Modelling low velocity impact induced damage in composite laminates

Shi, Yu; Soutis, Constantinos

doi:10.1186/s40759-017-0029-x

Cited by 31 publications

(16 citation statements)

References 62 publications

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“…Out‐of‐plane low velocity blunt impact loading introduces considerable subsurface damage, which is often barely visible near the contact point on the surface, and subsequently leads to damage propagation and significantly affect the strength of damaged components (ie, postimpact residual strength) . A significant amount of research has been conducted over several decades to investigate the impact response of composite laminates using experimental, analytical, and computational approaches . In this regard, enhancing postimpact damage tolerance, which is directly related to fracture toughness, and to achieve a balance between strength and toughness, which are in general mutually exclusive properties, has been a key challenge to materials scientists and engineers.…”

Section: Introductionmentioning

confidence: 99%

Intra‐laminar toughening mechanisms to enhance impact damage tolerance of 2D woven composite laminates via yarn‐level fiber hybridization and fiber architecture

2019

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Advanced composites are widely used in primary and secondary structural applications, for example, aerospace, automotive, marine, and renewable energy sectors. But it is well recognized that the impact resistance and damage tolerance of composite laminates are in general poor, which is a major challenge for optimizing structural designs. In this regard, an experimental study is conducted for enhancing the damage tolerance of 2D woven composite laminates by exploring yarn‐level fiber hybridization. Hybrid yarns are produced by combing high‐strength fibers, that is, S‐glass, and high‐toughness fibers, that is, polypropylene [PP], and using commingling and core‐wrapping processes. Using the hybrid yarns, 2D fabrics, that is, with 5H satin, 2/2 twill, and 2/2 basket architectures, are weaved, and subsequently hybrid S‐glass/PP/epoxy laminates are manufactured via vacuum assisted resin infusion. The low velocity impact response and energy absorption of the hybrid laminates are investigated by drop‐weight impact tests at different energy levels, that is, 15 J, 25 J, 35 J, and 50 J. The damage tolerance is studied by compression‐after‐impact (CAI) tests, measuring the residual compressive strength of the damaged laminates. Furthermore, the failure modes are investigated using scanning electron microscopy for identifying damage mechanisms in the hybrid laminates after the impact and CAI tests. The impact response and damage tolerance of the 5H satin, 2/2 twill, and 2/2 basket fabric laminates are compared with that of noncrimp‐fabric laminates produced with (ie, S‐glass/PP yarns) and without (ie, S‐glass yarns) yarn‐level hybridization. It is shown that yarn‐level hybridization and fiber architecture significantly affect the impact behavior and damage tolerance of the 2D woven S‐glass/PP/epoxy hybrid laminates investigated. The microscopy studies show that intra‐yarn, inter‐yarn, inter‐lamina failure mechanisms can in general be introduced by combining yarn‐level fiber hybridization and fiber architecture for modifying failure and energy dissipation mechanisms under low velocity impact and hence the damage tolerance of composite laminates.

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Section: Introductionmentioning

confidence: 99%

Intra‐laminar toughening mechanisms to enhance impact damage tolerance of 2D woven composite laminates via yarn‐level fiber hybridization and fiber architecture

2019

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“…The failure criteria used in the progressive damage analysis of composite materials should not only consider the effect of cumulative damage on the composite material structural strength but also distinguish between different failure-modes. Among them, Hashin 13 proposed a failure criterion based on stress judgment, which is widely used and built into the damage constitutive model by ABAQUS, a prevalent commercial finite element software. Chang focused on the failure characteristics of composite materials and proposed a failure criterion based on strain judgment, which is the most widely used.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the flexural behavior of CFRP box girders

Ding

Zhang

2019

Advanced Composites Letters

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The advantages of carbon fiber-reinforced plastic (CFRP) box girders include good bending resistance, lightweight and high strength. Therefore, they are widely used in aerospace, rail transit, and other fields. When the CFRP box girder is subjected to bending load, the strength of the initial damage is usually used as the ultimate load. However, after the initial damage of the CFRP box girder, the load will be redistributed and structure still have a higher ultimate load. As the damage accumulates, it eventually leads to complete failure of the structure, which is a progressive damage. It turns out that the composite structure still has bending capacity after the initial damage, but the mechanical response at this stage has not been fully studied. To make full use of the ultimate bearing capacity of the CFRP box girder, this article adopts the theory of progressive damage of a composite material and programs the ABAQUS/Explicit user material subroutine (VUMAT) to analyze CFRP box girder progressive damage. This article also produces CFRP box girder specimens with five typical ply schemes and implements three-point bending tests to verify the bending strength of the CFRP box girder. In addition, this article designs strain measurement and ultrasonic scanning experiments to verify the difference between experiment and simulation. The final result shows that the progressive damage model established in this article is reliable, among the five typical ply schemes, when the 0° ply ratio is 60% and the ±45° ply ratio is 40%, the CFRP box girder has the greatest ultimate load carrying capacity.

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“…The final product must undergo characterization from different points of view: chemical, mechanical, thermal, etc. Composites, at least thermoset matrix-based ones, are vulnerable to impact damage [6,7]. Most crucial is the barely visible impact damage (BVID) [8], which, if it remains undetected, may lead to early unpredicted failure.…”

Section: Introductionmentioning

confidence: 99%

Infrared Thermography for Inline Monitoring of Glass/Epoxy under Impact and Quasi-Static Bending

2018

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Featured Application: The scope of this work is to show the potential of infrared thermography to collect important information to be exploited for the characterization of new composite materials. An infrared imaging device can be included in most mechanical test setups for the in-line monitoring of samples undergoing either impact or quasi-static bending, or else fatigue tests. As an important assertion, the use of infrared thermography allows for fast inspection of relatively large surfaces in a remote way without any alteration of the inspected part and without safety-at-work concerns.Abstract: In this work, glass/epoxy has been chosen as case study as it represents the most-used composite material, being appropriate for a vast variety of applications and a reasonable performance/cost compromise. This material has already been inline impact-monitored with infrared thermography, mostly for feasibility tests. Now, impact tests are repeated by changing some parameters and by inline monitoring simultaneously with two different infrared cameras to share a high frame rate and spatial resolution at the same time. In addition, glass/epoxy is monitored also while it is under quasi-static bending tests. The aim of this paper is to show what it is possible to learn from thermal signatures developing in the same material when it is either impacted or under quasi-static bending.

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Modelling low velocity impact induced damage in composite laminates

Cited by 31 publications

References 62 publications

Intra‐laminar toughening mechanisms to enhance impact damage tolerance of 2D woven composite laminates via yarn‐level fiber hybridization and fiber architecture

Intra‐laminar toughening mechanisms to enhance impact damage tolerance of 2D woven composite laminates via yarn‐level fiber hybridization and fiber architecture

Experimental and numerical investigation of the flexural behavior of CFRP box girders

Infrared Thermography for Inline Monitoring of Glass/Epoxy under Impact and Quasi-Static Bending

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