Effect of multi stitched locations on high speed crushing of composite tubular structures

Rabiee, Ali; Ghasemnejad, H.

doi:10.1016/j.compositesb.2016.06.068

Cited by 14 publications

(10 citation statements)

References 12 publications

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“…This study is in continuation of previous work of the authors [29], which experimentally investigated the relationship of stitching location and SEA capability of glass/epoxy composite tubes. In this research, multi-stitching is achieved by insertion of a needle, penetrating the specimen with Kevlar yarns at specific locations of 10-15-20-25-30-35 mm from the top end of the specimen with 6 mm spacing (see Figure 1).…”

Section: Experimental Studiessupporting

confidence: 59%

Improvement of Specific Energy Absorption of Composite Tubular Absorbers using Various Stitching Pattern Designs

Rabiee

Ghasemnejad

2020

Appl Compos Mater

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In this paper, various patterns of multi-stitched locations were studied experimentally and numerically to improve the specific energy absorption (SEA) in composite tubular absorbers.In this regard, stitching patterns with a horizontal distance of 3 mm, 6 mm, 9 mm and 18 mm in straight and zig-zag designs were investigated to justify their effect on mean crushing force and energy absorption capability. A multi-shell configuration finite element model is also developed based on energy-based contact definitions, which considers the delamination in Mode-I and stitching pattern design to accurately predict the energy absorption capability and axial crushing behaviour of composite crash absorbers, At stitched locations, the critical normal surface separation was utilised concerning experimental data to improve delamination resistance. The multi-stitching rows of 10-15-20-25-30-35 mm with 3 mm horizontal and 2.5 mm vertical distances between each stitched point can increase the specific energy absorption up to 32% in comparison with non-stitched specimens. The developed numerical model for multi-layered composites absorbers in comparison with the existing methods is efficient in terms of accuracy with less than 5% error in comparison with experimental data.

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Section: Experimental Studiessupporting

confidence: 59%

Improvement of Specific Energy Absorption of Composite Tubular Absorbers using Various Stitching Pattern Designs

Rabiee

Ghasemnejad

2020

Appl Compos Mater

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“…The authors concluded that at 10˚ off-axis loading the mean crushing force exceeds axial loading by 12%. This conflict with another study that the author [25] concluded that as the inclination angle increased the crashworthy behaviour of composite tubes were decreased significantly. The author also noted that this might have been due to geometry difference compared with previous studies.…”

Section: Introductionmentioning

confidence: 58%

Laminate Tailoring of Composite Tubular Structures to Improve Crashworthiness Design at Off-Axis Loading

Rabiee¹,

Ghasemnejad²

2018

OJCM

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This paper presents experimental and numerical investigation on the parameters effecting energy absorption capability of composite tubular structures at oblique loading to improve crashworthiness performance. Various inclined angles of 5˚, 10˚, 20˚ and 30˚ were selected for the study of off-axis loading. The results indicate that by increasing the lateral inclination angle the mean crushing force and also energy absorption capability of all tested sections decreased. From design perspective, it is necessary to investigate the parameters effecting this phenomenon. The off-axis loading effect that causes significant reduction in energy absorption was investigated and the effected parameters were improved to increase energy absorption capability. To establish this study, 10˚ off-axis loading was chosen to illustrate the obtained improvement in energy absorption capability. Five cases were studied with combinations of ply-orientation and flat trimming with 45˚ chamfer. This method was applied to the integrated 10˚ off-axis loading and the final results showed significant improvement in energy absorption capability of composite absorbers. Finite element model (FEM) was developed to simulate the crushing process of axial and off-axis composite section in LS-DYNA and the results were in good agreement with the experimental data.

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“…The significant increase in interlaminar fracture toughness and energy absorption capabilities in the thin-walled structures was obtained from utilising stitching through the thickness. More recently, Rabiee and Ghasemnejad [20] investigated the influence of single and multi-stitching through the thickness which led to pattern stitching on energy absorption capabilities of GFRP cylindrical shells under 2 mm/sec quasi-static loading. The authors showed that the stitched locations and stitching pattern significantly influence the behaviour of progressive crushing.…”

Section: Various Methods Have Been Introduced To Increase Energy Absomentioning

confidence: 99%

“…In previous studies pre-preg GFRP was used to carry out an extensive research on the location of stitching and energy absorption. Based on the authors' previous experimental investigation on the influence of single, multi and pattern stitching using GFRP composite section under quasistatic loading [20], it was shown that stitching pattern of 10-15-20-25-30-35 mm (see Figure 1) from top of the crash absorbers can significantly improve the specific energy absorption capability with 15% increase using Kevlar fibre yarn.…”

Section: Experimental Methods 21 Materials and Specimensmentioning

confidence: 99%

Lightweight design to improve crushing behaviour of multi-stitched composite tubular structures under impact loading

Rabiee

Ghasemnejad

2019

Thin-Walled Structures

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This paper presents experimental and numerical studies on the effect of multi-stitching pattern on the energy absorption capability of composite tubular structures under impact loading. A new multi-stitching pattern was developed to study the increase of specific energy absorption capabilities in GFRP and CFRP crash absorbers. The stitching pattern on both specimens showed a significant increase in energy absorption capability under impact loading. According to our results, the specific energy absorption of GFRP and CFRP composite tubes are 17% and 18% higher than non-stitched specimens respectively. A multi-shell finite element model was constructed to predict the axial crushing behaviour and energy absorption capability of composite structures under impact loading. The method is based on an energy-based contact card modelling technique in the stitched and non-stitched area, and the initiation of main central crack growth occurs when the critical separation (PARAM function) is attained, and this represents the functionality of the stitched area during an impact event. The developed numerical approach is efficient in terms of accuracy and simplicity in comparison with the existing methods for multi-layered composites structures.

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Effect of multi stitched locations on high speed crushing of composite tubular structures

Cited by 14 publications

References 12 publications

Improvement of Specific Energy Absorption of Composite Tubular Absorbers using Various Stitching Pattern Designs

Improvement of Specific Energy Absorption of Composite Tubular Absorbers using Various Stitching Pattern Designs

Laminate Tailoring of Composite Tubular Structures to Improve Crashworthiness Design at Off-Axis Loading

Lightweight design to improve crushing behaviour of multi-stitched composite tubular structures under impact loading

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