Let's start with the structure of the human skull. The human head consists of a hard skull and soft intracranial objects, which refer to brain tissue, cerebrospinal fluid, and cerebral blood vessels. The skull that forms the cranial cavity is inflexible, because it is easy to fall under the impact of external force, and the degree of damage is proportional to the magnitude of the external force. The buffer coefficient of intracranial objects is only about 10%, and once damaged, it is almost impossible to repair. The reason for wearing a helmet is to protect personal safety and to be afraid of accidents when riding a motorcycle or electric vehicle, so whether it is a driver or a car, a helmet should be worn, it can protect and reduce our head injuries. The secondary function is to prevent wind, sand, light, rain and sun. It can be said to be many birds with one stone.
A helmet consists of an outer shell, a cushioning layer, a liner, a wearing device and accessories. The shell is made of tough material, which can absorb a certain amount of impact energy and can directly resist the impact of external force on the brain. The buffer layer can absorb more impact energy than the outer shell, and has sufficient performance to buffer mechanical impact. The fatality rate of motorcycle accidents is 59.6%, and the fatalities are almost all head injuries, which are fatal. The main head injuries were skull base fractures and brain contusions. About 64.8% of head injuries occurred without a helmet.