Structure, Mechanical Performance, and Dimensional Stability of Radiata Pine (<i>Pinus radiata D. Don</i>) Scrimbers

Wei, Jinguang; Rao, Fei; Huang, Yuxiang; Zhang, Yahui; Qi, Yue; Yu, Wenji; Hse, Chung‐Yun

doi:10.1155/2019/5209624

Cited by 13 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kumar A et al [20] investigated the mechanical properties of bamboo scrimber and found that the highest modulus and strength properties, when the density is 1.2 g/cm 3 . Wei et al [21] demonstrated that the increase of density was positively related to the increase of the stiffness and strength of bamboo scrimber. The bending strength with density of 0.8 g/cm 3 was 120 MPa, much larger than wood-based panels [22,23].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo

Sewar¹,

Zhang²,

Meng³

et al. 2022

Journal of Renewable Materials

View full text Add to dashboard Cite

Engineered bamboo has recently received lots of attention of civil engineers and professional researchers due to its better mechanical performance than that of softwood timber. Parallel strand bamboo is one important part of engineered bamboo for its excellent durable performance compared to the laminated veneer bamboo. The required curing temperature in hot-pressing process is usually higher than 120°C to reduce the content of nutritional ingredients and hemy cellulose, and to avoid the decay from the environment and insects. Nonetheless, the appearance of engineered bamboo gets darker with the increase of temperature during the hot-pressing process. In order to minimize the color deepening while maintaining the durability, a high-durable parallel strand bamboo (HPSB) with relative high hot-pressing temperature (140°C) was produced and tested. The present study investigates the mechanical performance through tension, compression, shear and bending tests. The experimental behavior of the specimens was identified, including the failure mode and load-displacement relationship. It was demonstrated that the HPSB material had better mechanical performance parallel to grain, making it as a considerable structural material. The average elastic modulus parallel to grain was 14.1 GPa, and the tensile and compressive strengths were 120.7 MPa and 121.0 MPa, respectively. The tension perpendicular to grain should be avoided in the practical application due to the lower strength and elastic modulus. Two stress-strain relationships of tension and compression parallel to grain, including three-linear and quadratic function models, were proposed and compared with the experimental results. The three-linear model was then applied to the finite element model. The finite element analysis using ANSYS software was conducted to validate the feasibility of the constitutive relationship. The quadratic function model showed better agreement with the experimental results, but the three-linear relationship was also precise enough to analyze the bending tests of HPSB material, whereas being less accurate to describe the elastic-plastic compression behavior.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo

Sewar¹,

Zhang²,

Meng³

et al. 2022

Journal of Renewable Materials

View full text Add to dashboard Cite

show abstract

“…The enhanced performance of WS is closely related to the specific structure of WFB, characterized by a controlled cracking pattern where the longitudinal fibers remain intact, and the transverse fibers are partially connected [13], thereby improving permeability and adhesion. Therefore, the quantitative evaluation and online regulation of the cracking degree (CD), such as the use of machine vision and CT [14,15], could help improve and stabilize the quality of WFB.…”

Section: Introductionmentioning

confidence: 99%

“…Still, the specific surface area cannot be directly and effectively measured in practice. Therefore, previous studies have indirectly characterized the CD by soaking the water absorption of WFB in 5-10 min [12,13,18]. Although this method can classify the CD, the non-online grading judgment process can only be used for sampling checks.…”

Section: Introductionmentioning

confidence: 99%

Image-Based Evaluation of Cracking Degrees on Wood Fiber Bundles: A Machine Learning Approach

Chai,

Liu,

Guo

et al. 2024

Forests

View full text Add to dashboard Cite

In this study, a machine learning-based method to assess and predict the cracking degree (CD) on wood fiber bundles (WFB) was developed, which is crucial for enhancing the quality control and refining the production process of wood scrimber (WS). By roller-cracking poplar wood one to three times, three distinct CD levels were established, and 361 WFB specimens were analyzed, using their water absorption rate (WAR) as the foundation for CD prediction. Through crack image analysis, four key quantitative parameters were identified—cracking density, coherence degree, crack count, and average width—and this study found through discriminant analysis that the discrimination accuracy on the CD levels by cracking density or coherence degree over 90%, emphasizing their significance in evaluation. Cluster analysis grouped the specimens into three clusters based on four key quantitative parameters, aligning with the CD levels. This study developed specialized prediction models for each CD level, integrating principal component analysis for dimensionality reduction with polynomial fitting, achieving mean squared error (MSE) of 0.0132, 0.0498, and 0.0204 for levels 1, 2, and 3, respectively. An integrated model, with an accuracy of 94.3% and predictions within a 20% error margin, was created, demonstrating the effectiveness of using surface crack image features to predict WAR of WFB. This research establishes a methodological framework for assessing CDs on WFB, contributing to enhancing WS product quality and helping to better understand wood cracking and water absorption mechanisms.

show abstract

“…Thus, the bamboo bundles are separated in situ exhibiting loosened horizontally and continuous longitudinally [7]. Notably, earlier efforts showed that the cracks in bamboo bundles create abundant pathway for adhesive penetration, which developed into water resistance and dimensional stability in bamboo scrimber [10][11][12][13]. For example, the findings by Wei and Li reported that thinner bamboo bundles had a significant benefit of 114% water absorption and 142.3% in the distribution of adhesives, which resulted in 20% and 50% increments in water resistance and mechanical properties of bamboo scrimber, respectively [11,12].…”

Section: Introductionmentioning

confidence: 99%

The Separation Mechanism of Bamboo Bundles at Cellular Level

Hao

Tian

Shu-nong

et al. 2022

Forests

View full text Add to dashboard Cite

Bamboo bundles with linear cracks were produced using mechanical treatments that were more environmentally friendly and more efficient than chemical decomposition and steam explosion. This study presented the separation mechanism by analyzing the structure, micro-mechanical properties and chemical constituent of bamboo bundles at the cellular level. The micro X-ray tomography technology (u-CT) morphology of bamboo and bamboo bundles presented that the separation of bamboo bundles was caused by crack propagation, which was related to the structure of the cell types in bamboo. Field emission scanning microscopy (SEM) was performed to observe the appearance of bamboo bundles at the cellular level, which illustrated that the cracks were prone to grow in the middle lamella (ML) in fiber cells and parenchymal cells. The nanoindentation technique and Raman microscopy was used to illustrate that the middle lamella (ML)with low indentation moduli and high lignin content was the weak structure in bamboo. This is interpreted as how the structure and mechanical properties contributed to the separation of the bamboo.

show abstract

Structure, Mechanical Performance, and Dimensional Stability of Radiata Pine (Pinus radiata D. Don) Scrimbers

Cited by 13 publications

References 35 publications

Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo

Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo

Image-Based Evaluation of Cracking Degrees on Wood Fiber Bundles: A Machine Learning Approach

The Separation Mechanism of Bamboo Bundles at Cellular Level

Contact Info

Product

Resources

About