相关实验视频
Updated: Jun 23, 2025

08:08
Fabrication and Design of Wood-Based High-Performance Composites
Published on: November 9, 2019
13.3K
嵌板木组件中的水分含量的预测分布模型
Panpan Tian1, Jianhong Han2, Shangjie Guo1
1School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, China.
Polymers
|June 19, 2024
概括
这项研究开发了一种木材湿度场模型,以预测木结构中的水分含量随时间和空间的变化. 该模型准确预测水分分布,这对于防止收缩裂等缺陷至关重要.
科学领域:
- 木材科学和材料工程木材科学和材料工程
- 热量和质量转移现象.
- 木材的结构完整性 木材的结构完整性
背景情况:
- 收缩裂是由于水分含量不均和环境变化而导致的木结构常见缺陷.
- 准确预测木材水分含量对于结构耐用性和性能至关重要.
- 现有的模型可能无法完全捕捉木材组件中湿度的动态时间和空间变化.
研究的目的:
- 建立木材含水量的预测模型,考虑时间和空间分布.
- 在各种条件下分析层层木材的吸水和脱水行为.
- 用实验数据和有限元素分析验证拟议的湿度场模型.
主要方法:
- 开发了基于热量和湿度转移类比的层状木材的湿度场模型.
- 在受控条件下收集了对水分吸收和脱吸的实验数据.
- 采用有限元分析来建模和验证水分含量预测.
主要成果:
- 拟议的木材湿度场模型准确地预测了时间和空间湿度含量分布.
- 湿度吸收到95%的平衡需要2.43至6.32天,这取决于最初的湿度范围.
- 内部木材组件超过10天才能达到平衡;水分含量因组件大小和位置而有很大变化.
结论:
- 已建立的湿度场模型有效地预测了木材水分含量随时间和空间的变化.
- 建议在预测模型中使用1-2个顺序来解决特征方程.
- 湿度梯度和木材大小显著影响平均木材水分含量和平衡率.
相关概念视频
Seasoning of Wood
93
Seasoning of wood is a crucial process aimed at reducing and stabilizing the moisture content within the wood to prevent future shrinkage, structural damage, or aesthetic issues once the wood is used in construction. Wood naturally swells when it absorbs moisture and contracts as it dries.
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...
93
Wood Products
81
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
81
Softwoods and Hardwoods
157
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
157
Lumber Defects
110
Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
110
Introduction to Wood
213
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the...
The structural integrity of the...
213
Wood Panel Products
71
Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
71

