An experimental and numerical investigation into damage mechanisms in tapered laminates under tensile loading

Zhang, Bing; Kawashita, Luiz F.; Jones, Mike I; Lander, James K.

doi:10.1016/j.compositesa.2020.105862

Cited by 31 publications

(20 citation statements)

References 52 publications

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“…S 33 (MPa) [19] S 13 (MPa) [19] n f [23] n g (MPa when the initiation condition presented in Equation ( 4) is first met (point A in Fig. 11) -and show the clear difference in distributions between the different ply termination methods.…”

Section: Properties Of Cohesive Interface Elementsmentioning

confidence: 98%

“…To gain ply-level stress distributions and a more fundamental understanding of how the scarfed ply drops change the stress distributions around the ply drop regions, numerical analyses were conducted based on a method previously demonstrated to accurately capture delamination type failures by multiple authors [18][19][20], which makes use of a custom written mesh generation code using the MATLAB software package.…”

Section: Numerical Analysismentioning

confidence: 99%

“…The properties of the cohesive interface and continuum elements used are shown in Table 3, along with the enhancement factors. The properties chosen are identical to those presented in the literature defining the TTC enhancement law used in this work [20], except for the interface element strength parameters, which were chosen based on more recent studies [19,25]. The value of G IIC chosen is 0.8 N/mm.…”

Section: Tablementioning

confidence: 99%

See 2 more Smart Citations

Delamination suppression in tapered unidirectional laminates with multiple ply drops using a tape scarfing technique

Gordon

Kawashita

et al. 2021

Composites Part A: Applied Science and Manufacturing

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Composite laminate thickness tapering is essential for weight efficient structures. This is achieved by terminating specific plies, but these can in turn act as sites for delamination initiation. One area of importance is the spacing between adjacent ply drops, which can have a significant impact on the delamination stress. In this work, a novel tape scarfing method that applies a tapered profile to dropped ply ends was used on unidirectional tapered laminate specimens with multiple ply drops. The effect of ply drop spacing on the delamination stress of both conventional and scarfed plies in tension was studied experimentally. The results showed that the scarfed ply drop configurations can completely suppress delamination in certain configurations. The scarfed ply drops also retained higher performance with smaller ply drop spacings. This indicates that in using scarfed plies, conventional laminate design rules could be relaxed and the weight of the structure could be further reduced. The underlying failure mechanisms were also investigated using both analytical and numerical methods. A simple stress-based formula for estimating the delamination stress of scarfed plies was introduced and shown to be consistent with both experimental and numerical results, which could be used (and further developed) to make tapered laminate design easier.

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Section: Properties Of Cohesive Interface Elementsmentioning

confidence: 98%

Section: Numerical Analysismentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Delamination suppression in tapered unidirectional laminates with multiple ply drops using a tape scarfing technique

Gordon

Kawashita

et al. 2021

Composites Part A: Applied Science and Manufacturing

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“…More recently, Zhang et al. (2020) developed high-fidelity models capable of accurately predicting both the failure mode and strength of modesty and severely tapered composite subjected to tensile loading.…”

Section: Introductionmentioning

confidence: 99%

The effect of ply drop-off on tensile strength of thermoplastic carbon fiber composite: a numerical and experimental study

Kane

Gomes

Macanhan

et al. 2022

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PurposeIn laminate composite structure design, it is common to deal with the need of varying thickness to reach project requirement or improve performance. This change of thickness can be achieved by terminating or adding plies at different locations over the laminate. Unfortunately, the inherent weakness of this construction is the presence of material and geometric discontinuities at the ply drop region that induce premature interlaminar failure at interfaces between dropped and continuous plies.Design/methodology/approachIn this work, tensile strength tests were performed on tapered laminates with internal ply drop-off using digital image correlation (DIC) technique. The laminate based on a new thermoplastic ELIUM® 150 reinforced by a plain weave carbon fabric was manufactured via VARTM. Stress, strain, displacement and tensile strength were analyzed. A 3D finite element analysis (FEA) and design of experiments (DOEs) were carried out for the analysis of effect of position and angle orientation of dropped plies near the thinner section of the tapered laminate. Tsai Wu's criterion was implemented to predict initiation of first ply failure.FindingsNumerical and experimental results showed that position and angle orientation of ply drop-off near the thinner thickness influence tensile strength of tapered laminate. Tensile static strength increases 12% when drop-off near the midplane is oriented at ±45° instead of 0°. Results showed a trend of improvement in the tensile strength when drop-off is positioned over midplane of the laminate composite. Results obtained through the DOEs were able to adjust the metamodel according to a linear model with great efficiency. They show the significant relevance of the manufacturing variables and the interaction between the factors.Originality/valueThe present work aims to evaluate the effect of ply drop-off on the strength of carbon fiber thermoplastic composite laminates with internal drop-off under tensile load and propose a design guideline about angle orientation and position of dropped plies closer to the thinner section of the laminate.

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“…Although, in some studies of tapered geometries delamination cracks were reported to be the only damage mode [1], a matrix crack is usually formed in the resin pocket prior to delamination cracks propagating from the pocket into the laminate. Development of delamination cracks, being one of the critical damage modes, has attracted more attention both experimentally and numerically (see [2] and references therein), while the initial matrix cracks are usually disregarded.…”

Section: Introductionmentioning

confidence: 99%

Experimental observation and modeling of resin pocket cracking in unidirectional laminates with ply discontinuity

Fikry

Vinogradov

Ogihara

2022

Composites Science and Technology

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An experimental and numerical investigation into damage mechanisms in tapered laminates under tensile loading

Abstract: An experimental and numerical investigation into damage mechanisms in tapered laminatesunder tensile loading

Cited by 31 publications

References 52 publications

Delamination suppression in tapered unidirectional laminates with multiple ply drops using a tape scarfing technique

Delamination suppression in tapered unidirectional laminates with multiple ply drops using a tape scarfing technique

The effect of ply drop-off on tensile strength of thermoplastic carbon fiber composite: a numerical and experimental study

Experimental observation and modeling of resin pocket cracking in unidirectional laminates with ply discontinuity

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