纳米橡胶增强环氧树脂在宽应变速率载荷下的力学行为

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science Pub Date : 2024-02-01 DOI:10.1016/j.nanoms.2023.03.001

Yinggang Miao , Jianping Yin , Wenxuan Du , Lianyang Chen

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引用次数: 0

摘要

含有 0、2、6 和 10 wt% 纳米橡胶的纳米橡胶/环氧树脂复合材料在 8 × 10-4 s-1 至 ∼ 2 × 104 s-1 的宽应变率范围内受到单轴压缩。意想不到的是，它们的应变速率敏感性和应变硬化指数随着纳米橡胶含量的增加而增加。根据使用单胞模型进行的数值模拟，提出了潜在的机理。应变速率敏感性随纳米橡胶含量的增加而增加的原因是，纳米橡胶在高应变时的不可压缩性降低，从而产生了更高的静水压力。当应变超过 0.35 时，环氧树脂在 22,000 s-1 的应变速率下开始出现绝热剪切局部化。环氧树脂中纳米橡胶的存在阻止了绝热剪切局部化的传播，从而减少了绝热剪切局部化。

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Mechanical behavior of nanorubber reinforced epoxy over a wide strain rate loading

Nanorubber/epoxy composites containing 0, 2, 6 and 10 wt% nanorubber are subjected to uniaxial compression over a wide range of strain rate from 8 × 10⁻⁴ s⁻¹ to ∼2 × 10⁴ s⁻¹. Unexpectedly, their strain rate sensitivity and strain hardening index increase with increasing nanorubber content. Potential mechanisms are proposed based on numerical simulations using a unit cell model. An increase in the strain rate sensitivity with increasing nanorubber content results from the fact that the nanorubber becomes less incompressible at high strain, generating a higher hydro-static pressure. Adiabatic shear localization starts to occur in the epoxy under a strain rate of 22,000 s⁻¹ when the strain exceeds 0.35. The presence of nanorubber in the epoxy reduces adiabatic shear localization by preventing it from propagating.

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来源期刊

Nano Materials Science Engineering-Mechanics of Materials

CiteScore

20.90

自引率

3.00%

发文量

294

审稿时长

9 weeks

期刊介绍： Nano Materials Science (NMS) is an international and interdisciplinary, open access, scholarly journal. NMS publishes peer-reviewed original articles and reviews on nanoscale material science and nanometer devices, with topics encompassing preparation and processing; high-throughput characterization; material performance evaluation and application of material characteristics such as the microstructure and properties of one-dimensional, two-dimensional, and three-dimensional nanostructured and nanofunctional materials; design, preparation, and processing techniques; and performance evaluation technology and nanometer device applications.