The high strain rate response of PVC foams and end-grain balsa wood

Tagarielli, V.L.; Deshpande, V.S.; Fleck, N.A.

doi:10.1016/j.compositesb.2007.02.005

Cited by 135 publications

(85 citation statements)

References 17 publications

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“…A visco-plastic formulation is employed for the PVC foam and balsa wood cores, based upon the multi-axial constitutive descriptions of Deshpande and Fleck [19] and Tagarielli et al [18]. The rate sensitivity of the core materials is taken from the independent measurements of Tagarielli et al [20]. Finally, the FE predictions are compared with the observed response, including the maximum admissible blast impulse assuming a tensile failure criterion for the face sheets.…”

Section: Scope Of Studymentioning

confidence: 99%

“…Tagarielli et al [20] found that the compressive plateau stress pl  for the PVC foams scales with the applied strain rate  according to the power law relation…”

Section: Pvc Foam Coresmentioning

confidence: 99%

“…Both quasi-static and dynamic compressive tests were performed by Tagarielli et al [20] on the H100 and H250 PVC foam cores. Results from these tests are used in the present study to calibrate the constitutive models for the PVC foam core.…”

Section: Pvc Foam Coresmentioning

confidence: 99%

“…The static and dynamic material responses of the balsa wood were measured by Tagarielli et al ([18], [20]). Uniaxial compression and single-lap shear tests were performed in the in-plane and transverse directions of the balsa wood sheets and revealed that the balsa wood has a plastically compressible, transversely isotropic response.…”

Section: Balsa Wood Corementioning

confidence: 99%

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Prediction of the dynamic response of composite sandwich beams under shock loading

Tagarielli

Deshpande

Fleck

2010

International Journal of Impact Engineering

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Finite element calculations are reported for the dynamic shock response of fully clamped monolithic and sandwich beams, with elastic face sheets and a compressible elastic-plastic core. Predictions of the peak mid-span deflection and deflected shape of . Good agreement is observed, and the maximum sustainable impulse is also predicted adequately upon assuming a tensile failure criterion for the face sheets. The finite element calculations can also be used to bound the response by considering the extremes of a fully intact core and a fully damaged core.It is concluded that the shock resistance of a composite sandwich beam is maximised by selecting a composite with fibres of high failure strain.

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Section: Scope Of Studymentioning

confidence: 99%

“…Tagarielli et al [20] found that the compressive plateau stress pl  for the PVC foams scales with the applied strain rate  according to the power law relation…”

Section: Pvc Foam Coresmentioning

confidence: 99%

Section: Pvc Foam Coresmentioning

confidence: 99%

Section: Balsa Wood Corementioning

confidence: 99%

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Prediction of the dynamic response of composite sandwich beams under shock loading

Tagarielli

Deshpande

Fleck

2010

International Journal of Impact Engineering

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“…Calladine and English [5] classified columnar structures in two groups: Type I structures are characterized with a flat-topped quasi-static load deflection curve, showing limited or no strength enhancement at increasing deformation velocities and Type II structures are characterized with a strong softening after yielding at quasi-static strain rates and the lateral inertia forces lead to increased bending forces at increasing deformation velocities. The increased deformation forces at increasing strain rates in the compression of aluminum honeycomb structures through out of plane [29], metallic columnar structures [31], aluminum foams [4,29,32], sintered stainless steel hollow spheres [33] and balsa wood in the axial direction [30,34] were reported to result from the micro-inertial effects. The increased peak stresses with increasing impact velocities were also found in periodic cellular metal cores such as Y-frame and corrugated sandwich cores: Y-frame was shown to be less sensitive than corrugated and pyramidal truss cores [8].…”

mentioning

confidence: 99%

The impact responses and the finite element modeling of layered trapezoidal corrugated aluminum core and aluminum sheet interlayer sandwich structures

Kılıçaslan

Güden

Odacı

et al. 2013

Materials & Design (1980-2015)

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a b s t r a c tThe impact responses of brazed and adhesively bonded layered 1050 H14 trapezoidal corrugated aluminum core and aluminum sheet interlayer sandwich panels with 3003 and 1050 H14 aluminum alloy face sheets were investigated in a drop weight tower using spherical, flat and conical end striker tips. The full geometrical models of the tests were implemented using the LS-DYNA. The panels tested with spherical and flat striker tips were not penetrated and experienced slightly higher deformation forces and energy absorptions in 0°/90°corrugated layer orientation than in 0°/0°orientation. However, the panels impacted using a conical striker tip were penetrated/perforated and showed comparably smaller deformation forces and energy absorptions, especially in 0°/90°layer orientation. The simulation and experimental force values were shown to reasonably agree with each other at the large extent of deformation and revealed the progressive fin folding of corrugated core layers and bending of interlayer sheets as the main deformation mechanisms. The experimentally and numerically determined impact velocity sensitivity of the tested panels was attributed to the micro inertial effects which increased the critical buckling loads of fin layers at increasingly high loading rates.

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Degradation of radiation exposed polymethacrylamide (Rohacell^® 31) foam used in composite hardware

Zaldivar

Labatete-Goeppinger

Easton

et al. 2016

J of Applied Polymer Sci

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Rohacell® foam is a critical structural component used to fabricate composite hardware for space applications. The effect of radiation exposure on Rohacell® 31 HFHT has been evaluated to determine the degree of chemical and mechanical degradation that may occur in a space environment. A 60Co source was used for exposure levels ranging from 0 to 8 Mrad. Tensile tests showed significant decreases of 50% in tensile strength and 75% decreases in failure strain, after only a 4‐Mrad exposure. However, the rate of degradation sharply decreased with additional exposure since crosslink density was more affected during the early stages of radiation exposure. Size exclusion chromatography and multiangle light scattering of the extracted material also provided evidence showing an increase in the concentration of lower molecular weight (Mw) fragments after exposure. The average Mw of the extracted material dropped by two orders of magnitude from the control to the 5‐Mrad specimens, however changes in Mw between the 5‐ and 8‐Mrad specimens only varied by 30% similar in trend to mechanical property data. LS analysis showed a structural conformation change from a heavily branched network to a more linear conformation. Dynamic mechanical analysis exhibited increases in the peak height and breadth of the tan δ curve with radiation dose. These increases in damping are a result of chain scission which results in increased segmental motion caused by decreases in the degree of crosslinking within the polymer structure. Gas chromatography–mass spectrometry was used to probe the potential sites of radiation susceptibility within the PMI polymer structure and are discussed. The radiation susceptibility of this polymeric material should be properly evaluated when utilizing this material for space applications since end of life conditions may vary significantly from beginning of life mechanical and thermal behavior. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44670.

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The high strain rate response of PVC foams and end-grain balsa wood

Cited by 135 publications

References 17 publications

Prediction of the dynamic response of composite sandwich beams under shock loading

Prediction of the dynamic response of composite sandwich beams under shock loading

The impact responses and the finite element modeling of layered trapezoidal corrugated aluminum core and aluminum sheet interlayer sandwich structures

Degradation of radiation exposed polymethacrylamide (Rohacell^® 31) foam used in composite hardware

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The high strain rate response of PVC foams and end-grain balsa wood

Cited by 135 publications

References 17 publications

Prediction of the dynamic response of composite sandwich beams under shock loading

Prediction of the dynamic response of composite sandwich beams under shock loading

The impact responses and the finite element modeling of layered trapezoidal corrugated aluminum core and aluminum sheet interlayer sandwich structures

Degradation of radiation exposed polymethacrylamide (Rohacell® 31) foam used in composite hardware

Contact Info

Product

Resources

About

Degradation of radiation exposed polymethacrylamide (Rohacell^® 31) foam used in composite hardware