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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.65  No.9 (2016)  >  pp.657-664

Journal of the Society of Materials Science, Japan
<<Previous article Vol.65  No.9 (2016)   pp.657 - 664 Next article>>

Evaluation of Internal Stress in Short-Carbon-Fiber Reinforced Plastics by Transmission X-Ray Diffraction

Kenichi SHIMIZU1), Yuki KOIKE2), Daiki YAMADA2), Kazuya OHARADA2), Keisuke TANAKA1), Takahisa SHOBU3)
1) Dept. Mech. Eng., Meijo Univ. 2) Graduate School, Meijo Univ. 3) Quantum Beam Science Directorirate, Japan Atomic Energy Agency

The internal stress in crystalline thermoplastics, polyphenylene sulphide (PPS), reinforced by carbon fibers of 30 mass% was measured by the diffraction method using synchrotron with energy of 12.3 keV. The stress in the matrix was determined by the sin2ψ method with side-inclination optics of transmitted X-ray diffractions. Using skin-layer strips cut parallel, perpendicular and 45° to the molding direction of the injection molded plates, the matrix stress was measured under the uniaxial applied stress. The matrix stresses in the fiber direction, σ1m and perpendicular to the fiber direction, σ2m, and shear stress τ12m were expressed as the functions of the applied (macro) stresses, σ1A , σ2A , τ12A as follows: σ1m = α11σ1A + α12σ2A , σ2m = α21σ1A + α22σ2A , 12m = α55τ12A and the stress-partitioning coefficients, α11, α12, α21, α22, α55, were determined. The coefficients determined by the transmission method are fairly close to the reported values determined by the reflection method. The experimental values were at least qualitatively agreed with the prediction derived based on micromechanics. The quantitative difference between experiment and prediction is mainly due to the neglect of the distribution of fiber orientations in the micromechanics prediction. Tensile residual stresses were measured in the matrix in the transmission method and were larger in the fiber direction than in the parallel direction. These residual stresses were caused by the mismatch of the thermal expansion coefficient between matrix and fibers.




Keyword:
Residual stress, X-ray stress measurement, Short-fiber reinforced plastics, Fiber orientation, Stress-partitioning coefficient, Micromechanics

Received: December 18, 2015
Published online: September 20, 2016

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