Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

2021 ◽  
Author(s):  
Yuzhu Guo ◽  
Xudong Chen ◽  
Yu Tang ◽  
Jin Wu
Keyword(s):  
Acoustic Emission ◽  
Steel Fiber ◽  
Damage Identification ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Visual Damage ◽  
Concrete Cylinders

The Failure of Carbon Fiber Reinforced Composite Analyzed by Acoustic Emission

2020 ◽  
Vol 405 ◽  
pp. 205-211
Author(s):  
Vladimír Mára ◽  
Jan Krčil ◽  
Lenka Michalcová ◽  
Elena Čižmárová
Keyword(s):  
Acoustic Emission ◽  
Carbon Fiber ◽  
Mechanical Test ◽  
Metallographic Analysis ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Damage And Failure ◽  
Reinforced Composite ◽  
Carbon Fiber Reinforced ◽  
Damage Processes

This paper focus on evaluation of behavior, damage and failure processes occurring during the loading cycles in the carbon fiber reinforced composite by acoustic emission method. Since acoustic emission is physical phenomenon that detects the released energy in form of waves spreading through the material due to stimulation of material by external or internal stress, it is possible to evaluate complex damage and failure processes. For that purpose, the standard and open holes tensile testing specimens with different number of plies were manufactured. Selected acoustic emission parameters were correlated with data obtained from mechanical test. Linear localization method together with signal analysis using Fast Fourier transform algorithm were used as another tool for detection and evaluation of spreading damage processes inside the composite during the load. Basic damage types inside the composite material were identified by metallographic analysis using light microscopy. More complex damage processes were observed on the fracture surface using stereomicroscopy and scanning electron microscopy.

An equivalent elastoplastic damage model based on micromechanics for hybrid fiber-reinforced composites under uniaxial tension

2017 ◽  
Vol 28 (1) ◽  
pp. 79-117 ◽  
Author(s):  
Zhi-guo Yan ◽  
Yao Zhang ◽  
J Woody Ju ◽  
Qing Chen ◽  
He-hua Zhu
Keyword(s):  
Steel Fiber ◽  
Damage Model ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Multiple Cracking ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Polyethylene Fiber ◽  
Tensile Performance

A micromechanics-based equivalent elastoplastic damage model for both notch-sensitive and multiple cracking hybrid fiber reinforced composite is proposed in this study. In this model, the elastic modulus, first cracking strength, and ultimate strength are estimated based on micromechanics. To quantify strain after matrix cracks, a novel characteristic length is defined based on the damage mechanics. The effects of the fiber length, diameter and modulus, and interfacial bond stress on the characteristic length of hybrid fiber reinforced composite are presented. In order to avoid the difficulty of determining the traditional damage and plastic potential function, this model is developed from the behavior of single fiber at mesolevel to the response of hybrid fiber reinforced composite at macrolevel. Then the calculated results are verified with several published experimental results of fiber reinforced composites and hybrid fiber reinforced composite, including notch-sensitive cracking fiber reinforced composite, multiple cracking fiber reinforced composite, and multiple cracking hybrid fiber reinforced composite reinforced with two types of fibers (steel fiber and polyethylene fiber). A parametric study has been performed to investigate the effects of the fiber properties, including the fiber volume fraction, length, diameter, and interfacial bond stress, on the tensile performance of hybrid fiber reinforced composite reinforced with steel fiber-like and polyethylene fiber-like fibers. The results indicate that enhancement of the tensile performance can be achieved more effectively by improving the polyethylene fiber-like fiber than steel fiber-like fiber.

Application of Acoustic Emission Technology in Material Detection

2012 ◽  
Vol 569 ◽  
pp. 233-237
Author(s):  
Chun Lei Zhang ◽  
Kun Qiao ◽  
Bo Zhu ◽  
Ben Xie ◽  
Zhi Tao Lin ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Carbon Fiber ◽  
Failure Mechanism ◽  
Material Properties ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Material Detection ◽  
Carbon Fiber Reinforced ◽  
Acoustic Emission Technology

The principle of acoustic emission (AE) technology was introduced in this work, as well as the application and the achievements of AE in recent years, such as the utilization in unidirectional carbon fiber reinforced composite. References for in-depth research of material properties and failure mechanism were provided in this article.

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