Static strength and damage evaluation of high speed drilled composite material using acoustic emission and finite element techniques

Shahkhosravi, Naeim Akbari; Yousefi, Jalal; Najfabadi, Mehdi Ahmadi; Minak, Giangiacomo; Hosseini‐Toudeshky, Hossein; Sheibanian, Fariborz

doi:10.1016/j.engfracmech.2018.04.020

Cited by 13 publications

(3 citation statements)

References 46 publications

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“…Although the problem of drilling induced damage is common for all families of composites, the damage mode and the most influencing parameters depend on the type of composite. For instance, delamination has been reported as the critical damage mechanism in CFRPs [9][10][11][12][13] while in the case of biodegradable composite materials, fraying is much more important [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Aramid composites are increasingly used due to low density, heatresistant, high tensile strength, high hardness and resistance to corrosion and chemical agents [16]. This family of composites (mainly based in the commercial fiber Kevlar) is suitable for applications requiring elevated energy absorption capability in automotive, aeronautical [13,14] and naval industries [17] as well as military equipment and protection due to the rise of terrorism and international conflicts [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Experimental analysis of drilling induced damage in aramid composites

Díaz-Álvarez

Rodríguez-Millán

Díaz-Álvarez

et al. 2018

Composite Structures

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Aramid composites are increasingly used alone or combined with other composites in structural and personal protections due to the current demand of these applications against ballistic or fragment hazards. Drilling is a common operation required prior to mechanical joining of components, however this operation has been poorly analyzed in the case of aramid composites. Drilling induced damage of this family of composites is analyzed in the present work considering the effect of the drill geometry and cutting parameters. Fuzzing was the dominant damage mechanism both at hole entry and exit being also found delamination in most cases. Drill geometry and feed were influential parameters on resultant composite damage. Main contribution of this work is the ob-tainment of phenomenological expressions derived from experimental data, allowing the prediction of damage extension as a function of cutting parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental analysis of drilling induced damage in aramid composites

Díaz-Álvarez

Rodríguez-Millán

Díaz-Álvarez

et al. 2018

Composite Structures

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“…Qingwen You et al carried out drop hammer impact test and small mass impact test on composite laminates, and found that AE signal combined with empirical mode decomposition (EMD) can be used for real-time health monitoring [25]. Shahkhosravi et al proposed a very promising method based on AE and finite element (FE) techniques to evaluate the initiation and propagation of damage in high-speed drilled composite laminates [26]. Barile et al tested the ability of AE technology to detect unidirectional delamination of carbon fibre composites under double cantilever loads and found out the possible correlation between the frequency content of acoustic signals and damage evolution [27].…”

Section: Introductionmentioning

confidence: 99%

Location of Tensile Damage Source of Carbon Fiber Braided Composites Based on Two-Step Method

et al. 2019

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Acoustic emission (AE) source localization is one of the important purposes of nondestructive testing. The localization accuracy reflects the degree of coincidence between the identified location and the actual damage location. However, the anisotropy of carbon fiber three-dimensional braided composites will have a great impact on the accuracy of AE source location. In order to solve this problem, the time-frequency domain characteristics of AE signals in a carbon fiber braided composite tensile test were analyzed by Hilbert–Huang transform (HHT), and the corresponding relationship between damage modes and AE signals was established. Then, according to the time-frequency characteristics of HHT of tensile acoustic emission signals, the two-step method was used to locate the damage source. In the first step, the sound velocity was compensated by combining the time-frequency analysis results with the anisotropy of the experimental specimens, and the four-point circular arc method was used to locate the initial position. In the second step, there is an improvement of the Drosophila optimization algorithm, using the ergodicity of the chaotic algorithm and congestion adjustment mechanism in the fish swarm algorithm. The smoothing parameters and function construction in the probabilistic neural network were optimized, the number of iterations was reduced, the location accuracy was improved, and the damage mode of composite materials was obtained. Then, the damage location was obtained to achieve the purpose of locating the damage source.

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