In recent years there has been a push for greater job safety in all industries. Personnel protective equipment (PPE) has been developed to help mitigate the risk of injury to humans that might be exposed to hazardous situations. The human head is the most critical location for impact to occur on a work site. A hard enough impact to the head can cause serious injury or death. That is why industries have adopted the use of an industrial hard hat or helmet. The objective of this safety device is to reduce the risk of injury to the head. There has only been a few articles published that are focused on the risk of head injury when wearing an industrial helmet. A lack of understanding is left on the effectiveness of construction helmets when reducing injury. The scope of this paper is to determine the threshold at which a human will sustain injury when wearing a helmet. Complex finite element, or FE, models were developed to study the impact on construction helmets. The FE model consists of two parts the helmet and the human model. The human model consists of a brain, enclosed by a skull and an outer layer of skin. The level and probability of injury to the head is determined using both the Head Injury Criterion (HIC) and tolerance limits. The HIC has been greatly used to assess the likelihood of head injury while in a vehicles. The tolerance levels are more suited for finite element models, but lack wide scale validation. Different cases of impact were studied using LSTC’s LS-DYNA. This study assesses the risk of injury for wearers of construction helmets or hard hats.
- Construction/industrial helmet
- Impact simulation
- Injury prediction