一种基于光谱超声波数据计算聚合物格子结构弹性常数的随机方法
Abdullah Al Masud1, Paul F Egan2, Jingfei Liu2
1Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA; Department of Radiology, Mayo Clinic, Rochester MN 55905, USA.
Ultrasonics
|October 18, 2025
概括
共振超声谱学 (RUS) 准确地测量了聚合物格子中的弹性常数,由于增材制造应用中的不同变形机制,显示了比准静态测试更高的模量.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 增材制造 增材制造 增材制造
背景情况:
- 增材制造的聚合物格子为生物医学和结构用途提供可调节的机械性能.
- 由于制造变化和不同的测试方法,鉴定这些格子的异型弹性反应是复杂的.
研究的目的:
- 将共振超声谱 (RUS) 应用于立体石刻制造的以身体为中心的四角形 (BC-Tetra) 聚合物晶格.
- 用实验和有限元素分析 (FEA) 数据提取和比较弹性常数.
- 调查动态 (RUS) 和准静态机械表征之间的差异.
主要方法:
- 使用共振超声谱 (RUS) 来确定动态弹性特性.
- 与修改的参数调的粒子群优化 (PSO) 用于从自身频率的弹性常量反转.
- 有限元分析 (FEA) 用于基于模型的自身频率预测.
- 进行了近静态压缩试验以进行比较.
主要成果:
- 在轴度 (C33) 和剪切模块 (C44,C66) 方面,RUS和FEA之间发现了强大的一致性.
- 平面内刚度常数 (C11,C12) 和轴联 (C13) 显示出更高的方差,表明反转灵敏度.
- 来自RUS的模块比准静态测量高 (20-32%高),这归因于每个技术探测的变形机制的差异.
结论:
- RUS是一种可行的技术,用于表征聚合物格子的弹性特性,即使是那些损失很高的.
- 动态和准静态测量产生不同的有效模块,因为它们对局部和全球变形的反应不同.
- 该研究推进了使用RUS来表征复杂的格子结构的实践,从而有可能减少操作员的依赖.
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