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中文摘要：
为考察不同使用环境和不同材质安全帽的抗冲击性能,采用落锤试验对几种常用安全帽进行落锤冲击实验。通过自制头模和实测头模上的应变信号,对照观察不同能量下的破坏情况得出：安全帽的抗冲击能力主要取决于安全帽的材料和构造,其中帽箍具有不可忽视的防护功能;同一材质的安全帽承受冲击能量是有限的,当冲击能量超过55 J时,安全帽将会失去保护作用;经过2~3 a的使用而老化的安全帽的冲击强度明显下降。
英文摘要：
In order to study the impact performances of different helmets used in different environments,the most commonly used helmets were tested by drop hammer impact system.The strain signals measured from strain gouges glued on self-made head model were compared with the corresponding damage situation of the helmets.The results show that the impact performances of helmets depend mainly on their structure and materials,and the hoop of helmet has a good protective function.For the same brand of helmets,there is a limited value of the impact energy.When energy generated from objects falling to the helmets from a height is larger than the limited energy,the helmet loses their protection function.Meanwhile the impact strength of the aging of the helmet decreases significantly after the use of 2 a to 3 a.
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