使用FDM3D打印技术制造的有的PLA的疲劳寿命评估
Mahsima Seifollahi1, Mohammad Zaman Kabir1
1Department of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran.
Polymers
|January 10, 2026
概括
这项研究调查了构造方向和几何不连续性如何在疲劳下影响3D打印的聚乳酸 (PLA). 最佳的印刷和设计选择通过最小化缺陷和控制应力度,显著提高静态和疲劳性能.
科学领域:
- 增材制造 增材制造 增材制造
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 沉积建模 (FDM) 广泛用于聚合物零件,但其在疲劳下的性能,尤其是几何不连续性,尚未得到充分研究.
- 聚乳酸 (PLA) 是一种常见的FDM材料,但其疲劳行为需要进一步研究制造变量和设计特征.
研究的目的:
- 分析构造方向和几何不连续性对3D打印PLA的静态和疲劳性能的综合影响.
- 在各种负载条件下调查FDM打印的PLA的损伤演变和故障机制.
主要方法:
- 使用"边缘"和"平面"方向的FDM打印样本,具有不同的填充图案.
- 准静态拉力测试和轴疲劳测试 (0.05负载比) 在光滑的,边缘的和中央孔的标本上进行.
- 数字图像相关性 (DIC) 和断层分析被用来研究损伤的启动,进展和故障模式.
主要成果:
- 与"平坦"定向相比",边缘"构造定向由于减少了微空隙和改善了层粘合,使得拉伸强度提高了19%.
- 中心孔引起更明显的应力度和较短的疲劳寿命比边缘口,与静态负载结果一致.
- 微空隙和内部缺陷充当疲劳裂发起点,与几何不连续性相互作用,降低整体疲劳性能.
结论:
- 建筑方向和几何不连续性显著影响3D打印PLA的静态和疲劳特性.
- 尽量减少内部缺陷,并仔细考虑几何不连续性类型,对于提高FDM打印元件的疲劳寿命至关重要.
- 通过DIC等技术了解损坏演变对于预测和提高循环负荷下增材制造零件的可靠性至关重要.
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