消防头盔非贯穿性损伤对抗冲击加速度能力影响分析

Impact analysis of non-penetrating damage of fire helmet against impact acceleration

通过对消防头盔进行的非贯穿性损伤实验,分析头盔的非贯穿性损伤对冲击加速度的防护效果的影响。首先对消防头盔进行损伤性实验,采用钢锥在1,2,3,4 m对消防头盔进行模拟冲击,讨论不同冲击高度对消防头盔的损伤情况,其次对不同损伤情况下的消防头盔对冲击加速度的防护性能进行分析。研究表明,在发生冲击时,头盔受损情况与冲击加速度成正比;头盔的损伤情况分为冲击凹陷损伤以及微裂纹损伤,冲击凹陷损伤的情况多于微裂纹损伤;在同种损伤情况下,损伤情况严重时,冲击加速度碰撞发生时间变慢,冲击加速度变大;冲击凹陷损伤处的抗冲击加速度的能力要弱于发生微裂纹形变损伤处。

This paper analyzes the impact of non-penetrating damage to helmets on the protective effect of impact acceleration through non-penetrating damage experiments conducted on fire helmets. Firstly, damage experiments were conducted on fire helmets with steel cones at the height of 1, 2, 3, 4 m to discuss the damage caused by steel cones at different height. Then the influence on the protection performance of fire helmets against impact acceleration under different damage conditions was analyzed. Studies have shown that in the event of an impact, helmet damage is proportional to the impact acceleration;the damage on the helmet can be divided into impact depression damage and microcracking damage, more of the former than the latter;when the damage type is the same, the more severe the damage, the later the time of the impact acceleration collisions,and the bigger the impact acceleration;the resistance to impact acceleration at the impact depression damage is weaker than at the microcrack deformation damage.