Analysis of Fiber-Reinforced Composite Beams Under Temperature Environment

2009 ◽  
Vol 32 (4) ◽  
pp. 311-321 ◽  
Author(s):  
K. A. Syed ◽  
C. W. Su ◽  
W. S. Chan
Keyword(s):  
Composite Beams ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Temperature Environment

Damage Detection in Fiber-Reinforced Composite Beams by Using a Bayesian Fusion Method

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
U. Baneen ◽  
J. E. Guivant
Keyword(s):  
Damage Detection ◽  
Composite Beam ◽  
Simulated Data ◽  
Composite Beams ◽  
Optimal Sampling ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Damage Indices ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

This paper presents a method for the detection of damage present in composite beam-type structures. The method, which successfully detected damage in steel beams, is applied to a glass fiber-reinforced beam in order to verify its suitability for composite structures as well. The damage indices were obtained using the gapped-smoothing method (GSM), which does not require a baseline model in order to detect damage. Despite the advantage of avoiding the need for a reference model altogether, unavoidable measurement errors make GSM rather ineffective. The proposed method uses the damage indices that GSM provides for synthesizing a set of likelihood functions that is processed under a Bayesian approach in order to reduce the effect of the noise and other uncertainty sources. The quality of the damage detection was examined by investigating an optimal sampling size analytically, and it was demonstrated through numerical simulation. This paper details the theory of the noise suppression method based on Bayesian data fusion, includes an analysis of the optimal sampling size, and presents the experimental results for two glass fiber-reinforced composite beams with a narrow and wide delamination, respectively. A noise-addition process was applied to the simulated data considering two different noise distributions. The composite beam was modeled in ANSYS, and harmonic analysis was used to obtain the frequency response functions at different beam locations. The results were obtained by adding 5, 10, and 15% noise in the simulated data, and they were then validated from the experimental results.

Nondestructive health monitoring of cracked simply supported fiber-reinforced composite structures

2011 ◽  
Vol 22 (18) ◽  
pp. 2207-2214 ◽  
Author(s):  
Mohamed S. Gaith
Keyword(s):  
Health Monitoring ◽  
Composite Structures ◽  
Crack Depth ◽  
Composite Beams ◽  
Mode Shapes ◽  
Crack Identification ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Simply Supported ◽  
Reinforced Composite

A crack on a structural member introduces a local flexibility that is a function of crack depth. This flexibility changes the dynamic behavior of the system and its stability characteristics. A continuous cracked beam vibration theory is implemented for the lateral vibration of cracked Euler–Bernoulli beams with single-edge open cracks. In this study, the crack identification (health monitoring) for simply supported graphite/epoxy fiber-reinforced composite beams is considered. The effects of crack depth and location, fiber orientation, and fiber volume fraction on the flexibility and consequently on natural frequency and mode shapes for cracked fiber-reinforced composite beams are investigated.

scholarly journals An Investigation of Crack Propagation in Steel Fiber-Reinforced Composite Beams

2018 ◽  
Author(s):  
Adam Soto ◽  
Fariborz M. Tehrani
Keyword(s):  
Composite Beam ◽  
Peak Load ◽  
Experimental Studies ◽  
Fiber Reinforcement ◽  
Composite Beams ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Premature Failure ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

This paper investigates the cracking phenomena of fiber-reinforced concrete in steel and concrete composite beam systems. Various parameters contribute to the crack development and weakening of the composite system, while the concrete slab is bonded to the steel beam. The weakening can result from the longitudinal shear stress that causes cracking from shear connectors, cracking from tensile forces, crushing due to compressive forces and also cracking from concrete shrinkage. These cracks can contribute to premature failure of the composite beam. This paper investigates fiber reinforcement as a solution to decrease the amount of cracking in composite beams. The presented methodology includes experimental studies to evaluate cracking characteristics and strength of fiber-reinforced composite beams. Parameters of the study included spacing between studs, application of welded wire reinforcement, and fiber reinforcement. Results indicate the effectiveness of fiber-reinforcement in reducing crack widths and number of cracks, even though, spacing between studs and presence of welded wire were essential in crack control. Further, fiber-reinforced specimens showed higher compressive and tensile strength by 30% and 70% respectively. The deflection at the peak load also showed a 23% decrease for the specimen with hybrid fiber-wire reinforcement in comparison with the specimen reinforced with welded wire only.

On Line Health Monitoring for Cracked Simply Supported Fiber Reinforced Composite Structures

2010 ◽  
Author(s):  
Mohamed S. Gaith ◽  
Ahmad Zaben ◽  
Naeem Bawayah ◽  
Yazan Israwi ◽  
Mosa’ab Farraj
Keyword(s):  
Health Monitoring ◽  
Crack Depth ◽  
Composite Beams ◽  
Mode Shapes ◽  
Crack Identification ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Simply Supported ◽  
Reinforced Composite ◽  
On Line

A crack in structural member introduces local flexibility which is function of crack depth and location. This flexibility changes the dynamic behavior of the system and its stability characteristics. A continuous cracked beam vibration theory is implemented for the lateral vibration of cracked Euler–Bernoulli beams with single-edge open cracks. In this work, the crack identification as on line health monitoring for simply supported graphite/epoxy fiber reinforced composite beams is considered. The effects of crack depth and location, fiber orientation, and fiber volume fraction on the flexibility and consequently on natural frequency and mode shapes for cracked fiber reinforced composite beams are investigated.

Analysis of periodic laminated fiber-reinforced composite beams in free vibration

2021 ◽  
pp. 107754632110286
Author(s):  
Peter L Bishay ◽  
Julian Rodriguez
Keyword(s):  
Finite Element ◽  
Dynamic Behavior ◽  
Fiber Orientation ◽  
Periodic Structures ◽  
Composite Beams ◽  
Segment Length ◽  
Fiber Reinforced ◽  
Laminated Shell ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

The dynamic behavior of solid structures is an important aspect that must be considered in the design phase to ensure that the designed structure will have desired response under external excitation. Periodic structures offer various design possibilities that can tailor the dynamic behavior of the structure to match the desired response under a given applied excitation. The use of laminated fiber-reinforced composite materials in periodic structures further increases the design degrees of freedom by introducing new design parameters, such as the number of plies in each periodic patch and their fiber-orientation angles. In this article, the classical lamination theory is integrated with the forward approach of the wave finite element method to analyze periodic fiber-reinforced composite beams in flexural vibration. Since Euler–Bernoulli’s beam theory is used, the proposed approach is much simpler and computationally efficient than using laminated shell finite elements. The article shows the effects of the number of periodic cells, the segment length ratio, the number of plies in each periodic patch, and their fiber-orientation on the first stop band of the beam. The results reported can guide the design of such structures to attenuate vibration amplitudes at specific target frequency bands and avoid undesired dynamic responses. Results have been validated in the 0–2000 Hz frequency range by comparison with finite element laminated shell models.

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