| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7825540 | Polymer Testing | 2018 | 9 Pages |
Abstract
An ultrasonic guided wave-based method for cure monitoring and estimation of anisotropic viscoelastic properties of carbon fiber reinforced plastics is developed. A guided wave propagating in the transverse direction of a unidirectional carbon fiber reinforced plastic in vacuum bag molding is measured, and its energy velocity and attenuation are obtained after gelation. The transfer matrix method and micromechanical modeling are used to calculate the energy velocity and attenuation in a stratified plate as a function of the complex modulus of the resin. The development of the complex modulus during cure is estimated by comparison of the experimental data with the numerical analysis, and the storage modulus and loss modulus are expressed as functions of the degree of cure using differential scanning calorimetry. The method developed in this study enables non-invasive in-process measurements of the cure state and viscoelastic properties of the carbon fiber reinforced plastic during the cure cycle.
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Authors
Koichi Mizukami, Shingo Yoshimoto, Keiji Ogi,