Investigation on the nano-indentation creep behavior of BOPA6 film based on fractional rheological model
Source abstract
Abstract
The nanoindentation creep behavior of biaxially oriented polyamide 6 (BOPA6) films was investigated using the nanoindentation testing technique under different loading rates and peak loads (holding loads) at room temperature. The results show that with an increase in loading rate, the creep platform of BOPA6 films significantly expands, and the indentation depth also increases significantly under the same load, indicating that the softening phenomenon of the film is more pronounced at high loading rates. To further investigate the micro-mechanical mechanism during the creep process, the stress variations were calculated using the indentation-work method, and fitting analyses of the stress-time curves were performed based on the extended exponential equation (Kohlrausch–Williams–Watts, KWW), the activation volume formula, and the fractional Kelvin model, which revealed the evolution patterns of microscopic heterogeneity, rheological units, relaxation time spectrum, and activation energy spectrum during the creep process.Graphical abstract
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Research context
OpenAlex topics: Force Microscopy Techniques and Applications · Ferroelectric and Piezoelectric Materials · Microstructure and mechanical properties
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References (41)
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