珠子几何和层时间对大格式聚合物复合材料微观结构和热力学性能的影响
Tyler M Corum1, Johnna C O'Connell1, Samuel Pankratz1
1Mechanical and Aerospace Engineering Department, University of Tennessee, Knoxville, TN 37996, USA.
Polymers
|January 10, 2026
概括
研究了碳纤维增强ABS的大型增材制造 (LFAM). 像珠子宽度和层时间这样的打印参数显著影响热力学性能和层间强度.
科学领域:
- 材料科学 材料科学 材料科学
- 制造业 工程 制造工程
- 聚合物科学 聚合物科学
背景情况:
- 大尺寸增材制造 (LFAM) 能够通过层次的材料挤出来创建大型复杂的结构.
- 使用Loci-One系统,使用各种打印参数打印了碳纤维增强的烯乙烯 styrene (CF-ABS).
- 了解参数-结构-属性关系对于优化LFAM流程至关重要.
研究的目的:
- 调查珠子宽度和层时间对LFAM打印CF-ABS的热力学性能的影响.
- 描述LFAM零件复杂的微观结构及其对材料性能的影响.
- 为了更好地理解打印参数,结果微观结构和最终属性之间的关系.
主要方法:
- 使用材料特征技术来测量热膨胀系数 (CTE) 和层间强度.
- 使用显微镜观察微观结构,包括纤维方向和珠边的"稀释效应".
- 开发了一种传热模型,以确定沉积珠子相对于玻璃过渡温度的冷却时间.
主要成果:
- 显微镜检测显示,在增加珠子宽度的珠子边缘有纤维稀释效应,在更高的剪切速率下,这种效应会减少.
- CTE的结果表明,中体结构显著影响热力学反应,随机定向的核心纤维有时在更高的剪切速率和更大的珠子宽度下占主导地位.
- 当印刷层的时间超过了低于玻璃过渡温度的冷却时间时,层间强度急剧下降.
结论:
- 打印参数,特别是珠子宽度和层时间,极大地影响了LFAM打印的CF-ABS中的热力学性能和层间粘附.
- 纤维方向,珠子几何形状和冷却动态之间的相互作用决定了材料的性能.
- 优化打印参数对于实现所需的热力学性能和确保大型增材制造中的结构完整性至关重要.
更多相关视频
09:41Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes
Published on: May 17, 2018
14.0K
09:54Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process
Published on: June 30, 2023
3.0K
相关概念视频
02:54Trends in Lattice Energy: Ion Size and Charge
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
02:37Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:18Network Covalent Solids
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
01:11Bending of Members Made of Several Materials
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
01:19Crystal Density
The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
01:27Lattice Energies of Ionic Crystals
Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...