Dynamic test system and protection evaluation method based on high simulation physical head model

Abstract

The invention provides a dynamic test system based on a high-simulation physical head model and a protection evaluation method. The high-simulation physical head model is established completely basedon a head anatomical structure and mechanical properties of biological tissues of each part of the head anatomical structure, so that the occurrence process of two common injuries, namely brain tissuecontusion and subarachnoid hemorrhage, can be truly represented; a skull and brain tissue relative tangential displacement measurement system, an intracranial pressure dynamic test system, a skull strain dynamic test system, a skull acceleration dynamic test system and a head overall acceleration test system are established, and six biomechanical injury indexes for evaluating the degree of craniocerebral injury can be obtained; the damage state corresponding to the head model without wearing the protective equipment is taken as a reference; based on the six mechanical damage indexes and the severity of brain tissue contusion and rupture and subarachnoid hemorrhage, mechanical damage evaluation and physiological damage evaluation are conducted on the biological protection efficiency of thehead protection equipment, and therefore comprehensive evaluation of the protection equipment is achieved.

Description

technical field [0001] This application relates to the field of craniocerebral injury and protection testing under the action of blast shock waves, in particular to a blast shock dynamic test system and protection evaluation method based on a high-simulation physical head model. Background technique [0002] The analysis of battle injuries in modern local wars shows that individual casualties caused by explosions account for about 70% of the total casualties, of which the damage caused by the direct action of shock waves accounts for about 60%. The head is an important target organ of the explosion shock wave. According to related reports, the number of servicemen affected by Traumatic Brain Injury (TBI) in the U.S. military is 20% of the total number of service members. ) accounted for as high as 40-60%. The ways in which blast shock waves cause craniocerebral injury mainly include the direct impact of shock waves on the head, the impact of flying fragments on the head, t...

AI Technical Summary

Problems solved by technology

Although a large number of animal experiments, pathophysiological analysis, and numerical simulation studies have established the relationship between craniocerebral impact injury and head acceleration, and determined the corresponding injury criteria, the relevant theory can only be applied to the overall response stage of the head. , but cannot analyze the stress wave-dominated physical process of craniocerebral injury under the direct action of the blast shock wave

[0004] In addition, in the prior art, when testing the protective performance of the head protector, experiments are carried out relying on a human body model with a low degree of simulation (such as a car crash dummy), which usually uses a damage index based on the overall acceleration of the head To evaluate the protective performance of the head protector, the results obtained through such experiments can only reflect the protective performance of the head protector one-sidedly. The dynamic response process of the tissue does not establish a mechanical damage index based on the brain tissue; second, this type of model only focuses on the overall movement of the head structure, and cannot obtain the experimental data of the head in the stress fluctuation stage, which has obvious limitations

[0005] To sum up, relevant scholars have put forward various hypotheses that the blast shock wave directly causes craniocerebral injury. Due to the lack of further verification of biological and physical models, the corresponding mechanism of craniocerebral injury is still unclear.

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