形变状态下热防护织物的蓄放热双重特性

Study on heat-storage and heat-release of thermal protective fabrics under deformation

为了探究形变状态下热防护织物的防护机制,研发了形变状态下织物蓄放热特性测试仪,在此基础上对拉伸形变状态下6种热防护织物的蓄热防护性能和放热危害性能进行量化研究。结果表明:随着织物拉伸率的增加,织物在热暴露阶段的累计蓄热量降低,而皮肤得热显著提升,织物的热防护性能下降;当双层织物系统发生拉伸形变时,外层织物较其隔热层通常蓄积更多的热量,织物系统累计蓄热量的降低主要源于隔热层蓄热量下降;在冷却阶段,织物释放至皮肤的累计蓄热回放量随着其拉伸率的增加而逐渐降低,织物的蓄热回放效率逐渐增大。织物发生拉伸形变时,其累计蓄热回放量与累计蓄热量呈正比。

In order to explore the protective mechanism of thermal protective fabrics under tensile deformation,a tester to measure the heat-storage and heat-release properties of thermal protective fabrics under deformation was developed.Using this device,the thermal-protective and thermal-hazardous performances,caused by heat-storage and heat-release,of six different thermal protective fabrics under tensile deformation were studied.The results show that with the increase of the tensile extension of the fabric,the accumulated stored energy within the fabric during the heat exposure stage decreases while the skin heat gain significantly increases,leading to the decrease of the thermal protective performance.In addition,when a double layer fabric system was subject to tensile deformation,the outer layer fabric usually stores more thermal energy than the thermal liner and the reduction in the accumulated stored engergy was mostly because the decrease of heat storage in the thermal liner.During the cooling stage,the accumulated heat discharge to the skin gradually decreases and the heat discharge efficiency increases as the tensile strain rate of the fabric increases.When the fabric was under tensile deformation,the amount of accumulated heat discharge is found to be proportional to the accumulated stored energy.