Abstract
This paper investigates the uniaxial compressive failure behavior of polymethacrylimide (PMI) foam across a range of temperatures (20 °C–200 °C), at both macro- and microscales. The investigation includes dynamic mechanical analysis and dimensional stability tests to evaluate the material’s heat resistance. The stress–strain curve of PMI foam under varying compressive failure mechanisms was analyzed, utilizing the Liu–Subhash model for accurate prediction of the material’s stress–strain constitutive relationship at different temperatures. The results indicate that between 20 °C and 180 °C, PMI foam behaves as an elastoplastic material, displaying a “three-stage” pattern in its stress–strain curve. At 200 °C, the material transitions to a hyperelastic incompressible state, evidenced by a “two-stage” stress–strain pattern. The paper also determines how temperature affects yield strength and elastic modulus, as well as the influence of strain rate at different temperatures. A quasi-static compression constitutive model for PMI foam, considering temperature effects, was modified from the Liu–Subhash model. These findings offer crucial theoretical support and data for understanding the thermo-mechanical bearing mechanism in composite sandwich structures.
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The authors acknowledge support from the National Natural Science Foundation of China (51479205, 51609252).
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Chen is responsible for fitting theoretical formulas and experimental data, writing the content of Part 5 and compiling the entire manuscript; L is responsible for the second part of experimental testing and data processing, and writes the content of the second part; M is responsible for writing the content of Part 1, analyzing the content of Part 4, and designing the overall framework of the article; L is responsible for the data processing and plotting of the fourth part of the content; B is responsible for the experimental testing, data processing, and analysis of Part 3. All authors have reviewed the manuscript
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Chen, G., Lv, Y., Mei, Z. et al. Characterization and modeling of the uniaxial thermo-mechanical compressive behavior of polymethacrylimide (PMI) foam at different temperatures. Mech Time-Depend Mater (2024). https://doi.org/10.1007/s11043-024-09671-x
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DOI: https://doi.org/10.1007/s11043-024-09671-x