使用实验和数值方法对具有不同几何形状的PLA+标本进行机械表征
Mete Han Boztepe1, Mehmet Haskul1
1Department of Mechanical Engineering, Şırnak University, Şırnak 73000, Türkiye.
Polymers
|January 28, 2026
概括
在3D打印的PLA+元件中的几何不连续性显著影响机械性能. 有限元分析和拉伸试验揭示了不同的几何结构如何影响强度,刚度和可塑性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 在增材制造的聚合物组件中,几何不连续性是固有的.
- 它们对机械反应的影响往往没有量化.
- 需要进行系统的几何比较研究.
研究的目的:
- 通过实验和数量研究FDM打印的PLA+样本的拉伸行为,具有不同的几何形状.
- 量化几何不连续性对机械响应的影响.
- 为了验证一个预测建模框架.
主要方法:
- 狗骨,圆孔和U的PLA+标本的拉伸测试 (ASTM D638型IV).
- 使用实验校准的拉姆伯格-奥斯古德弹性-塑料模型进行有限元模拟.
- 实验结果与模拟预测的比较.
主要成果:
- 狗骨样本显示了固有的物质反应 (UTS 41-43 MPa,E=3.06 GPa).
- 圆孔样本表现出局部变形,延展性降低 (1.4-1.6%),明显模量增加 (3.17 GPa).
- 标记为U的标本显示了严重的应力度,高明显模量 (≈5.30 GPa) 和脆碎的骨折 (柔性为0.9-1.0%).
- FEA准确地预测了峰值应力 (≈42 MPa) 和材料在几何形状上的行为.
结论:
- 在FDM打印的PLA+中,几何不连续性极大地影响应力局部化,表面刚性和断裂开始.
- 经过验证的拉姆伯格-奥斯古德模型可靠地预测了取决于几何的机械行为.
- 该框架支持增材制造的聚合物结构的几何意识设计.
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