Impact of cyclic compressive loading and moisture content on the mechanical behavior of <i>Aucoumea Klaineana Pierre</i>

Nziengui, Claude Feldman Pambou; Ikogou, Samuel; Pitti, Rostand Moutou

doi:10.1080/17480272.2017.1307281

Cited by 14 publications

(13 citation statements)

References 10 publications

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“…We also observe on these curves (Figure 4) that after the first loading cycle, the strain does not return to its initial position after the unloading path. This highlights the existence of the residual permanent strain that appeared in the first loading cycle, despite the low intensity of the force used (Pambou Nziengui et al 2017). However, the residual permanent strain observed during the first loading cycle remains constant in the following cycles.…”

Section: Cyclic Compression Loadingmentioning

confidence: 77%

Comparative studies of three tropical wood species under compressive cyclic loading and moisture content changes

Edzang

Nziengui

Ango³

et al. 2020

Wood Material Science & Engineering

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The objective of the present study is to perform an experimental comparative cyclic compressive loading test on three tropical species (Aucoumea Klaineana Pierre, Milicia Excelsa and Pterocarpus Soyauxii), at different internal moisture content stages. 150 samples of these three species, dimensioned according to standard NF EN 408 were tested. The specimens were loaded into the static compressive test until they collapsed in order to obtain the mechanical characteristics of each species in terms of: (i) the modulus of elasticity, (ii) the maximal strength and (iii) the stress at the yield point. The specimens are submitted five times to loading-unloading-reloading in cyclic compressive at different internal moisture contents. The applied force was taken at 10% of the maximum rupture force of Okoume species and kept constant at each cycle. The results show a stiffening of the three types of specimens with the loading cycles. The stiffening is faster from the densest species to the least dense species, respectively. In addition, the phenomenon of densification, that occurs during the five loading-unloading cycles, is done with constancy of compressive strength in the three species studied.

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Section: Cyclic Compression Loadingmentioning

confidence: 77%

Comparative studies of three tropical wood species under compressive cyclic loading and moisture content changes

Edzang

Nziengui

Ango³

et al. 2020

Wood Material Science & Engineering

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“…A material will be well known and therefore well valued if its different plasticity and damage mechanisms are well described. This problem is the subject of several studies carried out all over the world on the material wood [1][2][3][4][5][6][7][8][9][10]. The purpose of this study is to study the stress-strain relationship of some tropical species when they are stressed beyond their elasticity limits by cyclic compressive stresses.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Stress-Strain Relationship of Wood Material Beyond Its Elasticity Limit under Cyclic Compressive Loading: Comparative Study of Two Models

Fothe¹,

Azeufack²,

Kenmeugné³

et al. 2021

MMEP

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In this work, we study the relative capacities of two mathematical models for the description of the stress-strain relationship of wood material subjected to damaging cyclic compressive stresses. The models studied are the Mazars-Pijeaudier Cabot model and the Fozao-Foudjet model (Fozao-Foudjet 2). The envelope curves obtained experimentally during the cyclic compression tests were approximated using the two mathematical models and the coefficient determination R 2 was calculated for each of the models. It appears from the observations that the two models present a good fit to the experimental results. In addition, the Fozao-Foudjet 2 model used with the parameters and chosen such as 0.00≤λ0≤0.015 and 0.99≤λ1≤1.05, shows a better fit to the experimental results compared to the Mazar-Pijeaudier Cabot model.

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“…This significantly contributes to the regulation of the climate change [5,6,7]. In addition, the recent decision of the Gabonese government to stop the exportation of tropical species has opened the way to their local expansion, and a more systematic use in local individual and industrial buildings [8,9,10]. However, the mechanical behavior of these species, and more specifically their failure properties, remains poorly studied in the literature, which hampers the reliable design of such structures.…”

Section: Introductionmentioning

confidence: 99%

“…The radial growth and characterization of juvenile and adult wood in plantations is investigated more specifically in [6]. Recently, the hydro-mechanical behavior of Aucoumea Klaineana Pierre under drying process [16] and under cyclic compressive loading has been studied for different internal moisture contents [17,10]. Hovewer, the fracture mechanics aspects are not discussed for the three species studied here.…”

Section: Introductionmentioning

confidence: 99%

Mode I fracture of tropical woods using grid method

Odounga

Pitti

Toussaint

et al. 2018

Theoretical and Applied Fracture Mechanics

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The cracking properties in opening mode of three tropicals species from the Gabonese forest, namely Iroko (Milicia Excelsa), Okume (Aucoumea klaineana Pierre), and Padouk (Pterocarpus soyauxii), were investigated in this study. Various tests were performed at room temperature and for two different thicknesses. A full-field measurement technique, namely the grid method, was used in order to obtain the displacement and strain maps near the crack during the tests. The mechanical parameters, the specificities of the wood species, the Arcan system and the grid transfer method are first described. For all the specimens, the initial crack length was oriented along the fiber direction (RL). The instantaneous failure tests were performed using two types of specimens: the modified Compact Tension Shear (CTS) and the Mixed Mode Crack Growth (MMCG) specimens. The images of the grid were recorded and analyzed to obtain the displacement maps. The crack opening, the location of the crack tip as well as the strain fields on the surface of the specimens were deduced from these displacement maps. The experimental critical energy release rate Gc was evaluated by the compliance method in imposed displacement. In the case of instantaneous crack with CTS specimens, the comparison of the initial value of Gc for all the samples show that this quantity strongly depends on the thickness and density of the species under study. Crack propagation was observed for a thickness equal to 20 mm only. The results of the crack propagation with the MMCG specimens show the same dependence, and confirm the quasi-brittle fracture behavior of Iroko. The experimental results are scattered, but clear trends can be observed concerning the fracture parameters of the in previous studies described in the literature on wood species with wood species under study. The results are finally compared with those given densities similar to those studied here.

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Impact of cyclic compressive loading and moisture content on the mechanical behavior of Aucoumea Klaineana Pierre

Abstract: International audienc

Cited by 14 publications

References 10 publications

Comparative studies of three tropical wood species under compressive cyclic loading and moisture content changes

Comparative studies of three tropical wood species under compressive cyclic loading and moisture content changes

Modeling of the Stress-Strain Relationship of Wood Material Beyond Its Elasticity Limit under Cyclic Compressive Loading: Comparative Study of Two Models

Mode I fracture of tropical woods using grid method

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