Development of a specialised finite element for the analysis of composite structures with ply drop-off

Mukherjee, Abhijit; Varughese, Byji

doi:10.1016/s0263-8223(99)00013-6

Cited by 19 publications

(10 citation statements)

References 18 publications

(26 reference statements)

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“…Kemp and Johnson [2] have studied the distribution of interlaminar normal stress and shear stress for the laminate with nD 3. A comparison of the results has been presented elsewhere [3]. The correlation between the two results is very good.…”

Section: Effect Of Dropping Plies At a Single Stationmentioning

confidence: 71%

“…Laminates of various geometrical and lay-up configurations have been used for this purpose. The global-local approach [3] has been used for analyzing the laminates. A thin long laminate has been chosen (Fig.…”

Section: Parametric Studiesmentioning

confidence: 99%

“…The above ply drop-off analysis has already been validated for various ply dropoff configurations. The details of the analysis and its validation are discussed in separate papers [3,6]. We shall use the methodology in analyzing a number of tapered laminates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design guidelines for ply drop-off in laminated composite structures

Mukherjee

Varughese

2001

Composites Part B: Engineering

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Section: Effect Of Dropping Plies At a Single Stationmentioning

confidence: 71%

Section: Parametric Studiesmentioning

confidence: 99%

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Design guidelines for ply drop-off in laminated composite structures

Mukherjee

Varughese

2001

Composites Part B: Engineering

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“…At last, the "covering ply", of side 55 mm, is placed to encapsulate the sensor inside the monitoring patch. As it can be observed, the patch ply drop-off distance is set on 5 mm, making a drop-off slope of 1/30 as recommended in previous studies [23][24][25][26][27]. Once again, it is underlined that the monitoring patch forms an integration package where the sensor is embedded.…”

Section: Fabrication Of Composite Plates With Monitoring Patchmentioning

confidence: 98%

Mechanical Characterization of an Alternative Technique to Embed Sensors in Composite Structures: The Monitoring Patch

et al. 2011

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Sensor embedding is one of the main operations in dealing with composites incore instrumentation. In this work, an alternative encapsulation technique called "monitoring patch" is proposed to achieve correct sensor embedding, to facilitate the industrialised instrumentation procedure and to adapt the sensors according to the geometry and material heterogeneities required of the composite structures. The monitoring patch is mainly developed with the aim to reduce the variability effects produced if the sensor alone is placed. In this initial study, a first patch's configuration is manufactured with CTMI preimpregnate epoxy-woven glass, hosting two kinds of silicon prism sensors. The monitoring patch is then placed in the thick middle plane of an epoxy-carbon M21 T700GC quasiisotropic plate. The plates are instrumented with strain gauges and tested using digital image correlation (DIC). The strain field maps are calculated to analyse the over-strain zones and to infer fracture paths. At the same time, a FEM model is developed to compare the numerical and the experimental observations. The results show that the mechanical strength of the instrumented plates is not significantly affected by the presence of the patch. The failure path of the instrumented plates with monitoring patch is found along the patch perimeter; therefore, the sensors can be recovered without damage even after the failure of the instrumented structure. The feasibility of the monitoring patch is discussed with other embedding techniques. In further studies, the monitoring patch will host a streaming sensor with an aim to carry out in-core strain measurements.

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“…These issues are equally relevant for tidal turbine blade design and in addition, recent studies have recognised that there is a need for a greater understanding of carbon/glass fibre reinforced composite materials degradation in marine environments. Davies and co-workers at the IFREMER research institute in Brest, France, have investigated the effect of long-term cyclic loading of such materials in sea-water, involving a number of composite material manufacturers Boisseau et al, 2013 Trethewey et al (1993), Botting et al (1996), Mukherjee and Varughese (1999) and Vidyashankar and Krishna Murty (2001). Much of this work took place in the 1990's and a comprehensive review of the ply drop studies conducted during this period is provided by He et al (2000).…”

Section: Figure 2: the Structural Design Process For Tidal Turbine Blmentioning

confidence: 99%

Advanced numerical modelling techniques for the structural design of composite tidal turbine blades

Harper

Hallett

2015

Ocean Engineering

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Abstract:Tidal Stream turbine blades must withstand both extreme one-off loads and severe fatigue loads during their 20-25 year required lifetimes in harsh marine environments. This necessitates the use of high-strength fibre reinforced composite materials to provide the required stiffness, strength and fatigue life, as well as resistance to corrosion, whilst minimising the mass of material required for blade construction and allowing its geometric form to provide the required hydrodynamic performance. Although composites provide superior performance to metals, potential failure mechanisms are more complicated and difficult to predict. A dominant failure mechanism is interfacial failure (delamination) between the composite layers (plies). This paper demonstrates how the development of numerical techniques for modelling the growth of interfacial cracks can aid the design process, allowing the effects on crack growth from potential manufacturing defects and the effect of stacking sequence of composite plies to be analysed. This can ultimately lead to reduced design safety margins and a reduction in the mass of material required for blade manufacture, essential for reducing lifecycle costs. Although the examples provided in this article are specific to tidal turbine blades, the analysis techniques are applicable to all composite structures where fatigue delamination is a primary failure concern.

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Development of a specialised finite element for the analysis of composite structures with ply drop-off

Cited by 19 publications

References 18 publications

Design guidelines for ply drop-off in laminated composite structures

Design guidelines for ply drop-off in laminated composite structures

Mechanical Characterization of an Alternative Technique to Embed Sensors in Composite Structures: The Monitoring Patch

Advanced numerical modelling techniques for the structural design of composite tidal turbine blades

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