Effect of trigger geometry on energy absorption in composite profiles

Jiménez, Miguel; Miravete, Antonio; Larrodé, Emilio; Revuelta, D.

doi:10.1016/s0263-8223(99)00081-1

Cited by 111 publications

(64 citation statements)

References 4 publications

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“…Many researchers [5,8,9,[11][12][13] employed edge chamfering of the structures as triggering mechanism. A few studies have been conducted with square tubes and "I" sectional tubes to study the effect of triggering on energy absorption [14,15]. However, the effect of triggering mechanisms on the energy absorption of circular tubes is yet to be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the axial crushing behaviour of pultruded composite tubes

et al. 2010

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This paper presents the experimental investigation on the progressive deformation behaviour of uni-directional pultruded composite tubes subjected to an axial impact load. Pultruded square and circular profiles with glass-polyester and glass-vinylester combinations were used for this study. Two types of triggering profiles were incorporated to investigate the effect of triggering on the energy absorption. All above combinations were investigated for three different impact velocities (9.3, 12.4 and 14m/s). The crushing peak and mean load characteristics of the composite tubes with different triggering profiles and their progressive failure modes are presented. To measure the impact velocity and the impact force, a contactless method using digital image correlation technique was adopted. The effects of the geometry profile, triggering, strain rate and the type of resin on energy absorption of the composite tubes were studied in detail.KEYWORDS: Specific energy absorption; Triggering mechanism; Crushing; Progressive failure; Composite tubes IntroductionA great deal of research and development has been carried out in the past decades to design safer automobiles. Out of the factors considered for safety criteria, the crashworthiness has attracted significant attention due to its multiple functions. The functions of the crashworthiness structures are to (i) absorb energy, (ii) keep the occupant compartments intact and (iii) ensure tolerable deceleration levels for driver and passengers during the crash event. To meet the above functions, the automobile industry is focused on the design architecture and materials used to produce crashworthiness. As a result, different forms of the energy absorbers [1,2] and combinations of high strength metal alloys are used for crashworthiness structures. The focus on new innovative materials which yield superior strength to weight ratio [3] has been increased in order to meet the future stringent crashworthiness norms and to enhance the fuel economy target.On the other hand, there is a considerable amount of experiments [4][5][6][7] conducted on composite material to assess the energy absorption. It is a well-known fact that one can

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Section: Introductionmentioning

confidence: 99%

Experimental study on the axial crushing behaviour of pultruded composite tubes

et al. 2010

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“…The reason for the lower energy absorption is due to higher stress concentrations at the corner edges of the tubes which leads to the formation of the axial cracks only at those locations. Jimenez et al [14] conducted a study on open sections such as "I" sectional composite tubes. The result of this research showed that the energy absorption capability of the "I" sectional profile is 15% smaller than the square cross sectional composite tube; and the corresponding peak crush load during the crushing process was 60% lower.…”

Section: Introductionmentioning

confidence: 99%

“…These initiators are known as "triggering" mechanisms. A few studies [14,22] have been conducted to study the effect of different triggering mechanisms on the energy absorption. However, the 45 ⁰ chamfering around one edge of the composite tube is widely used [5, 8-10, 15, 22] and hence, in this study also the same profile is adopted.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the quasi-static energy absorption of small-scale composite tubes with different geometrical shapes for use in sacrificial cladding structures

et al. 2010

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This paper focuses on the quasi-static crushing characteristics and the corresponding energy absorption of nine different shapes of small-scale composite tubes. The idea is to choose suitable cross sections and geometrical shapes of the composite tubes which can yield progressive deformation and higher energy absorption; the finalized geometrical shapes will be studied further for the inner core of a sacrificial cladding structure against blast loading. All the composite tubes have been manufactured by a hand lay-up technique using E-glass fabric and polyester resin. Quasi-static axial crushing tests have been conducted to understand the deformation patterns and the corresponding load-deformation characteristics of each composite tube. The effect of dimensions (thickness to diameter ratio) on the specific energy absorption of each composite tube was studied. Finally, the quasi-static test parameters such as the peak crush load, mean crush load and the specific energy absorption of all these composite tubes were compared. From this unique study, it was found that the specific energy absorption of special geometrical shapes (hourglass type -A, hourglass type -B, conical circular type -X and conical circular type -Y) of the composite tubes is significantly higher than the standard and uniform profiles such as the square and the hexagonal cross sections.

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“…The mean crush load (P mean ) and the absorbed energy (E d ) were calculated based on Equation 16 and 17.…”

Section: Comparison Of Crush Loads and Energy Absorptionmentioning

confidence: 99%

“…Generally these initiators are called "triggering mechanisms". The importance of these triggering mechanisms and their effects on the energy absorption are studied experimentally in [1,16]. Out of the many triggering mechanisms studied, the 45° edge chamfering was used by many researchers [1,7,8,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Parametric study of crushing parameters and failure patterns of pultruded composite tubes using cohesive elements and seam, Part I: Central delamination and triggering modelling

et al. 2010

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Typically, most of the brittle composite tubes exhibit circumferential delamination, lamina bending, axial cracking and brittle fracturing when subjected to static and dynamic loading conditions. In this work, a new innovative approach was adopted to model the above said failure modes using cohesive elements under an axial impact loading case. The circular and square cross sectional pultruded profiles made of glass-polyester were considered for the study. A numerical parametric study has been conducted to study the effect of the delamination on the failure patterns and the corresponding energy absorption using a single layer and two layers of shell elements. To predict the peak crushing load and the energy absorption, the importance of the adequate numerical modelling of triggering is discussed. All numerical simulations were carried out using the commercially available finite element code ABAQUS V6.7-3 Explicit. Finally, the results of this comprehensive numerical investigation are compared with previously published experimental results [1]. Part II of this paper deals with the influence of multiple delaminations and modelling of axial cracks on the deformation patterns and the effect of initial geometric imperfections on the energy absorption.

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Effect of trigger geometry on energy absorption in composite profiles

Cited by 111 publications

References 4 publications

Experimental study on the axial crushing behaviour of pultruded composite tubes

Experimental study on the axial crushing behaviour of pultruded composite tubes

Comparative study of the quasi-static energy absorption of small-scale composite tubes with different geometrical shapes for use in sacrificial cladding structures

Parametric study of crushing parameters and failure patterns of pultruded composite tubes using cohesive elements and seam, Part I: Central delamination and triggering modelling

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