在无支颗粒添加剂制造业中引力诱导的曲的基于物理的预测建模
1Department of Mechanics, Mathematics and Management (DMMM), Polytechnic University of Bari, Via E. Orabona 4, 70125 Bari, Italy.
Polymers
|November 13, 2025
概括
在颗粒增材制造 (PAM) 中,重力诱导的松限制了无支结构. 这项研究开发了一种基于物理的模型,通过优化工艺参数来预测和最大限度地减少丝的偏移,从而实现先进的3D打印.
科学领域:
- 添加剂制造 添加剂制造 添加剂制造
- 材料科学 材料科学 材料科学
- 计算流体动力学的流体动力学.
背景情况:
- 颗粒增材制造 (PAM) 面临的挑战是无支结构的重力诱导的松.
- 现有的模型缺乏对变现象的预测能力.
研究的目的:
- 开发和验证一个基于物理的数值模型,用于PAM下垂的热流体动态.
- 为优化无支制造,将工艺参数与灯光线的偏移相对应.
主要方法:
- 开发了一个预测有限元素 (FE) 模型,其中包含了温度依赖的非牛顿性质和热传递.
- 通过在桌面规模的 PAM 3D 打印机上使用聚乳酸 (PLA) 进行系统实验来验证模型.
- 研究了喷嘴温度,打印头速度,螺丝速度和风扇冷却的影响.
主要成果:
- 优化的工艺参数减少了桥梁偏移的64.91%.
- 活跃的风扇冷却是减少由于加速固化而导致的松的最有效参数.
- 增加的打印头速度减少了松,而更高的螺丝速度和挤出温度增加了它.
- 该FE模型准确地预测了实验结果,并确定了停止松的临界冷却温度 (PLA的150-160°C).
结论:
- 经过验证的数值模型为理解和减轻PAM下垂提供了坚实的基础.
- 有效调整工艺参数,特别是风扇冷却,可以解锁PAM的高级无支持3D打印功能.
相关概念视频
Deformation of Member under Multiple Loadings
431
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
431
Plastic Deformation in Circular Shafts
433
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
433
Normal Strain under Axial Loading
1.1K
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
1.1K
Bending of Curved Members - Strain Analysis
486
The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member...
The important part of bending analysis for such a member...
486
Residual Stresses in Bending
503
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
503
Deformation of a Beam under Transverse Loading
685
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
The insights from the bending moment diagram extend to...
685


