An Experimental and Numerical Investigation to Characterize an Aerospace Composite Material with Open-Hole Using Non-Destructive Techniques

Feito, Norberto; Calvo, José Vicente Peña; Belda, Ricardo; Giner, Eugenio

doi:10.3390/s20154148

Cited by 9 publications

(8 citation statements)

References 72 publications

(93 reference statements)

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“…Even though not explicated, a damage index for optical methods can be written as:

where

and

are the deformations in the undamaged and damaged state, with i and j the directions of measurement. The DIC is among the most promising techniques for the nondestructive characterization of composites [ 72 , 73 ]. In the literature, its application at the microscale of carbon fiber composites has been also investigated [ 74 ].…”

Section: Optical Methodsmentioning

confidence: 99%

Residual Properties in Damaged Laminated Composites through Nondestructive Testing: A Review

et al. 2021

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The development of damage tolerance strategies in the design of composite structures constitutes a major challenge for the widespread application of composite materials. Damage tolerance approaches require a proper combination of material behavior description and nondestructive techniques. In contrast to metals, strength degradation approaches, i.e., the residual strength in presence of cracks, are not straightforwardly enforceable in composites. The nonhomogeneous nature of such materials gives rise to several failure mechanisms and, therefore, the definition of an ultimate load carrying capacity is ambiguous. Nondestructive techniques are thus increasingly required, where the damage severity is quantified not only in terms of damage extension, but also in terms of material response of the damaged region. Based on different approaches, many nondestructive techniques have been proposed in the literature, which are able to provide a quantitative description of the material state. In the present paper, a review of such nondestructive techniques for laminated composites is presented. The main objective is to analyze the damage indexes related to each method and to point out their significance with respect to the residual mechanical performances, as a result of the working principle of each retained technique. A possible guide for future research on this subject is thus outlined.

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“…Even though not explicated, a damage index for optical methods can be written as:

where

and

Section: Optical Methodsmentioning

confidence: 99%

Residual Properties in Damaged Laminated Composites through Nondestructive Testing: A Review

et al. 2021

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“…Moreover, its accuracy is inevitably affected by uncontrollable energy dissipation [ (8)(9)(10)]. DIC, an optical based image stress analysis method, has been used combining with IRT to study thermomechanical coupling effects [ (11)(12)(13)]. Nonetheless, there are seldom researches have been done about applying this synchronous detecting system in SIF detection, which requires high accuracy of point stress state measurement.…”

Section: Introductionmentioning

confidence: 99%

IRT and DIC Synchronous Detection of Stress Intensity Factors and Plastic Zone Ranges

Chen

Huang

2023

J. Phys.: Conf. Ser.

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To achieve non-contact in situ detection of stress intensity factors (SIF), this paper innovatively adopts the advanced IRT and DIC synchronous detecting system to measure SIFs as using plastic zone range to assist in determining the state of stress fields. Though this synchronous detecting method has been applied to analyze thermomechanical coupling effects of materials, it has never been used to detect SIFs, which requires a high accuracy of point stress state detection. Thus, to testify its feasibility and accuracy in SIF detection, three engineering materials were subjected to various loading conditions to provide sufficient verification. Firstly, the coefficients of volumetric strain and temperature change of different materials were calibrated by thermocouple and infrared thermography. Then, the compact tensile specimens were subjected to high-speed loading, of which the SIFs and plastic zone ranges were computed by taking several measurement points on infrared and deformation images. Compared with the theoretical values, the errors of the SIF and K-dominated range measured by this experimental method are all within 5%. It demonstrates that the synchronous detecting method has a wide application prospect in high-accurate crack tip strain field and crack development analysis.

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“…It is of great significance to accurately predict the failure mode and strength of CFRP composites with open hole. Feito et al 13 investigated the tensile and fatigue properties of open‐hole carbon fiber composites by using digital image correlation method and infrared thermographic. Results showed that the increase of inter‐laminar temperature can be significantly reduced with the change of fiber orientation in loading direction.…”

Section: Introductionmentioning

confidence: 99%

Progressive damage and tensile failure of open‐hole carbon fiber polymer composites reinforced by carbon nanotubes

Han

Zhou

Ding

2022

J of Applied Polymer Sci

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Progressive damage and tensile failure of open‐hole carbon fiber/carbon nanotube reinforced composites with different off‐axis angles were detected by acoustic emission and Micro‐CT. K‐mean clustering algorithm can be utilized to post‐process signals of acoustic emission. Three critical points including linear growth point, near maximum load point and failure point, were selected to study progressive damage. Results indicated that stiffness variable decreased with the increase of off‐axis angle. When the off‐axis angle was 0°, higher initial stress and catastrophic brittle fracture characteristics can be obtained, whereas pseudo‐ductile behavior can be observed when off‐axis angles were 30° and 45° because of the alignment of yarn (fiber trellising) and the matrix plasticity. Due to the symmetrical structure of plain texture, there was a very interesting phenomenon that the tensile strength of composite specimen with 45° off‐axis angle was 23.65% higher than that of the specimen with an off‐axis angle of 30°. In the second stage of loading, the slope drop sharply when the load reached first key point, and Kaiser Effect can be observed. Acoustic emission technology and Micro‐CT method are beneficial to damage assessment of complex composites.

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An Experimental and Numerical Investigation to Characterize an Aerospace Composite Material with Open-Hole Using Non-Destructive Techniques

Cited by 9 publications

References 72 publications

Residual Properties in Damaged Laminated Composites through Nondestructive Testing: A Review

Residual Properties in Damaged Laminated Composites through Nondestructive Testing: A Review

IRT and DIC Synchronous Detection of Stress Intensity Factors and Plastic Zone Ranges

Progressive damage and tensile failure of open‐hole carbon fiber polymer composites reinforced by carbon nanotubes

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