对几何相位变化和侧带峰值计数技术进行比较研究,用于监测损坏增长和材料非线性
Guangdong Zhang1,2, Tribikram Kundu1,2,3,4, Pierre A Deymier1,4
1New Frontiers of Sound Science and Technology Center, University of Arizona, Tucson, AZ 85721, USA.
Sensors (Basel, Switzerland)
|October 26, 2024
概括
这项研究引入了用于检测和监测结构损坏的新声学方法. 几何相变指数 (GPC-I) 检测损伤,而侧带峰值计数指数 (SPC-I) 区分非线性材料行为.
科学领域:
- * 结构性健康监测 (SHM)
- * 非线性超声波技术
- * 材料科学 材料科学
背景情况:
- * 监测损坏增长和物质非线性对于结构完整性至关重要.
- * 非线性超声波技术,如侧带峰值计数 (SPC),是有效的,但有局限性.
- * 拓声学 (TA) 传感为几何相变 (GPC) 参数提供了一个新的方法.
研究的目的:
- * 调查几何相变指数 (GPC-I) 和侧带峰数指数 (SPC-I) 对于损坏检测和材料非线性评估的有效性.
- * 为了比较GPC-I和SPC-I在板结构损伤增长的数值建模中的性能.
- * 探索GPC-I在线性与非线性材料区分方面的潜力,以及SPC-I在区分非线性材料类型方面的潜力.
主要方法:
- *使用有限元法 (FEM) 和非局部周边超声技术进行数值建模.
- *模拟损伤增长 (裂) 和材料非线性 (非线性应力-张力关系).
- *应用和比较基于拓声学 (TA) 和侧带峰值计数 (SPC) 的传感技术 (GPC-I和SPC-I).
主要成果:
- *GPC-I有效地检测线性模型中的损伤,但由于微小的散射差异,难以监测增长.
- *SPC-I需要非线性反应来检测变化;它对于纯线性损伤是无效的.
- *GPC-I和SPC-I都能监测损伤演变,当存在非线性反应和频率优化时.
- *GPC-I区分线性与非线性材料;SPC-I区分不同类型的非线性材料.
结论:
- *GPC-I在损坏检测和识别非线性材料行为方面表现有前途.
- * SPC-I更有效地描述不同类型的材料非线性.
- * 该研究提供了GPC-I和SPC-I机制的洞察力,指导未来的结构性健康监测应用.
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