Experimental and computational study of the damage process in CFRP composite beams under low-velocity impact

Topac, O. Tanay; Gözlüklü, Burak; Gürses, Ercan; Çöker, Demirkan

doi:10.1016/j.compositesa.2016.06.023

Cited by 112 publications

(43 citation statements)

References 44 publications

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“…However, they do not conduct the DIC directly in LVI tests, but in compression after impact (CAI) tests, using specimens which were not fully penetrated during the LVI tests. Topac et al [16] use DIC to evaluate the LVI deformation behavior on composite specimens in a bending impact test setup. Singh et al [17], Yudhanto et al [18] and Namala et al [19] perform DIC measurements on FRP composite LVI specimens in a test setup with an hemispherical indenter.…”

Section: Introductionmentioning

confidence: 99%

Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets

2018

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Within this contribution, the low-velocity impact behavior of sandwich structures was investigated. The sandwich structures consisted of carbon fiber reinforced polymer (CFRP) face sheets in various setups, and different core structures, including an open-cell and a closed-cell aluminum foam. The matrix of the face sheets was foamed polyurethane, which also acts as the adhesive connecting the face sheets to the core. Low-velocity indentation tests were carried out with multiple sandwich configurations. The indentation behavior was further examined by additional quasi-static indentation tests, and in situ indentation tests sequentially recorded by X-ray computed tomography. Both the low velocity indentation tests and the quasi-static tests were supported by digital image correlation measurements of the lower specimen surfaces. The overall indentation behavior was described consistently to sandwich structures with different material combinations in literature. The influence of each sandwich configuration parameter on the indentation behavior was determined and described in detail.

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Section: Introductionmentioning

confidence: 99%

Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets

2018

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“…However, this is often not the case for impact damage in composites. A major concern is the growth of hidden, undetected defects caused by low-velocity impacts and fatigue [4]. Various different failure modes and mixed damage modes may occur [2,5].…”

Section: Introductionmentioning

confidence: 99%

Propagation and scattering of guided waves in composite plates with defects

Murat

Fromme

2022

Int. J. Automot. Mech. Eng.

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Failure in aerospace composites owing to low-velocity impact raises a significant maintenance concern because it can lead to invisible damage. For the aerospace industry, such defects pose a potential danger to the structural integrity of aircraft. This in turn jeopardises passenger safety and incurs high repair costs. Hence, it is important to efficiently monitor composite structures during the service life. In this study, the potential of low-frequency guided ultrasonic waves for health monitoring in laminated composite plates is investigated. This study focuses on the use of the first antisymmetric guided wave mode (A0). The first part of this study is to investigate the propagation of the A0 mode in three different undamaged composite plates experimentally. The dispersive and anisotropic behaviour are in agreement with the results of finite element simulations and semi-analytical analysis. The final part of this study presents the scattering of guided waves at the impact damage using a non-contact laser interferometer. Significant scattering activities were observed and the impact damage size can be estimated to be about 10 × 25 mm. In conclusion, these results demonstrate the potential of guided ultrasonic waves for the inspection of aerospace composite structures.

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“…Different failure mechanisms in composites can manifest under impact including various types of intra-ply and inter-ply damage [1][2][3][4]. In addition, the onset and growth of these failure modes depend on various impact parameters such as the properties of an impactor, impact energies, composite layup, structural configuration or environmental conditions [4,5]. Low velocity impact often induces damage that is less than the Barely Visible Impact Damage (BDIV).…”

Section: Introductionmentioning

confidence: 99%

3D Progressive Failure Modeling of Drop-Weight Impact on Composite Laminates

Chinh¹

2018

Preprint

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Composite laminates are susceptible to out-of-plane impact loads due to the lack of reinforcement in the through-thickness direction. Unlike the localized damage induced by a high velocity impact where the incident energy is dissipated near a contact area, low velocity impact damage involves multiple failure mechanisms such as matrix cracking, fiber breakage, and widespread interface delaminations. Depending on the extent of damage, significant reduction in the load-bearing capability of the structure has been observed. The prediction of composite impact damage resistance by a reliable progressive damage analysis tool is essential to reduce intensive and expensive certification tests at structural level. In this work, an enhanced explicit 3D damage model is implemented via VUMAT in Abaqus to perform a drop-weight impact simulation of a [454/04/-454/904]s Hexply AS4/8552 composite laminate. The impact-induced damage and its extent are captured by a 3D Continuum Damage Model (CDM) coupled with an energy driven failure mechanism. The developed module provides a unified solution process for the impact response prediction followed by the residual strength prediction under compression within an explicit solver. Two examples are selected to demonstrate the capability of the progressive failure analysis under dynamic and static loading: 1) a drop-weight test; and 2) an open-hole tension test. Numerical predictions from the developed VUMAT are compared with the test data and predictions using the open source CompDam code developed by NASA.

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Experimental and computational study of the damage process in CFRP composite beams under low-velocity impact

Cited by 112 publications

References 44 publications

Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets

Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets

Propagation and scattering of guided waves in composite plates with defects

3D Progressive Failure Modeling of Drop-Weight Impact on Composite Laminates

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