Effects of high-intensity microwave (HIMW) treatment on mechanical properties and bending failure mechanisms of radiata pine (Pinus radiata D. Don)

IF 3.1 2区农林科学 Q1 FORESTRY

Wood Science and Technology Pub Date : 2024-09-27 DOI:10.1007/s00226-024-01601-x

Xuefeng Xing, Shanming Li, Juwan Jin, Zhenyu Wang, Feng Fu

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Abstract

This study investigated the effects of high-intensity microwave (HIMW) treatment on the mechanical properties of radiata pine wood. The treatment, conducted on sapwood and heartwood with 60% initial moisture content, involved varied microwave energy densities: 60, 80, and 100 kWh/m³. Tests evaluated tensile and compressive properties in three directions, alongside shear strength and bending properties. Acoustic emission (AE) and digital image correlation (DIC) techniques probed damage evolution under bending loads before and after HIMW treatment. As microwave energy density increased, compressive, tensile, and shear strength decreased, with heartwood being the most susceptible. Substantial reductions occurred in longitudinal compressive properties and tensile properties perpendicular to the grain. After HIMW treatment (80 kWh/m³ and 100 kWh/m³ for sapwood and heartwood, respectively), although there was a slight decrease in the modulus of elasticity and bending strength, there was a significant increase in bending plasticity. HIMW-treated specimens exhibited more high-frequency AE signals during elastic–plastic deformation, indicating more frequent fractures in the treated wood during three-point bending. Changes in the microscopic structure of the wood specimens caused by HIMW treatment increased the damage growth rate and stress redistribution efficiency during loading, augmenting the bending plasticity of wood.

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高强度微波（HIMW）处理对辐射松（Pinus radiata D. Don）机械性能和弯曲破坏机理的影响

这项研究调查了高强度微波（HIMW）处理对辐射松木材机械性能的影响。处理对象是边材和心材，初始含水率为 60%，微波能量密度各不相同：60、80 和 100 kWh/m3：60、80 和 100 kWh/m3。测试评估了三个方向的拉伸和压缩特性，以及剪切强度和弯曲特性。声发射（AE）和数字图像相关（DIC）技术探测了 HIMW 处理前后弯曲负载下的损伤演变。随着微波能量密度的增加，压缩强度、拉伸强度和剪切强度都有所下降，心材最容易受到影响。垂直于纹理的纵向抗压性能和抗拉性能也大幅降低。经过 HIMW 处理（边材和心材分别为 80 kWh/m3 和 100 kWh/m3）后，虽然弹性模量和弯曲强度略有下降，但弯曲塑性却显著增加。经过 HIMW 处理的试样在弹塑性变形过程中表现出更多的高频 AE 信号，表明经过处理的木材在三点弯曲过程中更频繁地发生断裂。HIMW 处理导致木材试样的微观结构发生变化，从而提高了加载过程中的损伤增长速度和应力再分布效率，增强了木材的弯曲塑性。

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来源期刊

Wood Science and Technology 工程技术-材料科学：纸与木材

CiteScore

5.90

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.