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Combining mechanical and thermal surface fourier transform analysis to follow the dynamic fatigue behavior of polymers

Hirschberg, Valerian; Wilhelm, Manfred; Rodrigue, D.

Abstract:
This work investigates the phenomena of self-heating, also called intrinsic heating, and thermoelastic coupling during non-linear dynamic mechanical fatigue testing via surface temperature measurement coupled with the mechanical behavior of polymers. Static tensile tests and dynamic strain controlled fatigue tests under tension/tension were performed at a frequency of ω$_{1}$/2π = 5 Hz, as well as in the low cycle fatigue regime at ω$_{1}$/2π = 0.2 Hz, on six polymers: high density polyethylene (HDPE), low density polyethylene (LDPE), ultra high molecular weight polyethylene (UHMWPE), polyamide 6 (PA6), and two grades of polypropylene (PP).

In dynamic testing, the surface temperature rises to a plateau value (ΔT) when an equilibrium between the viscous/plastic dissipated energy and heat convection is reached. Power-law correlations were found between the strain amplitude (ε$_{0}$) and ΔT, as well as between ε$_{0}$ and the calculated dissipated energy density (W$_{diss,p}$) obtained from the mechanical stress response, with similar exponents for both correlations. Thermoelastic coupling is firstly investigated in uniaxial tension, revealing a linear relation between the strain rate and the rate of temperature decrease, which is more distinct with decreasing polymer chain mobility. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129528
Veröffentlicht am 10.02.2021
Originalveröffentlichung
DOI: 10.1016/j.polymertesting.2021.107070
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0142-9418, 1873-2348
KITopen-ID: 1000129528
Erschienen in Polymer testing
Verlag Elsevier
Band 96
Seiten Art.-Nr.: 107070
Schlagwörter Mechanical fatigue; Nonlinear stress response; Plasticity; Thermoelastic coupling; Intrinsic heating
Nachgewiesen in Dimensions
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