Clamping Force Effects on the Performance of Mechanically Attached Piezoelectric Transducers for Impedance-Based NDE
Clamping Force Effects on the Performance of Mechanically Attached Piezoelectric Transducers for Impedance-Based NDE
复制标题
夹紧力对基于阻抗的无损检测的机械连接压电换能器性能的影响
DOI：
10.1007/978-3-030-12676-6_33
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Tenney, C.
中科院分区：
文献类型：
--
作者：
Tenney, C.
基于阻抗的无损评估 (NDE) 是结构健康监测 (SHM) 的推广，通过比较已知健康的参考结构和潜在缺陷的结构来识别损坏。基于阻抗的无损检测考虑的量是与被测部件粘合的压电元件的电阻抗，它通过机电耦合与被测部件的动态振动响应相关联。在这项工作中，压电元件不是直接粘合到被测部件上，而是粘合到 C 形夹具上，然后将其机械连接到被测部件上。在这种附着条件下，针对不同损伤严重程度的机加工钢块，研究了夹紧力对基于阻抗的评估灵敏度的影响。测试的最高夹紧力（600 磅，2670 N）是唯一表现出随着被测零件损坏严重程度的增加而增加的损坏指标值的条件，这表明较高的夹紧力会增加对损坏的敏感度。
Impedance-based non-destructive evaluation (NDE) constitutes a generalization of structural health monitoring (SHM), where comparisons between known-healthy reference structures and potentially-defective structures are used to identify damage. The quantity considered by impedance-based NDE is the electrical impedance of a piezoelectric element bonded to the part under test, which is linked to the dynamic vibrational response of the part under test through electromechanical coupling. In this work, the piezoelectric element is not bonded directly to the part under test, but rather to a c-shaped clamp, which is then mechanically attached to the part under test. Under this attachment condition, the effect of clamping force on the sensitivity of the impedance-based evaluation is investigated for machined steel blocks with varying levels of damage severity. The highest clamping force tested (600 lb, 2670 N) was the only condition exhibiting increasing damage metric values with increasing damage severity in the parts under test, suggesting that higher clamping force increases sensitivity to damage.
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DOI：
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期刊：
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DOI：
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