Abstract

Investigating the properties of the needle-punched nonwoven geotextile fabrics in order to improve their performance is important, not only from economical aspects, but also for their multipurpose applications. One of these properties is their resistance to puncture, especially in the dynamic state. Experimental study of this behavior requires the use of special equipment, time, cost, etc. which can be also affected by the unpredictable errors. Therefore, in this study, a finite element based model for prediction of the cone drop dynamic puncture behavior of needle-punched nonwoven geotextile fabrics has been proposed. In order to compare the results of the model with the real situation, a number of four samples with different specifications, including basis weight, thickness, needle penetration depth and punch density were prepared and tested according to EN ISO13433:2006 method. The root mean square error of the cone velocity results as well as the diameter of the hole created indicates a significant agreement between the experimental and the model results. Moreover, the obtained results are confirmed by a validation sample. The proposed model can also be used to estimate the velocity change of the cone, the momentary forces exerted by the fabric to the cone, the stress distribution on the geotextile fabric and to forecast how the puncture happens and the created hole expands during the puncture.

摘要

研究针刺非织造土工织物的性能以提高其性能非常重要，不仅从经济方面考虑，而且从其多用途方面来看也是如此。这些特性之一是它们的抗穿刺性，尤其是在动态状态下。这种行为的实验研究需要使用特殊设备、时间、成本等，这些也会受到不可预测的错误的影响。因此，在本研究中，提出了一种基于有限元的针刺非织造土工织物锥落动态穿刺行为预测模型。为了将模型的结果与实际情况进行比较，我们提供了四个不同规格的样品，包括基重、厚度、根据 EN ISO13433:2006 方法制备和测试针刺深度和冲头密度。锥速度结果的均方根误差以及所创建的孔的直径表明实验和模型结果之间存在显着的一致性。此外，获得的结果得到了验证样本的证实。所提出的模型还可用于估计锥体的速度变化、织物对锥体施加的瞬时力、土工织物上的应力分布，并预测穿孔如何发生以及穿孔过程中产生的孔如何扩大。获得的结果由验证样本确认。所提出的模型还可用于估计锥体的速度变化、织物对锥体施加的瞬时力、土工织物上的应力分布，并预测穿孔如何发生以及穿孔过程中产生的孔如何扩大。获得的结果由验证样本确认。所提出的模型还可用于估计锥体的速度变化、织物对锥体施加的瞬时力、土工织物上的应力分布，并预测穿孔如何发生以及穿孔过程中产生的孔如何扩大。