High Strain Rate Compressive Tests on Wood

Allazadeh, Mohammad Reza; Wosu, Sylvanus N.

doi:10.1111/j.1475-1305.2010.00802.x

Cited by 23 publications

(13 citation statements)

References 11 publications

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“…Generally, the results indicated that increasing strain-rates and decreasing moisture content led to higher material strengths in the radial, tangential, and axial loading directions. Reid and Peng (1997), Zhong et al (2009), and Allazadeh and Wosu (2011) all reported some level of compressive strength enhancement when small-scale specimens were subjected to high strain-rates using a SHPB. Several researchers have also studied the effect of loading rate on the flexural material properties of in-grade members.…”

Section: Introductionmentioning

confidence: 94%

Influence of high strain-rates on the dynamic flexural material properties of spruce–pine–fir wood studs

et al. 2014

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The influence of high strain-rate loading on the flexural response of typical light-frame wood construction has been investigated. A total of 30 stud grade 38 mm × 140 mm × 2440 mm (2== × 6== × 8=) spruce-pine-fir (S-P-F) lumber specimens were tested within a range of low and high strain-rates between 6 × 10 −6 s −1 and 0.4 s −1 . A single-degree-of-freedom iterative solution procedure was used to compute the high strain-rate modulus of rupture (MOR) and modulus of elasticity (MOE). The MOR was statistically enhanced by high strain-rates, while the MOE and strain at rupture were not. Since equilibrium of the dynamic stress-strain relationship requires that one or both of the MOE and strain at rupture must be sensitive to strain-rate effects, the lack of observed rate enhancement on these material properties was attributed to large scatter within a small sample set. Based on the results, material dynamic increase factors and a stress-strain relationship suitable for blast resistant design of timber structures were also proposed.Résumé : L'influence d'un chargement très rapide sur la réponse en flexion d'une construction typique à ossature de bois a été étudiée. Un total de 30 échantillons de catégorie colombage de 38 mm × 140 mm × 2440 mm (2== × 6== × 8=) en épinette -pin -sapin (E-P-S) a été mis à l'épreuve sous diverses vitesses, basses et élevées, situées entre 6 × 10 −6 s −1 à 0,4 s −1 . Le MOR (moment de résistance) et le MOE (module d'élasticité) sous une vitesse de chargement élevée ont été calculés selon une procédure itérative à un seul degré de liberté. Le MOR a été statistiquement accru par les vitesses de chargement élevées alors que le MOE et la contrainte à la rupture ne l'ont pas été. Puisque l'équilibre de la relation tension-contrainte dynamique exige que le MOE et-ou la contrainte à la rupture soient sensibles aux effets de la vitesse de chargement, le manque d'observation d'un accroissement de la vitesse sur ces propriétés de matériaux a été attribué à une grande dispersion dans un petit ensemble d'échantillons. En se basant sur les résultats, des facteurs d'augmentation du rapport résistance dynamique/résistance statique et une relation tension-déformation adéquate pour la conception résistante aux vitesses de chargement rapides pour les structures à ossature de bois sont proposés. [Traduit par la Rédaction] Mots-clés : explosion, vitesse de déformation élevée, facteur d'augmentation du rapport résistance dynamique/résistance statique, module de rupture, module d'élasticité, E-P-S, bois d'oeuvre, bois, montant, tube à chocs.

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Section: Introductionmentioning

confidence: 94%

Influence of high strain-rates on the dynamic flexural material properties of spruce–pine–fir wood studs

et al. 2014

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“…Previous laboratory works proved that depending on the nature of the penetrator head, conical hemispherical penetrator was found to be more effective in penetrating or perforating the composite plate than spherical penetrator [27] . The authors [28][29][30] have analyzed the high-energy penetration/perforation mechanics of steel, aluminum, wood and the woven graphite epoxy composites individually and confirmed that for all of these materials, strain rate, ultimate strain, and energy absorption increase with increasing perforation energy.…”

Section: Introductionmentioning

confidence: 82%

“…Integrating this wave provides the energy absorbed-time history, force-displacement, stress-strain, and other relevant data with which the specimen damage can be characterized. For interested readers the detail of the experimental set up can be found in other published papers of the authors [27][28][29][30][31] . The specimen is placed in a penetrator holder, which is mounted at the end of the incident bar.…”

Section: Experimental Detailmentioning

confidence: 99%

Compression of the Material Characteristics of Steel, Aluminum, Wood and Woven Graphite Epoxy Composites in Response to High Strain Rate Load

Allazadeh¹,

Itani²,

Wosu³

2012

AMSA

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The stresses developed in the material by impact load are analyzed experimentally, numerically, and analytically for specimens out of steel, aluminum, wood and woven graphite epoxy composites to investigate the material response to high strain rate stresses for aforementioned materials. The applied strain rates in experiments were set to be within 950 and 3500 s-1. The thin circular shape specimens were examined with high strain rate laboratory tests using the perforation split Hopkinson pressure bar (P-SHPB) with dimensional ratio accepted for One-dimensional stress analysis hypothesis. The article describes analytical solutions for one dimensional in detail to be implemented for numerical analyzing via trapezoid computation. The graphs of the four listed materials with two different thicknesses are compared for the specimen's energy absorbed, specimen's strain rate, stress strain rate relationship of the specimen, maximum energy absorbed, and maximum strain in specimen. It turned out that the dependency of deformation on energy absorption follows a power law for the woven composite and is approximated with linear relationships for aluminum and steel. Studying the effect of thickness in energy absorbed shows that doubling the thickness of the specimen reduces the strain of the specimen by 50 percentages for woven graphite epoxy and wood specimens, but the reduction is 25 percentages in the steel and aluminum specimens.

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“…40 m s −1 ) compared to bullets. However, the impactors can be large (kg masses) and made of materials such as wood whose dynamic properties are not as well studied or understood as other materials , making the phenomenon harder to model and analyse than classic ballistic impact (Figure ).…”

Section: Damage Mechanismsmentioning

confidence: 99%

An Introduction to the Properties of Silica Glass in Ballistic Applications

Walley

2013

Strain

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The purpose of this review is to introduce the interested reader to the literature on the use of silica glasses in ballistic applications. These applications include optically transparent windows (where their amorphous nature, appropriate band gap, and cheapness make them ideal window materials) as well as layers in opaque armours designed to be resistant to shaped charges. In the latter application, their increase in volume (bulking) on fracture disrupts the shaped charge jet. Other topics covered in this review include low‐velocity damage by windborne debris, liquid and solid impact, dynamic methods of testing (Hopkinson pressure bar, Taylor impact, and plate impact shock loading), and constitutive models. The use of glass as a shaped charge is also discussed.

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High Strain Rate Compressive Tests on Wood

Cited by 23 publications

References 11 publications

Influence of high strain-rates on the dynamic flexural material properties of spruce–pine–fir wood studs

Influence of high strain-rates on the dynamic flexural material properties of spruce–pine–fir wood studs

Compression of the Material Characteristics of Steel, Aluminum, Wood and Woven Graphite Epoxy Composites in Response to High Strain Rate Load

An Introduction to the Properties of Silica Glass in Ballistic Applications

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