增韧环氧树脂冲击性能的应变率与温度效应

Strain rate and temperature effects on impact properties of toughened epoxy resins

摘要

为研究应变率、温度及增韧改性对环氧树脂冲击性能的影响，通过分离式霍普金森压杆对纯环氧树脂及增韧环氧树脂进行了−40、0、23 ℃（室温）和 70 ℃的单轴动态压缩实验。结果表明，环氧树脂在增韧前后均表现出显著的应变率效应与温度效应。在室温条件下，增韧可以有效提升环氧树脂的吸能能力，当温度升高至 70 ℃或降低至−40 ℃均会使其韧性明显下降；在−40、0 ℃及 70 ℃下，随应变率提高，增韧环氧树脂的韧性快速劣化，甚至低于纯环氧树脂。研究显示，增韧改性对环氧树脂冲击性能的增强适用于室温；极端高低温环境与高应变率载荷会大幅劣化增韧效果，限制改性环氧树脂在宽温域、动载荷服役场景下的应用。

Abstract

To investigate the effects of strain rate，temperature and toughening modification on the impact properties of epoxy resin，uniaxial dynamic compression tests are performed on neat and toughened epoxy resins at −40，0，23 ℃ (room temperature) and 70 ℃ using a split Hopkinson pressure bar (SHPB). The results show that both the neat and toughened epoxy resins exhibit significant strain-rate and temperature effects. At room temperature，toughening can effectively improve the energy absorption capacity of epoxy resin；however，the toughness decreases obviously when the temperature rises to 70 ℃ or drops to −40 ℃. At −40，0 ℃ and 70 ℃，the toughness of the toughened epoxy resin deteriorates rapidly with increasing strain rate，even falling below that of the neat epoxy resin. Studies indicate that the enhancement of epoxy resin impact performancevia toughening modification is only effective at ambient temperature. Under extreme high/low temperature environments and high-strain-rate loading， the toughening effect degrades drastically，which restricts the application of modified epoxy resins in service conditions featuring wide temperature ranges and dynamic loads.

关键词

环氧树脂 / 应变率 / 冲击性能 / 增韧

Key words

epoxy resin / strain rate / impact property / toughen

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基金资助

稳定支持项目(2019-363)