A Review on Acoustic Emission Characterization of Failure Modes of Carbon Fiber Reinforced Composites

2018 ◽  
Vol 1148 ◽  
pp. 43-47 ◽  
Author(s):  
Vemu Vara Prasad ◽  
Javisseti Nageswara Rao
Keyword(s):  
Carbon Fiber ◽  
Failure Modes ◽  
Fiber Composite ◽  
Matrix Material ◽  
Acoustic Emissions ◽  
High Strength ◽  
Fiber Reinforced ◽  
Composite Sheet ◽  
Carbon Fiber Composite ◽  
Carbon Fiber Reinforced

Among various composites available for use, carbon fiber reinforced composite is unique in its Nature. Carbon fiber is an extremely strong thin fiber made by pyrolyzing synthetic fibers, such as rayon, until charred. High Strength Composites are made from this fiber by using appropriate matrix material mostly Epoxy resins are used. High Strength, stiffness, light weight and high thermal conductivity are the main advantages over the other composites. Making products with one single composite sheet is not possible always. Some of the intricate or complex shape making is required for joining of two composite sheet. The composites joining can be done in three ways mainly Adhesive, Riveting and Hybrid. Based on the Review among all these joints adhesive joining gives better economic solution in joining. Experimental results point to significant influence of fibre on mechanical properties of sample. The tensile test of the acoustic signal emission (AE) to identify the current state of material integrity in real time. Acoustic system signal correlated to damage events. The carbon fiber composite characteristic failure mechanisms are initiated on the microscale and result in a spontaneous release of elastic energy in terms of mechanical stress waves, the so-called acoustic emissions.

EFFECT OF RATE AND MODE OF LOADING ON STRENGTH AND STIFFNESS REINFORCED WITH CARBON FIBER REINFORCED PLASTICS

2016 ◽  
Vol 2 (1) ◽  
pp. 52-56
Author(s):  
Меркулов ◽  
Sergey Merkulov ◽  
Есипов ◽  
Stanislav Esipov
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
External Reinforcement ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Strength And Stiffness

This paper presents a method for evaluating the effect of loading parameters on the strength of ani-sotropic unidirectional carbon-fiber composite material under tension in the plane of orientation of the fibers. Experimentally studied mechanisms of deformation and fracture of the samples shows the dependence of the mechanical properties of reinforced carbon fiber reinforced plastics. The objective of the study is to determine the applicability of CFRP for strengthening by external reinforcement has lost the strength of the stretched zones of concrete elements, as well as analysis of the degree of influence of parameters of loading of the structures on their strength after amplification.

A Resistance Model of Carbon Fiber Composite Materials Based on Interfacial Effect

2014 ◽  
Vol 496-500 ◽  
pp. 2379-2382
Author(s):  
Jing Wu ◽  
Ai Qin Xu
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Interface Effect ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite ◽  
Resistance Change ◽  
Pull Out ◽  
Resistance Model ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

Based on the single fiber pull-out testing, the resistance of carbon fiber cement increases during the tensile test in elastic stage. Through the experiment, The fiber embedded length shorter, sample pullout strength is greater. But the resistance change rate is smaller, the lower the sensitivity of the sample. So, considering the fiber length and interface set interface effect of carbon fiber reinforced cement based composite resistance model. A simple model was proposed to explain the mechanism of compression sensitivity of carbon fiber reinforced cement-based composites based on interface effect. The results showed that the content of carbon fiber and interface strain can change the sensitivity of CFRC.

Composite Crash Box: Roll Wrap Fabrication and Dynamic Axial Crush Performance

2007 ◽  
Author(s):  
Alan L. Browne ◽  
Nancy L. Johnson ◽  
Mark E. Botkin
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Tubular Structures ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Front End ◽  
Axial Crush ◽  
Carbon Fiber Reinforced

A feature of many vehicles is a bolt-on, replaceable front end clip designed to protect the remaining structure in 0° to 30° frontal and offset crashes up to 15 km/hr (ECE-R42, European Danner (AZT), Allianze, VDS, or Thatcham Tests). The principle energy absorbing elements in such front clips are called crash or crush boxes. These are hollow cross section often tubular structures located between the bumper and the front ends of the lower rails. Previous studies of the dynamic axial crush response of carbon fiber reinforced composite tubes suggested that both the mass of the crash box and the amount of overhang of the front end clip could be reduced by switching from a metal to a carbon fiber reinforced composite crash box. The axial dimension of the crash box could theoretically be reduced because of the 20% reduction in stack-up exhibited by composite compared to metal tubular structures. The mass could theoretically be reduced because of the higher energy dissipation capability per unit mass of the carbon fiber composite and the shorter length that would be required. The initiative summarized in this paper was the roll wrapping portion of a one year program intended to prove out these benefits. Specifically, it encompassed the design, roll wrapping fabrication, and dynamic axial crush testing of a carbon fiber composite version of the crash box for a mid-size vehicle. All project goals were met. As first steps crush performance of the baseline Al crash box was determined and requirements were established for the geometry and crush force of the composite crash box, the needed crush force being 70 kN. To achieve the desired crush force levels while reducing mass by 20% compared to Al requires an SEA (specific energy absorption) on the order of 45. Crash box specimens manufactured with the roll wrapping process spanned a wide range of fiber architectures which were chosen based on findings of earlier crush tests of composite tubular specimens. Dynamic axial crush tests were then conducted on these specimens. Through these tests we were successful in identifying combinations of fiber type, fiber architecture, and tube wall thickness that simultaneously satisfied the multiple targets of high crush force, low stack-up (high crush efficiency), and reduced mass.

The Application of the Carbon Fiber Reinforced Polymer in the Bridge Construction

2013 ◽  
Vol 675 ◽  
pp. 165-168 ◽  
Author(s):  
Lei Chen
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Bridge Engineering ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite ◽  
Reinforced Polymer ◽  
Carbon Fiber Cloth ◽  
Carbon Fiber Reinforced

Researching new composite materials has become an important task in the construction industry. This paper introduced the present situation of the development of carbon fiber reinforced polymer and analyzed its advantages in mechanical property. It also introduced its two usages as carbon fiber composite cable and carbon fiber cloth in bridge engineering in detail.

The Carbon Fiber Composite Materials Application in Sports Equipment

2011 ◽  
Vol 341-342 ◽  
pp. 173-176 ◽  
Author(s):  
Li Na Sun ◽  
Zhen Deng
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite ◽  
Molding Process ◽  
Carbon Fiber Reinforced ◽  
Fiber Reinforced Material ◽  
Fiber Composite Materials

This paper introduces the carbon fiber and carbon fiber reinforced material performance, and expounds the molding process and introduces the current carbon fiber composite application in sports equipment.

A micromechanical model of carbon fiber-reinforced plastic and steel hybrid laminate composites

2021 ◽  
pp. 002199832110075
Author(s):  
Minchang Sung ◽  
Hyunchul Ahn ◽  
Jinhyeok Jang ◽  
Dongil Kwon ◽  
Woong-Ryeol Yu
Keyword(s):  
Carbon Fiber ◽  
Compressive Stress ◽  
Fracture Strain ◽  
Matrix Material ◽  
Micromechanical Model ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Hybrid Laminate

The fracture strain of carbon fiber-reinforced plastics (CFRPs) within CFRP/steel hybrid laminate composites is reportedly higher than that of CFRPs due to transverse compressive stress induced by the steel lamina. A micromechanical model was developed to explain this phenomenon and also to predict the mechanical behavior of CFRP/steel hybrid laminate composites. First, the shear lag theory was extended to calculate stress distributions on fibers and matrix material in a CFRP under multiaxial stress condition, considering three deformation states of matrix (elastic and plastic deformation and fracture) and the transverse compressive stress. Then, the deformation behavior of CFRP was predicted using average stress in the ineffective region and the Weibull distribution of carbon fibers. Finally, the mechanical properties of CFRP/steel hybrid laminate composites were predicted by considering the thermal residual stress generated during the manufacturing process. The micromechanical model revealed that increased transverse compressive stress decreases the ineffective lengths of partially broken fibers in the CFRP and results in increased fracture strain of the CFRP, demonstrating the validity of the current micromechanical model.

Numerical and experimental evaluation of mechanical performance of the multifunctional energy storage composites

2021 ◽  
pp. 002199832110495
Author(s):  
Yinan Wang ◽  
Fu-Kuo Chang
Keyword(s):  
Energy Storage ◽  
Carbon Fiber ◽  
Composite Laminates ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Fiber Composite ◽  
Mechanical Damage ◽  
Experimental Tests ◽  
Structural Element ◽  
Carbon Fiber Composite

This work presents numerical simulation methods to model the mechanical behavior of the multifunctional energy storage composites (MESCs), which consist of a stack of multiple thin battery layers reinforced with through-the-hole polymer rivets and embedded inside carbon fiber composite laminates. MESC has been demonstrated through earlier experiments on its exceptional behavior as a structural element as well as a battery. However, the inherent complex infrastructure of the MESC design has created significant challenges in simulation and modeling. A novel homogenization technique was adopted to characterize the multi-layer properties of battery material using physics-based constitutive equations combined with nonlinear deformation theories to handle the interface between the battery layers. Second, mechanical damage and failure modes among battery materials, polymer reinforcements, and carbon fiber-polymer interfaces were characterized through appropriate models and experiments. The model of MESCs has been implemented in a commercial finite element code in ABAQUS. A comparison of structural response and failure modes from numerical simulations and experimental tests are presented. The results of the study showed that the predictions of elastic and damage responses of MESCs at various loading conditions agreed well with the experimental data. © 2021

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