Non-Axial Crushing of E-Glass/Polyester Pultruded Tubes

Czaplicki, Michael; Robertson, Richard E.; Thornton, Peter

doi:10.1177/002199839002401004

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…The effects of off-axis crushing on the energy absorption of composite materials and structures have been investigated by few other researchers [1113]. Czaplicki et al [11] studied the crushing process of E-glass/polyester pultruded tubes under off-axis loading and angled loading. They found that these two loading conditions dissipate energy in different friction mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Off-axis Crashworthiness Characteristic of Woven Glass/Epoxy Composite Box Structures

Ghasemnejad

Hadavinia

2010

Journal of Reinforced Plastics and Composites

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This study investigates the influence of off-axis loading on the fracture mechanism and specific energy absorption (SEA) of glass/epoxy twill/weave composite box structures. In this regard, the off-axis angles of 5°, 10°, 20°, and 30° of loading direction with respect to the composite box axis is studied experimentally under quasi-static crushing process. At the off-axis angle of 5°, the crushing process behavior is similar to that of the axial crushing and fracture mechanisms, such as bundle fracture and interlaminar crack propagation in Mode-II are observed. These are characteristic of brittle fracture crushing mode. For crushing at an off-axis angle of 10°, additional interwall crack propagation at one side of the box is also found. This increases the energy absorbing capability of glass/epoxy composite box at this angle. The sidewall crack is a mixed-mode crack. To characterize this crack, the mixed-mode interlaminar fracture toughness, G I/IIC, is measured using asymmetric double cantilever beam (ADCB) test method. For other angles, the non-symmetrical fracture mechanisms are found at four sides of the composite boxes. The arriving of sustained crushing stage is delayed by increasing the off-axis crushing angle. Owing to this fact, the energy absorbing capability is reduced by increasing the off-axis loading angle. An analytical solution is proposed to predict the mean force of axial crushing in brittle fracture crushing mode. The off-axis crushing process of composite boxes is also simulated by finite element software LS-DYNA and the results are verified with the relevant experimental results.

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Section: Introductionmentioning

confidence: 99%

Off-axis Crashworthiness Characteristic of Woven Glass/Epoxy Composite Box Structures

Ghasemnejad

Hadavinia

2010

Journal of Reinforced Plastics and Composites

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“…It was also concluded that at 10˚ off-axis angle the mean crushing force increases in comparison to mean crushing force of axial crushing and a steady decrease with increase of angle of inclination. Song and Du [134] by a change in two factors of toppling tendency and fracture pattern. They also concluded that 0˚ ply can prevent the circumferential cracks and therefore longitudinal resistance to delay the toppling stage (see Figure 9 and Figure 10).…”

Section: Off-axis Crashworthy Behavior Of Frp Composite Box Structuresmentioning

confidence: 99%

Progressive Crushing of Polymer Matrix Composite Tubular Structures: Review

Rabiee¹,

Ghasemnejad²

2017

OJCM

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The present paper reviews crushing process of fibre-reinforced polymer (FRPs) composites tubular structures. Working with anisotropic material requires consideration of specific parameter definition in order to tailor a well-engineered composite structure. These parameters include geometry design, strain rate sensitivity, material properties, laminate design, interlaminar fracture toughness and off-axis loading conditions which are reviewed in this paper to create a comprehensive data base for researchers, engineers and scientists in the field. Each of these parameters influences the structural integrity and progressive crushing behaviour. In this extensive review each of these parameters is introduced, explained and evaluated. Construction of a well-engineered composite structure and triggering mechanism to strain rate sensitivity and testing conditions followed by failure mechanisms are extensively reviewed. Furthermore, this paper has mainly focused on experimental analysis that has been carried out on different types of FRP composites in the past two decades.

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“…2a: Off-axis impact 14 Fig. 2b: Angled impact 14 make load cell and accelerometer readings difficult to interpret. This is because the cable / guide tube arrangement is intended principally as a safety feature to limit but not eliminate lateral movements and rotations of the drop platform.…”

Section: Dynamic Crush Tests Using Drop Towermentioning

confidence: 99%