The mechanical response of Hysol 4183 under constant strain rate loading and creep
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The mechanical response of Hysol 4183 under constant strain rate loading and creep Mechanics of time-dependent materials Nofar Stivi1 · Arieh Sidess2 · Daniel Rittel1
Received: 1 October 2018 / Accepted: 19 July 2019 © Springer Nature B.V. 2019
Abstract A comprehensive mechanical characterization of a polymer named Hysol 4183 subjected to either constant nominal strain rate loading or creep was carried out. The constant nominal strain rate tests included uniaxial loading in compression and tension, and (confined) triaxial loading by using the sleeve method. The creep tests included compressive uniaxial creep and creep-recovery loading at different stress levels and triaxial (confined) creep using the sleeve method. All the experiments were conducted at constant room temperature. A strong dependency of the polymer’s mechanical properties upon the loading rate was observed. Likewise, differences were observed in the tension and compression regime. The confining pressure improves the mechanical resistance of the polymer in terms of strength, failure strain, and elastic modulus relative to uniaxial constant strain rate loading. Curve fitting is applied to the results to model both the constant strain rate, including the influence of the confining pressure, and uniaxial creep loading tests. The creep equations incorporate the elastic, viscoelastic, and viscoplastic strain components. The results predicted by the models are satisfactorily correlated with the measured experimental results. Keywords Strain rate loading · Creep and recovery · Viscoelastic strain · Viscoplastic strain · Epoxy (Hysol 4183) · Confining pressure
B N. Stivi
[email protected] A. Sidess [email protected] D. Rittel [email protected]
1
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Technion, 32000 Haifa, Israel
2
Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Technion, 32000 Haifa, Israel
Mech Time-Depend Mater
1 Introduction Polymers are increasingly used in both civil and military applications, e.g., for electrical systems, pipes, isolation, coatings, and many more. Unlike metals whose thermo-mechanical behavior is well known, the available information about the mechanical behavior of polymers is relatively limited, and basic constitutive models are still rare. The reason for this is the complex viscoelastic–plastic nature of those materials, as related to many factors such as loading conditions (compression, tension, bending, etc.), loading rate and duration, cycles’ number, temperature, and combination thereof. Yet, such models are much needed in order to perform reliability simulations for the mechanical response of polymeric structures, thereby reducing costs of traditional “trial and error” experiments. Polymer behavior can be viscoelastic, viscoplastic, or a combination of both. Therefore, their properties should be determined by time-dependent experiments. The common tests for the mechanical characterization of polymers are: constant nominal stra
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