An Experimental Study of the Displacement and Strain Fields across Interphases in Thermoplastic Composites

Abstract:

The main purpose of this paper is to develop a set of improved micro-metrology system, which consists of a digital image-measuring device and a microscope with a long focal length, for the study of displacement fields, strain fields in the area across the interphases, and also the effect of temperature on the micro-mechanics properties of interphases in thermoplastic composites. Meanwhile, the precision of the micro-metrology system is assessed by using an extra solution within of the framework of infinitesimal strain in particular, the choice of the size of subset in the correlation technique is discussed when the displacements are not infinitesimal. Experimental results show that, under practical service conditions of thermo-mechanical coupled loads, a significant residual thermal stress mismatch due to the difference in coefficients of thermal expansion between the fiber and the matrix is balanced out.

• Periodical: Key Engineering Materials (Volumes 306-308)
• Pages: 959-964
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.306-308.959
• Online since: March 2006
• Authors: Jin Long Chen, He Min Wang, Yu Wen Qin, Xin Hua Ji
• Keywords: Deformation, Interphase, Micro Metrology, Micro-Mechanics, Residual Stress

References

[1] Chen J.L., Qin Y.W., Ji H.W., and Ji X.H., Novel quantitative non-destructive testing method for composite structures, Optics and Lasers in Engineering, 1998, 30(3-4), 299-304.

DOI: 10.1016/s0143-8166(98)00020-7

[2] Kang Y.L., Experimental analysis for some interfacial mechanics problems, Mechanics and Practice, 1999, 21(3), 200-208.

[3] Trende A., Astrom B.T., and Nilsson G., Modeling of residual stresses in compression moulded glass-mat reinforced thermoplastics, Composites (A), 2000, 31, 1241-1254.

DOI: 10.1016/s1359-835x(00)00078-6

[4] Kinloch A.J., Little M.S.G., and Watts J.F., The role of the interphase in the environmental failure of adhesive joints, Acta Materialia, 2000, 48, 4543-4553.

DOI: 10.1016/s1359-6454(00)00240-8

[5] Song D.Y., Takeda N., and Ogihara S., A method of stress analysis for interfacial property evaluation in thermoplastic composites, Materials Science & Engineering (A), 2000, 278, 242-246.

DOI: 10.1016/s0921-5093(99)00578-x

[6] Baillie C., Emanuelsson J. and Marton F., Building knowledge about the interface, Composites (A), 2001, 32(3-4), 305-312.

DOI: 10.1016/s1359-835x(00)00111-1

[7] Kim J.K., Sham M.L., and Wu J.S., Nanoscale characterization of interphase in silane treated glass fibre composites, Composites (A), 2001, 32(5), 607-618.

DOI: 10.1016/s1359-835x(00)00163-9

[8] Chen J.L., Qin Y.W., Qu R., and Wang Y.Q., Micro-mechanics study for the interphase of composite materials, Proceedings of SPIE-The International Society for Optical Engineering, 2001, 4317, 248-251.

[9] Chen J.L., Qin Y.W., Yu A.B., and Liu B.H., Micro-experimental study for the stress effects on the interphase of composite materials, Optics and Lasers Engineering, 2003, 39(4), 473-479.

DOI: 10.1016/s0143-8166(02)00029-5