scholarly journals An integrated numerical model for investigating guided waves in impact-damaged composite laminates

2017 ◽  
Vol 176 ◽  
pp. 945-960 ◽  
Author(s):  
B. Zhang ◽  
X.C. Sun ◽  
M.J. Eaton ◽  
R. Marks ◽  
A. Clarke ◽  
...  
Keyword(s):  
Numerical Model ◽  
Composite Laminates ◽  
Guided Waves

Ultrasonic reflection and guided waves in fluid-coupled composite laminates

1990 ◽  
Vol 9 (2-3) ◽  
pp. 51-69 ◽  
Author(s):  
D. E. Chimenti ◽  
Adnan H. Nayfeh
Keyword(s):  
Composite Laminates ◽  
Guided Waves

scholarly journals Numerical–Experimental Correlation of Impact-Induced Damages in CFRP Laminates

2019 ◽  
Vol 9 (11) ◽  
pp. 2372 ◽  
Author(s):  
Andrea Sellitto ◽  
Salvatore Saputo ◽  
Francesco Di Caprio ◽  
Aniello Riccio ◽  
Angela Russo ◽  
...  
Keyword(s):  
Numerical Model ◽  
Composite Laminates ◽  
Transverse Direction ◽  
Material Model ◽  
Low Velocity ◽  
Cfrp Laminates ◽  
Experimental Correlation ◽  
Out Of Plane ◽  
Impact Phenomena ◽  
The Impact

Composite laminates are characterized by high mechanical in-plane properties and poor out-of-plane characteristics. This issue becomes even more relevant when dealing with impact phenomena occurring in the transverse direction. In aeronautics, Low Velocity Impacts (LVIs) may occur during the service life of the aircraft. LVI may produce damage inside the laminate, which are not easily detectable and can seriously degrade the mechanical properties of the structure. In this paper, a numerical-experimental investigation is carried out, in order to study the mechanical behavior of rectangular laminated specimens subjected to low velocity impacts. The numerical model that best represents the impact phenomenon has been chosen by numerical–analytical investigations. A user defined material model (VUMAT) has been developed in Abaqus/Explicit environment to simulate the composite intra-laminar damage behavior in solid elements. The analyses results were compared to experimental test data on a laminated specimen, performed according to ASTM D7136 standard, in order to verify the robustness of the adopted numerical model and the influence of modeling parameters on the accuracy of numerical results.

scholarly journals Mode-I Fracture Behavior of CFRPs: Numerical Model of the Experimental Results

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 513 ◽  
Author(s):  
Claudia Barile ◽  
Caterina Casavola ◽  
Benedetto Gambino ◽  
Alessandro Mellone ◽  
Marco Spagnolo
Keyword(s):  
Numerical Model ◽  
Composite Laminates ◽  
High Performance ◽  
Mechanical Response ◽  
Numerical Models ◽  
Constitutive Relationship ◽  
Mode I ◽  
Experimental Calibration ◽  
Reinforced Plastics ◽  
High Performance Composite

In the last decades, the increasing use of laminate materials, such as carbon fibre reinforced plastics, in several engineering applications has pushed researchers to deeply investigate their mechanical behavior, especially in consideration of the delamination process, which could affect their performance. The need for improving the capability of the current instruments in predicting some collapse or strength reduction due to hidden damages leads to the necessity to combine numerical models with experimental campaigns. The validation of the numerical models could give useful information about the mechanical response of the materials, providing predictive data about their lifetime. The purpose of the delamination tests is to collect reliable results by monitoring the delamination growth of the simulated in situ cracking and use them to validate the numerical models. In this work, an experimental campaign was carried out on high performance composite laminates with respect to the delamination mode I; subsequently, a numerical model representative of the experimental setup was built. The ANSYS Workbench Suite was used to simulate the delamination phenomena and modeFRONTIER was applied for the numerical/experimental calibration of the constitutive relationship on the basis of the delamination process, whose mechanism was implemented by means of the cohesive zone material (CZM) model.

Fiber bragg grating based detection of part-thickness cracks in bent composite laminates using feature-guided waves

2019 ◽  
Vol 28 (8) ◽  
pp. 085026 ◽  
Author(s):  
Pabitro Ray ◽  
Xudong Yu ◽  
Zheng Fan ◽  
Balaji Srinivasan ◽  
Prabhu Rajagopal
Keyword(s):  
Fiber Bragg Grating ◽  
Composite Laminates ◽  
Guided Waves ◽  
Bragg Grating ◽  
Part Thickness

A Global–Local Numerical Model for the Prediction of Impact Induced Damage in Composite Laminates

2013 ◽  
Vol 21 (3) ◽  
pp. 457-466 ◽  
Author(s):  
A. Riccio ◽  
G. Di Felice ◽  
G. LaManna ◽  
E. Antonucci ◽  
F. Caputo ◽  
...  
Keyword(s):  
Numerical Model ◽  
Composite Laminates

Guided wave-based detection of delamination and matrix cracking in composite laminates

2010 ◽  
Vol 225 (1) ◽  
pp. 123-131 ◽  
Author(s):  
T Wandowski ◽  
P Malinowski ◽  
P Kudela ◽  
W Ostachowicz
Keyword(s):  
Composite Laminates ◽  
Guided Waves ◽  
Guided Wave ◽  
Matrix Cracking ◽  
Detection Methods ◽  
Localization Algorithm ◽  
Reflected Waves ◽  
Signal Processing Algorithms ◽  
Pulse Echo ◽  
Pulse Echo Method

The aim of this article was a numerical and experimental study of the active damage detection methods based on piezoelectric elements attached to a composite laminate. In considered case, guided waves were excited and received in a structure using pulse-echo method. It means that after exciting a structure with a pulse, an array of sensors located on a structure was used to ‘listen' for reflected waves coming from discontinuities. The main part of structural health monitoring system is signal-processing algorithms, which allow to detect and localize damage. Algorithm applied in this research results in special maps that indicate damage location. In this article, a damage localization algorithm was described and experimentally tested. The proposed method was successfully tested on a carbon—epoxy part of a helicopter.

Multiple Crack Detection of Pipes Using PZT-Based Guided Waves

2013 ◽  
Vol 448-453 ◽  
pp. 3702-3708 ◽  
Author(s):  
Shi Yan ◽  
Ji Qi ◽  
Nai Zhi Zhao ◽  
Yang Cheng ◽  
Sheng Wen Jun Qi
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Model ◽  
Crack Detection ◽  
Guided Waves ◽  
Arrival Time ◽  
Ultrasonic Guided Waves ◽  
Multiple Crack ◽  
Finite Element Software ◽  
Reflected Signal

This paper focuses on the multiple crack detection of steel pipelines using PZT-based guided waves. Numerical simulations of cracked pipes based on ultrasonic guided-waves are conducted by using the ANSYS finite element software. Based on the analysis of the reflected signal, the arrival time of the crack reflection waves are determined and the crack positions are accurately evaluated by the calculation of the travel time and group velocity of the PZT-based guided waves. The crack parameters are numerically altered to determine how the parameters impact the sensitive degree of the pipe crack damage. To validate the efficiency of the numerical simulation, an experiment of the multiple crack detection for the same parameter pipe with the numerical model is performed in the laboratory, and the results match well with the numerical simulation.

scholarly journals Numerical and Experimental Studies of High Strain Rate Mechanical Behavior of E-Glass/Polyester Composite Laminates

2010 ◽  
Author(s):  
Gozde Tunusoglu ◽  
Alper Tasdemirci ◽  
Mustafa Guden ◽  
I. W. Hall
Keyword(s):  
Numerical Model ◽  
High Strain Rate ◽  
Strain Rate ◽  
Composite Laminates ◽  
High Strain ◽  
Experimental Studies ◽  
Rate Sensitivity ◽  
Failure Strength ◽  
Polyester Composite ◽  
Strain Rate Loading

Quasi-static (∼10−3 s−1) and high strain rate (∼850 s−1) compression behavior of an E-glass/polyester composite was determined in the through-thickness and in-plane directions. In both directions, modulus and failure strength increased with increasing strain rate. Higher strain rate sensitivity for both elastic modulus and failure strength was observed in the inplane direction. A numerical model was developed to investigate the compressive deformation and fracture of an E-glass/polyester composite. Excellent agreement was demonstrated for the case of high strain rate loading. Also, the fracture geometries were successfully predicted with the numerical model.

scholarly journals Assessment of the Length and Depth of Delamination-Type Defects Using Ultrasonic Guided Waves

2020 ◽  
Vol 10 (15) ◽  
pp. 5236 ◽  
Author(s):  
Vykintas Samaitis ◽  
Liudas Mažeika ◽  
Regina Rekuvienė
Keyword(s):  
Composite Laminates ◽  
Guided Waves ◽  
Structural Integrity ◽  
Ultrasonic Method ◽  
Green Energy ◽  
Guided Wave ◽  
Engineering Structures ◽  
Length Estimation ◽  
The Difference ◽  
2D And 3D

Fiber-reinforced composite laminates are being increasingly used in various engineering components in the sectors of aerospace and green energy. Due to impacts throughout the service life of the structure, matrix breakage and delaminations significantly altering the structural integrity of the laminate can occur. Hence, robust guided wave structural health monitoring systems are required to ensure continuous safety of engineering structures. In this paper, the ultrasonic method based on the analysis of A0 mode reflecting within the defected area has been proposed to extract the length and the depth of the delamination-type defect. The technique proposed in this study extracts the depth of the damage by analyzing the magnitude variations of direct A0 mode which are caused by the difference of wave velocities in the upper and lower sub-laminates. This results in an altering and frequency-dependent forward-scattered amplitude of direct A0 mode. Furthermore, the proposed approach uses previously obtained information about the depth of the defect, which allows for the determination of the phase velocities of A0 and S0 modes in the upper and lower sub-laminates. As a result, the accuracy of the damage length estimation is increased. The performance of the proposed method was proven with 2D and 3D numerical simulations and experiments on samples with artificial defects. The method validation results showed that the proposed method with some limitations is capable of extracting the length of delamination with an approximate error below 6%.

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