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article

Unveiling the mechanisms of Moso bamboo's motor function and internal growth stress

Yu Luan, Yuting Yang, Menghong Jiang, Huanrong Liu, more

Bamboo, a renewable resource with rapid growth and an impressive height‐to‐diameter ratio, faces mechanical instability due to its slender structure. Despite this, bamboo maintains its posture without breaking in its battle against environmental and gravitational forces. But what drives this motor function in bamboo? This study subjected Moso bamboo (Phyllostachys edulis) to gravitational stimulation,...

article

Evaluation of near infrared spectroscopy to non-destructively measure growth strain in trees

Fei Guo, Marlene Cramer, Clemens M. Altaner

Cellulose > 2019 > 26 > 13-14 > 7663-7673

In order to quickly predict growth strain non-destructively in green stems of young eucalypt trees, the effects of mechanical strain on rewetted Eucalyptus regnans as well as green E. quadrangulata and E. nitens samples were examined by NIR spectroscopy. Non-destructive NIR measurements of green wood were conducted with a fibre optic probe in reflection mode. Results showed that, abundant free water...

article

Surface growth stress and wood properties of 8-year-old planted Big-leaf mahogany (Swietenia macrophylla King) from different landrace provenances and trial sites in the Philippines

Dennis M. Gilbero, Willie P. Abasolo, Miyuki Matsuo-Ueda, Hiroyuki Yamamoto

Journal of Wood Science > 2019 > 65 > 1 > 1-12

The scarcity of timber to supply the wood-based industries is one of the prevailing problems worldwide. Tree plantations are the remaining solutions to subdue the shortage of raw materials, at the same time sequester atmospheric CO₂ in its biomass to reduce global warming. Planting Big-leaf mahogany (Swietenia macrophylla King) contributes valuable economic inputs to small tree farmers in the Philippines...

article

Chemo-mechanical coupling effect in the high-temperature oxidation of metal materials: A review

HaiLong Wang, WenShan Yu, ShengPing Shen

Science China Technological Sciences > 2019 > 62 > 8 > 1246-1254

The metal materials are susceptible to be oxidized when they are exposed to the complex and harsh environments, especially at the elevated temperature. The development of corresponding chemo-mechanical coupling theory is indispensable in theoretically and numerically predicting the material properties reduction and failures due to the oxidation. In this paper, we review the historical sketch of the...

article

Effects of growth stress in finite-deformation thermally grown oxide on failure mechanism of thermal barrier coatings

Q. Shen, L. Yang, Y.C. Zhou, Y.G. Wei, more

Mechanics of Materials > 2017 > 114 > C > 228-242

Thermally grown oxide (TGO), besides bringing extra mismatch between layers in thermal barrier coatings (TBCs), induces volumetric expansion and local large deformation in constrained interface, which results in huge growth stress and then causes the spallation of coatings. Therefore, characterization on the dynamic growth of oxide and stress evolution during oxidation is desirable, but still intractable,...

article

Models for predicting TGO growth to rough interface in TBCs

Q. Shen, L. Yang, Y.C. Zhou, Y.G. Wei, more

Surface and Coatings Technology > 2017 > 325 > C > 219-228

Oxidation is often regarded as a key factor to cause the failure of thermal barrier coating system (TBCs), which arouses uneven growth of thermal grown oxide (TGO) layer. During the process of oxidation, the rough interface between TGO and bond coat (BC) influences the large growth of TGO and the stress concentration in TBCs. However, theoretical models to describe the effect are not many previously...

article

Telomere damage and redox status alterations in free-living passerines exposed to metals

Janina Stauffer, Bineet Panda, Tapio Eeva, Miia Rainio, more

Science of The Total Environment > 2017 > 575 > C > 841-848

Telomere length may reflect the expected life span and possibly individual quality. Environmental stressors are known to increase oxidative stress and accelerate telomere attrition: however the interactions between redox status and telomere dynamics are not fully understood. We investigated whether exposure to heavy metal pollution is associated with oxidative stress and telomere damage in two insectivorous...

article

Growth and residual stresses in the bonded compliant seal of planar solid oxide fuel cell: Thickness design of window frame

Wenchun Jiang, Yu-Cai Zhang, W.Y. Zhang, Y. Luo, more

Materials & Design > 2016 > 93 > C > 53-62

Bonded compliant seal (BCS) is a new sealing method for planar solid oxide fuel cell. The BCS design uses a thin foil to bond the cell and window frame, which generates a multilayer structure. However, the high temperature bonding generates large residual stresses that greatly affect the fracture. This paper presents a numerical method and neutron diffraction measurement to study the residual stress,...

article

Influence of site, storage and steaming on Eucalyptus nitens log-end splitting

Mario Vega, Matthew G. Hamilton, David P. Blackburn, Robert L. McGavin, more

Annals of Forest Science > 2016 > 73 > 2 > 257-266

Key message Log-end splitting is one of the single most important defects in veneer logs. We show that log-end splitting in the temperate plantation species Eucalyptus nitens varies across sites and within-tree log position and increases with time in storage. Context Log-end splitting...

article

Finite element modelling of the oxidation kinetics of Zircaloy-4 with a controlled metal-oxide interface and the influence of growth stress

Guillaume Zumpicchiat, Serge Pascal, Marc Tupin, Clotilde Berdin-Méric

Corrosion Science > 2015 > 100 > C > 209-221

Experimentally, zirconium-based alloys oxidation kinetics is sub-parabolic, by contrast with the Wagner theory which predicts a parabolic kinetics.Two finite element models have been developed to simulate this phenomenon: the diffuse interface model and the sharp interface model. Both simulate parabolic oxidation kinetics.The growth stress effects on oxygen diffusion are studied to try to explain...

article

Anodization of sputtered metallic films: The microstructural connection

Tanushree H. Choudhury, Srinivasan Raghavan

Scripta Materialia > 2015 > 105 > Complete > 18-21

A simple microstructural rationale for successful anodization of metallic films into ordered oxide nanostructures has been identified. It applies to three of the most commonly studied systems, Zr, Ti and Al films and can be extended to other such oxides. A dense Zone T or II microstructure, in sputtered films, is the most critical ingredient. While T _substrate >0.3T _melting is the...

article

Growth stresses in old beech poles after thinning: distribution and relation with wood anatomy

Citra Yanto Ciki Purba, Estelle Noyer, Julien Ruelle, Jana Dlouhá, more

Journal of the Indian Academy of Wood Science > 2015 > 12 > 1 > 37-43

In the present study, we investigated the reaction of small diameter but old beech poles to canopy opening with particular interest in occurrence of growth stresses which allows the tree to maintain or correct its spatial position. We studied the relationships between growth stresses and (i) thinning treatment and (ii) anatomical structure. Forty-two beech poles were used for the study, half of which...

article

Role of two Nomuraea rileyi transmembrane sensors Sho1p and Sln1p in adaptation to stress due to changing culture conditions during microsclerotia development

Zhangyong Song, Ling Shen, Youping Yin, Wenyong Tan, more

World Journal of Microbiology and Biotechnology > 2015 > 31 > 3 > 477-485

Microsclerotia (MS) formation was successfully induced in Nomuraea rileyi in liquid amended medium (AM) culture. To investigate how N. rileyi senses growth stress and regulates MS differentiation, based on transcriptome library, sho1 and sln1 genes were cloned. The transcription levels of sho1 and sln1 were upregulated...

article

Linking environmental stress, feeding-shifts and the ‘island syndrome’: a nutritional challenge hypothesis

Guillermo Blanco, Paola Laiolo, Juan A. Fargallo

Population Ecology > 2014 > 56 > 1 > 203-216

Adaptation to insular environments often arises from changes and innovations in feeding behaviour allowing expanded foraging habits and an increased niche breadth. These shifts and innovations have traditionally been thought to be related to community-wide processes, but could also be the direct result of environmental constraints determining the abundance, availability and suitability of a particular...

article

Longitudinal growth strains in five clones of Eucalyptus tereticornis Sm.

Pankaj Aggarwal, Shakti Chauhan

Journal of Forestry Research > 2013 > 24 > 2 > 339-343

We studied the variability in longitudinal growth strains and wood basic density in five-year old trees from five clones (one tree per clone) of Eucalyptus tereticornis. Mean longitudinal growth strain in clones ranged from 466 to 876 μm. There was a significant difference between clones in growth strains and wood basic density. Clone 10 exhibited maximum growth strains and basic density, whereas...

article

Relationship between tree morphology and growth stress in mature European beech stands

Delphine Jullien, Robert Widmann, Caroline Loup, Bernard Thibaut

Annals of Forest Science > 2013 > 70 > 2 > 133-142

Aims In European Beech (Fagus sylvatica L.) large growth stresses lead to severe log end splitting that devaluate beech timber. Our study aimed at detecting relationships between growth stress and some morphology parameters in trees. Methods Growth stress indicators were recorded for 440 mature trees in nine stands from five European countries, together with morphology parameters. Results...

article

Growth stress evolution in HfO2/SiO2 multilayers

Jingping Li, Ming Fang, Hongbo He, Jianda Shao, more

Thin Solid Films > 2012 > 526 > Complete > 70-73

Growth stress in hafnium oxide/silicon dioxide (HfO ₂ /SiO ₂ ) multilayers was measured in situ to understand the role of the sublayers and the influence of the underlayers' structural features. Experiments using three- and six-layer films were performed by electron-beam evaporation. During deposition, the developing trend of the force per unit width was controlled by changing the...

article

Continuously missing outer rings in woody plants at their distributional margins

M. Wilmking, M. Hallinger, R. Van Bogaert, T. Kyncl, more

Dendrochronologia > 2012 > 30 > 3 > 213-222

Woody plants growing in seasonal climates normally form one growth ring each year. However, under severe stress conditions they may not complete annual wood production all the way down to the root collar resulting in continuously missing outer rings at lower stem sections (CMORs). Here we test whether CMORs occur at different distributional margins of woody plant species, where stress levels are expected...

article

Analysis on high-temperature oxidation and growth stress of iron-based alloy using phase field method

Fan Yang, Bin Liu, Dai-ning Fang

Applied Mathematics and Mechanics > 2011 > 32 > 6 > 757-764

High-temperature oxidation is an important property to evaluate thermal protection materials. However, since oxidation is a complex process involving microstructure evolution, its quantitative analysis has always been a challenge. In this work, a phase field method (PFM) based on the thermodynamics theory is developed to simulate the oxidation behavior and oxidation induced growth stress. It involves...

article

On the Oxidation and Nitridation of Chromium at 1300 °C

Laurent Royer, Xavier Ledoux, Stéphane Mathieu, Pierre Steinmetz

Oxidation of Metals > 2010 > 74 > 1-2 > 79-92

Chromium can be a candidate of interest as a base component for refractory alloys for high temperature applications. Few data are available about oxidation kinetic of chromium in air for temperature as high as 1300 °C. Moreover, rare papers take the nitridation of chromium into account in the description of the oxidation process or in the calculation of the kinetic constants. In the present study,...

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Search results

Unveiling the mechanisms of Moso bamboo's motor function and internal growth stress

Evaluation of near infrared spectroscopy to non-destructively measure growth strain in trees

Surface growth stress and wood properties of 8-year-old planted Big-leaf mahogany (Swietenia macrophylla King) from different landrace provenances and trial sites in the Philippines

Chemo-mechanical coupling effect in the high-temperature oxidation of metal materials: A review

Effects of growth stress in finite-deformation thermally grown oxide on failure mechanism of thermal barrier coatings

Models for predicting TGO growth to rough interface in TBCs

Telomere damage and redox status alterations in free-living passerines exposed to metals

Growth and residual stresses in the bonded compliant seal of planar solid oxide fuel cell: Thickness design of window frame

Influence of site, storage and steaming on Eucalyptus nitens log-end splitting

Finite element modelling of the oxidation kinetics of Zircaloy-4 with a controlled metal-oxide interface and the influence of growth stress

Anodization of sputtered metallic films: The microstructural connection

Growth stresses in old beech poles after thinning: distribution and relation with wood anatomy

Role of two Nomuraea rileyi transmembrane sensors Sho1p and Sln1p in adaptation to stress due to changing culture conditions during microsclerotia development

Linking environmental stress, feeding-shifts and the ‘island syndrome’: a nutritional challenge hypothesis

Longitudinal growth strains in five clones of Eucalyptus tereticornis Sm.

Relationship between tree morphology and growth stress in mature European beech stands

Growth stress evolution in HfO2/SiO2 multilayers

Continuously missing outer rings in woody plants at their distributional margins

Analysis on high-temperature oxidation and growth stress of iron-based alloy using phase field method

On the Oxidation and Nitridation of Chromium at 1300 °C

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