Inflated Cone Experiment for High-Throughput Characterization of Time-Dependent Polymer Membranes
| Autor: | Veli Bugra Ozdemir, Kawai Kwok |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Applied Mechanics. 89 |
| ISSN: | 1528-9036 0021-8936 |
| DOI: | 10.1115/1.4054523 |
| Popis: | Long-term behavior of polymer membranes in the nonlinear regime is probed by strain histories under various stress levels. Current characterization methods for polymer membranes impose a uniform stress field and hence require a series of long-duration tests to be conducted, which poses a significant experimental challenge. Here, we present the inflated cone method to generate a continuous spectrum of strain histories under various stresses in a single experiment. By imposing a known stress gradient and utilizing a full-field strain measurement technique, the inflated cone method provides a high-throughput approach for extracting time-dependent data of polymer membranes. The method is suitable for studying nonlinear time-dependent deformations under a biaxial stress state. The stress range and ratio can be easily modulated by cone geometry design. We demonstrate the utility of the method through creep-recovery tests carried out on a polyethylene thin film. The proposed experimental method is highly beneficial for the development of nonlinear viscoelastic and viscoplastic models. |
| Databáze: | OpenAIRE |
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