mitigate intermediate crack-induced debonding in flexural members.

scholarly journals Importance of Interfacial Adhesion Condition on Characterization of Plant-Fiber-Reinforced Polymer Composites: A Review

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 438
Author(s):  
Ching Hao Lee ◽  
Abdan Khalina ◽  
Seng Hua Lee
Keyword(s):  
Thermal Properties ◽  
Polymer Composites ◽  
Interfacial Adhesion ◽  
Fiber Reinforced Polymer ◽  
Plant Fiber ◽  
Plant Fibers ◽  
Natural Plant ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Adhesion Condition

Plant fibers have become a highly sought-after material in the recent days as a result of raising environmental awareness and the realization of harmful effects imposed by synthetic fibers. Natural plant fibers have been widely used as fillers in fabricating plant-fibers-reinforced polymer composites. However, owing to the completely opposite nature of the plant fibers and polymer matrix, treatment is often required to enhance the compatibility between these two materials. Interfacial adhesion mechanisms are among the most influential yet seldom discussed factors that affect the physical, mechanical, and thermal properties of the plant-fibers-reinforced polymer composites. Therefore, this review paper expounds the importance of interfacial adhesion condition on the properties of plant-fiber-reinforced polymer composites. The advantages and disadvantages of natural plant fibers are discussed. Four important interface mechanism, namely interdiffusion, electrostatic adhesion, chemical adhesion, and mechanical interlocking are highlighted. In addition, quantifying and analysis techniques of interfacial adhesion condition is demonstrated. Lastly, the importance of interfacial adhesion condition on the performances of the plant fiber polymer composites performances is discussed. It can be seen that the physical and thermal properties as well as flexural strength of the composites are highly dependent on the interfacial adhesion condition.

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