Thermomechanical characterization of a balsa-wood-veneer structural sandwich core material at elevated temperatures

Vahedi, Niloufar; Wu, Chao; Vassilopoulos, Anastasios P.; Keller, Thomas

doi:10.1016/j.conbuildmat.2019.117037

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…This tendency is attributed to the thermal mechanical properties of natural wood because of the accelerated chain mobility of the polymeric components of the wood cell walls at elevated temperatures. 42,43 The curves of the storage modulus and tanδ of the ESMTW were highly similar to those of the synthesized vitrimers, as shown in Fig. 7f and 7h and Supplementary Fig.…”

Section: Mechanical Propertysupporting

confidence: 65%

An editable shape-memory transparent wood for smart building materials

Wang¹,

Liu²,

Dong³

et al. 2020

Preprint

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Transparent wood (TW) with excellent optical and thermal management performance has been developed recently as a promising energy-efficient building material. Here, an editable shape-memory TW (ESMTW) is developed through in situ polymerization of epoxy vitrimers into a delignified wood scaffold. The ESMTW possesses high strength at low temperature and flexibility at high temperature, while it exhibits excellent shape-manipulation capability under thermal-stimulus. Meanwhile, the ESMTW shows unique light guiding and directional scattering effects. The light illuminance difference observed in our house model with a common glass ceiling is 81 times, whereas it is only 16 times with a ceiling made of the ESMTW. Most importantly, the transmitted light intensity distribution is tunable owing to its shape-management capability. Additionally, the resultant TW possesses great thermal insulation properties, mechanical strength, and high impact absorption ability. The combination of characteristics enables TW to exhibit great promise as an advanced functional and intelligent building material.

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Section: Mechanical Propertysupporting

confidence: 65%

An editable shape-memory transparent wood for smart building materials

Wang¹,

Liu²,

Dong³

et al. 2020

Preprint

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“…The time taken to reach the end of relaxation is called relaxation time. From other studies, it is reported that at higher temperature relaxation time becomes shorter, while at lower temperature it becomes longer but the shape of relaxation does not change with temperature [57]; moreover, the variation of strain level affects the stress relaxation [58]. The literature also reports the sensitivity of this class of material to loading-directionality, and ductile and brittle phenomena [59].…”

Section: The Contextmentioning

confidence: 97%

Extraction, Applications and Characterization of Plant Fibers

Ntenga¹,

Saidjo²,

Wakata³

et al. 2022

Natural Fiber

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During the second half of the twentieth century, industrial and scientific interests in plant fibers (PFs) have resulted in their resounding comeback as engineering materials. This chapter is concerned with the characterization of PF materials. Good knowledge of the properties of these materials is essential for safe design of the related structures. Bast fibers that are collected from the phloem surrounding the stem of certain dicotyledonous plants, for instance, are among the most used, owing to their higher tensile strength. However, for an optimum utilization of PFs, a relevant assessment of their physico-chemical and mechanical properties is very crucial. As it is now well established, PFs’ properties are largely influenced by their hierarchic composite microstructure and their viscoelastic behavior. This book chapter focuses on the presentation of various experimental approaches used to characterize the elastic and viscoelastic behaviors of plant fibers. Consideration of their blending in sheet form and relevant mechanical properties will also be of interest.

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“…By turning the layer orientations, the idea was to decrease the scatter of the mechanical properties and to tailor these properties to specific applications. In particular, the work of Vahedi et al [37] on veneered balsa core showed a decrease in the shear modulus and strength with increasing temperature. In addition, the increase in the moisture content of the reconstituted balsa leads to a decrease in the mechanical properties such as bending or compressive modulus and ultimate stress [38,39].…”

Section: Introductionmentioning

confidence: 96%

“…The use of strain field measurements also highlighted the presence of a heterogeneous strain field in the balsa material due to the natural origin of the material. Recently, some authors have developed a veneered core made of a thin layer of reconstituted balsa [36,37]. By turning the layer orientations, the idea was to decrease the scatter of the mechanical properties and to tailor these properties to specific applications.…”

Section: Introductionmentioning

confidence: 99%