Research On Puncture Resistance Of High-performance Fiber/polyester Composite Yarn Fabrics

Due to the threats of natural disasters and instable factors in society,people must choose a variety of products to protect their own safety.Because there is strict control of guns in our country,the hurts from various knives become one of the most serious threat to people's safety in daily life.The traditional stab-resistant armor,however,is very hard and heavy,and is not suitable for daily wear.In addition,the soft stab-resistant fabrics on the market at present are expensive as the universal protection for common public.There are still certain restrictions on popularization and application.Therefore,it is of great significance to comprehensively evaluate the stab-resistant effect,wearable comfortability and cost in preparation of stab-resistant fabrics.In this dissertation,polyester fiber,ultra-high molecular weight polyethylene fiber(UHMWPE),and Kevlar fiber were selected as the fiber materials of stab-resistant fabrics and the mechanical properties and microscopic morphology of the abovementioned fibers under a certain application environments were firstly investigated.And then,the polyester fiber was combined with UHMWPE fiber and Kevlar fiber with different composite yarn forming methods,and the performance of composite yarn was explored.Principal component analysis and stepwise regression were used to establish the mathematical relationship between each parameter and the properties of the composite yarn for predicting the strength and yarn evenness of the composite yarns.Further,the self-made composite yarns were used to prepare stab-resistant woven fabrics,and the quasi-static stab-resistant effect and wearability were measured.The influence of composite yarns,fabric structure and different specifications of knives on the comprehensive properties of the fabric was analyzed.Finally,Solid Works and Abaqus finite element software were used to simulate the puncture process and mechanical behavior of the prepared fabrics.The experimental results show that the mechanical properties of the three fiber raw materials are not significantly damaged in an acid-base environment.UHMWPE fiber has poor heat resistance stability,and high temperature treatment will result in a significant decrease in fiber mechanical properties.As the twist increases,the strength of the composite yarn increases firstly and then decreases.Furthermore,the concept of wrapping angle is introduced,and with six fiber properties of high performance fiber strength,polyester fiber strength,high performance fiber fineness,polyester fiber fineness,high performance fiber wrapping angle and polyester fiber wrapping angle as variables,a yarn evaluation models for exploring yarn strength and yarn evenness are built.Based on the yarn formation expermients and evaluation models,the UHMWPE/polyester composite yarn with 200 twists/m and the Kevlar/polyester composite yarn with 250 twists/m are more suitable for the weaving of stab-resistant fabrics.Through the analysis on the quasi-static puncture load and wearability of the fabric,it is found that the addition of polyester fiber has no obvious effect on the breathability and moisture permeability of the fabric.When the high performance fiber content is constant,the addition of polyester fiber can improve the stab-resistance effect of the fabric,and as the total number of fibers in the fabric increases,the puncture load value increases.When the total number of fibers in the fabric is a constant,the puncture load value of the fabric is increased with high performance fiber content.Stacking multiple layers can greatly improve the stab-resistant effect of the fabric,and compared with a single layer fabric,the quasi static stab-resistant load of stacked four-layer fabric can be increased by up to 536%.The thickness of the knives have a significant impact on the puncture effect.The utility knife with the thinnest body can completely penetrate the fabric,and the knife with a thicker body can not completely penetrate the fabric.The addition of polyester fiber can reduce the cost of the fabric by up to 9%,while the puncture load value of the fabric increases by 16.60%.The finite element model clearly characterizes the mechanical behavior of the knife penetrating the fabric,indicating that the weaker polyester fiber breaks first and is pulled out from the fabric,consuming part of the penetration force,leading to improvement of the stab-resistant effect.