Abstract

The application of composites in various industries has grown considerably. The relatively high cost of Low-Velocity Impact (LVI) tests and the limitation in data collection due to the short time of this test, on one hand, and previous reports of the conformity of Quasi-Static Indentation (QSI) test results to LVI test results, on the other hand, have convinced researchers to use QSI instead of LVI. The present research investigates the effect of various percentages of nanoclay (because of their cost-effectiveness) on the impact properties of glass-epoxy composite and has used the QSI test to predict the behavior of this nano-composite. For the homogeneous distribution of nanoclay in the resin, a mechanical and an ultrasonic stirrer were used, and the EDAX image of the nano-resin cross-section confirms the success of this process. The QSI test results showed that adding 3% nanoclay to the glass-epoxy composite improves energy absorption by 18%. Moreover, the SEM images indicated that the samples containing 7% nanoclay had deteriorated mechanical properties due to nanoparticle agglomeration. In the end, experimental and numerical LVI tests were performed on the samples containing zero and 3% nanoclay to evaluate the agreement between QSI and LVI test results. The increase in the maximum force and elastic energy and the decrease in the damping ratio and residual deflection all indicate the positive effect of clay nanoparticles on impact-resistance. Numerical results were also very well matched with experimental ones.

摘要

复合材料在各个行业的应用有了长足的发展。一方面，低速冲击 (LVI) 测试的成本相对较高，并且由于该测试的时间短而导致数据收集受到限制，以及之前关于准静态压痕 (QSI) 测试结果与 LVI 一致性的报告另一方面，测试结果说服了研究人员使用 QSI 而不是 LVI。本研究调查了不同百分比的纳米粘土（由于其成本效益）对玻璃-环氧复合材料冲击性能的影响，并使用 QSI 测试来预测这种纳米复合材料的行为。为了使纳米粘土在树脂中均匀分布，使用了机械搅拌器和超声波搅拌器，纳米树脂横截面的 EDAX 图像证实了该过程的成功。QSI 测试结果表明，在玻璃-环氧树脂复合材料中添加 3% 的纳米粘土可提高 18% 的能量吸收。此外，SEM 图像表明，含有 7% 纳米粘土的样品由于纳米颗粒团聚而降低了机械性能。最后，对含有零和 3% 纳米粘土的样品进行了实验和数值 LVI 测试，以评估 QSI 和 LVI 测试结果之间的一致性。最大力和弹性能的增加以及阻尼比和残余挠度的降低都表明粘土纳米粒子对抗冲击性的积极影响。数值结果也与实验结果非常吻合。SEM 图像表明，含有 7% 纳米粘土的样品由于纳米颗粒团聚而降低了机械性能。最后，对含有零和 3% 纳米粘土的样品进行了实验和数值 LVI 测试，以评估 QSI 和 LVI 测试结果之间的一致性。最大力和弹性能的增加以及阻尼比和残余挠度的降低都表明粘土纳米粒子对抗冲击性的积极影响。数值结果也与实验结果非常吻合。SEM 图像表明，含有 7% 纳米粘土的样品由于纳米颗粒团聚而降低了机械性能。最后，对含有零和 3% 纳米粘土的样品进行了实验和数值 LVI 测试，以评估 QSI 和 LVI 测试结果之间的一致性。最大力和弹性能的增加以及阻尼比和残余挠度的降低都表明粘土纳米粒子对抗冲击性的积极影响。数值结果也与实验结果非常吻合。最大力和弹性能的增加以及阻尼比和残余挠度的降低都表明粘土纳米粒子对抗冲击性的积极影响。数值结果也与实验结果非常吻合。最大力和弹性能的增加以及阻尼比和残余挠度的降低都表明粘土纳米粒子对抗冲击性的积极影响。数值结果也与实验结果非常吻合。