Monitoring stress changes in carbon fiber reinforced polymer composites with GHz radiation.
Monitoring stress changes in carbon fiber reinforced polymer composites with GHz radiation.
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DOI：
10.1364/ao.56.006405
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发表时间：
2017-08
期刊：
影响因子：
1.9
通讯作者：
Peter J. Schemmel;A. Moore
中科院分区：
文献类型：
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作者：
Peter J. Schemmel;A. Moore
我们进行了概念验证实验，以证明从碳纤维增强聚合物（CFRP）复合材料的表面的GHz照明的反射功率与材料中的应力线性相关。我们引入应力系数来描述归一化功率随施加应力的变化，类似于应力光学系数，因为该效应归因于包括聚合物基质和碳纤维的有效介质的折射率的变化。两种不同的复合材料的应力系数分别为-0.549 0. 134/GPa和-0.154 0. 024/GPa，在40 MPa和100 MPa的测量范围内均呈线性。这种技术开辟了非破坏性评估的可能性，在CFRP组件的制造质量保证和在服务的航空航天和汽车零件的结构健康监测的应力。
We performed proof of concept experiments to demonstrate that the reflected power of GHz illumination from the surface of carbon fiber reinforced polymer (CFRP) composites is linearly related to the stress in the material. We introduce a stress coefficient to describe the change in normalized power with applied stress, analogous to the stress-optic coefficient, because the effect is attributed to changes in the refractive index of the effective medium comprising the polymer matrix and carbon fibers. Stress coefficients of -0.549±0.134/GPa and -0.154±0.024/GPa were measured for two different composite materials, both linear in the measurement range of 40 MPa and 100 Mpa, respectively. This technique opens up the possibility of non-destructive evaluation of stresses in CFRP components for quality assurance in manufacturing and in structural health monitoring of in-service aerospace and automotive parts.