An Investigation into Dynamic Puncture Resistance of the Polyester Needled Nonwoven Geotextiles using Video Processing Technique

Abstract

In this study, the dynamic puncture behavior of nonwoven needle-punched polyester geotextiles has been studied using video processing technique. Twenty-seven needle-punched geotextile samples were produced by changing areal weight, needle penetration depth and punch density as independent variables. Cone drop test was carried out on the samples. In addition to measuring the hole diameter (HD), the video processing technique with a high frame rate camera was employed to calculate the energy absorbed by geotextile fabric up to puncture point (Ep) and the hole expansion energy (Ee). Multiple linear regression method was used to develop the predicting relationships between independent and reply variables. The models showed that an increase in areal weight results in an increase in Ep, whereas it causes a decrease in Ee and HD. Moreover, increasing punch density and needle penetration depth, leads to less Ep, and more Ee and HD. In addition, it was also found that significant relationships exist for Ep-HD and Ee-HD.

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

“…[87][88][89] In addition, the needle-punched nonwoven textile has become popular due to the diverse mechanical and physical properties that can provide different thickness and densities to meet various requirements. [90,91] The short fibers are opened, carded, and laid into a web structure, and then reinforced by using needle with barbs repeatedly punching to form needle-punched nonwoven textile. The needle-punched PET nonwoven textile has the advantages of excellent abrasion resistance, UV resistance, and thermal stability.…”

“…To solve this problem, researchers employed flexible fibers to construct aerogels to enhance the mechanical properties. [ 90–97 ]…”

“…Mi et al. [ 90 ] fabricated a fluorinated hybrid aerogel consisting of graphene oxide, cellulose nanofibrils, and silica nanoparticles by a one‐pot hydrothermal synthesis method. The flexible cellulose nanofibrils in the composite aerogel can prevent volume shrinkage and offer a very large specific surface area, whereas the GO sheets provide mechanical strength for the aerogel.…”

“…To solve this problem, researchers employed flexible fibers to construct aerogels to enhance the mechanical properties. [90][91][92][93][94][95][96][97] Inorganic nanofibers can be added to the network of the inorganic aerogels to strengthen the structure. Generally, inorganic fibers and particles can be introduced into the aerogel network via a gradual assembling.…”

“…The composite aerogel overcomes the poor mechanical properties and high compressibility of pure graphene. Mi et al [90] fabricated a fluorinated hybrid aerogel consisting of graphene oxide, cellulose nanofibrils, and silica nanoparticles by a one-pot hydrothermal synthesis method. The F I G U R E 7 Introducing fiber into inorganic aerogels: (A) inorganic nanofiber reinforce inorganic aerogel (reprinted with permission [96] ); (B) directional freeze drying method provide oriented structure (reprinted with permission [93] ); (C) organic nanofiber reinforce inorganic aerogel (reprinted with permission [94] ) flexible cellulose nanofibrils in the composite aerogel can prevent volume shrinkage and offer a very large specific surface area, whereas the GO sheets provide mechanical strength for the aerogel.…”