纺织学报 ›› 2017, Vol. 38 ›› Issue (08): 55-61.doi: 10.13475/j.fzxb.20160900407

• 纺织工程 • 上一篇    下一篇

织物的防刺机制及刀具形状对防刺性能的影响

  

  • 收稿日期:2016-09-05 修回日期:2017-04-20 出版日期:2017-08-15 发布日期:2017-08-10

Stab-resistant mechanism of fabrics and influence of cutter shape on stab resistance

  • Received:2016-09-05 Revised:2017-04-20 Online:2017-08-15 Published:2017-08-10

摘要:

为研究高强织物抵御刀具刺破的机制,从力学角度分析了在刀具穿刺过程中织物的受力变化及刀具的能量转化,并结合超高分子质量聚乙烯纤维防刺材料的静态穿刺与动态穿刺实验,验证了刀具的瞬时冲击力及动能转化的理论分析。计算结果显示:在冲刺动能为24 J、刺入角度为0°条件下,对织物产生的瞬时冲击力可达1 811.85 N,对织物的瞬时压强为7.49×108 Pa,此二者是导致织物受损的主要因素;刀具刺入过程中产生的动能除克服织物的弹性外,还有部分能量因摩擦转化为热能,该热能至少可使织物升温100 ℃,但具体转化率还有待研究;此外,不同刀具形状对织物的破坏机制有所不同,并直接影响破口形态和穿刺深度,相同条件下,双刃刀刺入最深,其次是单刃刀和锥。

关键词: 防刺机制, 防刺性能, 超高分子质量聚乙烯, 穿刺实验, 力学分析, 刀具形状

Abstract:

In order to explore the stab-resistant mechanism of high-strength fabrics, the fabric stressing changes and cutter energy transformation occured in the cutters’  stab  process are analysed from the view of mechanics,the stab experiment results of ultra-high molecule weight polyethylene stab-resistant fabric under the static and the dynamic environment verify the theoretical analysis of instantaneous impact force resulting from the cutting tool and the conversion of kinetic energy. The calculation results demonstrate that the instantancous impulse force of the cutter end to the fabric can reach 1811.85 N and the instantaneous pressure can be  7.49×108 Pa under conditions of the stab kinetic energy of 24 J and the stab angle of 0°; and the two are main factors causing the fabric damage. Some kinetic energy produced in the cutter stab process overcomes the fabric elasticity, and the other kinetic energy transforms into heat energy, which allows the fabric to be heated up to at least 100℃, but the specific conversion requires further study. Different  cutter shapes cause different damage mechanisms to fabrics, and have direct impact on the shape and the stab depth, and under the same conditions, the double-edged cutter has the largest stab depth, followed by single-edged cutters and cones.

Key words: stab-resistance mechanism, stab resistance, ultrahigh molecular mass polyethylene, stab experiment, mechanical nanlysis, cutter shape

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