Inferring the degradation of pultruded composites from dynamic nonlinear resonance measurements

The Chemical resistance of pultruded polyester composites to various chemical immersion solutions is investigated as a function of the exposure time, and the observations from static tests are compared with the results from nonlinear dynamic vibration experiments. The mechanical properties were measured according to ASTM standards, both in flexural and tensile tests. Barcol hardness and sorption measurements provide complemntary information. In addition, a novel nondestructive (NDE) method, called Single Mode Nonlinear Resonance Acoustic Spectroscopy (SIMONRAS), was applied to measure the linear and nonlinear dynamical properties of the samples as a funtion of exposure time. This new NDE method focuses on the strain amplitude dependence of the resonance frequency while driving a sample at relatively low excitation levels. The obtained relative frequency shift is a measure of the internal microstructural properties of the material. The correlation between this nonlinearity parameter and the mechanical properties is extremely good, which implies that the SIMONRAS technique can be applied to predict the chemo-mechanical degradation of composites in a nondestructive manner.

[1]  Carol L. Schutte,et al.  Environmental durability of glass-fiber composites , 1994 .

[2]  E. E. Ungar,et al.  Loss Factors of Viscoelastic Systems in Terms of Energy Concepts , 1962 .

[3]  K. E.-A. Van Den Abeele,et al.  Nonlinear Elastic Wave Spectroscopy (NEWS) Techniques to Discern Material Damage, Part I: Nonlinear Wave Modulation Spectroscopy (NWMS) , 2000 .

[4]  K. V. D. Abeele,et al.  Damage assessment in reinforced concrete using spectral and temporal nonlinear vibration techniques , 2000 .

[5]  Peter B. Nagy,et al.  Fatigue damage assessment by nonlinear ultrasonic materials characterization , 1998 .

[6]  Otto Buck,et al.  Acoustic harmonic generation due to fatigue damage in high‐strength aluminum , 1979 .

[7]  R. Spontak,et al.  Degradation kinetics of glass-reinforced polyesters in chemical environments , 1996, Journal of Materials Science.

[8]  Paul A. Johnson,et al.  Resonance and elastic nonlinear phenomena in rock , 1996 .

[9]  McCall,et al.  Hysteresis, Discrete Memory, and Nonlinear Wave Propagation in Rock: A New Paradigm. , 1995, Physical review letters.

[10]  M. Lewis Glasses and glass-ceramics , 1989 .

[11]  Paul A. Johnson,et al.  Nonlinear Mesoscopic Elasticity: Evidence for a New Class of Materials , 1999 .

[12]  Alexander Sutin,et al.  Vibro-Acoustic Modulation Nondestructive Evaluation Technique , 1998, Smart Structures.

[13]  William T. Yost,et al.  Acoustic harmonic generation from fatigue-induced dislocation dipoles , 1994 .

[14]  Andrzej K. Bledzki,et al.  Corrosion phenomena in glass fibers and glass fiber reinforced thermosetting resins , 1985 .

[15]  M. L. Hair,et al.  Surface Chemistry and Corrosion of Glass , 1976 .

[16]  P. Johnson,et al.  Nonlinear Elastic Wave Spectroscopy (NEWS) Techniques to Discern Material Damage, Part II: Single-Mode Nonlinear Resonance Acoustic Spectroscopy , 2000 .

[17]  Veniamin E. Nazarov,et al.  Nonlinear acoustics of micro-inhomogeneous media , 1988 .

[18]  Alexander Sutin,et al.  Vibro-Acoustic Modulation Nondestructive Evaluation Technique , 1998 .

[19]  H. Mark,et al.  Encyclopedia of polymer science and engineering , 1985 .

[20]  Robert A. Guyer,et al.  Equation of state and wave propagation in hysteretic nonlinear elastic materials , 1994 .

[21]  Robert A. Guyer,et al.  A new theoretical paradigm to describe hysteresis, discrete memory and nonlinear elastic wave propagation in rock , 1996 .

[22]  J. Richardson,et al.  Harmonic generation at an unbonded interface—I. Planar interface between semi-infinite elastic media , 1979 .

[23]  R. Spontak,et al.  Degradation kinetics of glass-reinforced polyesters in chemical environments , 1996, Journal of Materials Science.

[24]  P. Kiekens,et al.  Effects of Chemical Environments on Pultruded E-Glass Reinforced Polyesters , 2001 .

[25]  C. Snowden,et al.  Pt and Zn based ohmic contacts to p-type InP , 1994, Proceedings of 1994 IEEE 6th International Conference on Indium Phosphide and Related Materials (IPRM).

[26]  Paul A. Johnson,et al.  On the quasi-analytic treatment of hysteretic nonlinear response in elastic wave propagation , 1997 .

[27]  Khaled Aouadi,et al.  Effects of environmental exposure on fiber-reinforced plastic (FRP) materials used in construction , 1997 .

[28]  Lawrence C. Bank,et al.  Accelerated Test Methods to Determine the Long-Term Behavior of FRP Composite Structures: Environmental Effects , 1995 .