Research On Human Bionic Chest Module For High Speed Impact Test

The injury rate of the human chest in the high-speed ballistic impact is second only to the head.Once injured,casualties are very likely to occur.Therefore,it is of great significance to carry out high-speed impact damage test research on the human chest in order to improve personnel combat protection and reduce the threat of ballistic killing.However,there is currently a lack of bionic chest modules with high biological fidelity for high-speed impact testing,while traditional dummy tests and cadaver tests have limitations such as poor bionics and small numbers.Therefore,this paper focuses on the high-speed impact injury of the human chest,and develops a human bionic chest module with a certain biological fidelity for high-speed impact injury testing.The main work and conclusions of this paper are summarized as follows:1.Carry out quasi-static mechanical performance test of biological soft tissue to provide data support for the development of bionic chest materials.The pig chest tissue block was selected from the soft tissue,and the skin,fat,and muscle were separated to make a sample,and the quasi-static tensile and compression tests were carried out at the strain rate of 0.1/s and 0.01/s,respectively,and the stress-strain curve of the tissue was obtained.Soft tissue has hyperelasticity,strain rate effects,and strength at high strain rates is higher than at low strain rates.Under the same strain rate,the strength of the skin is the highest,followed by the fat,and the muscle is the smallest.2.Development and selection of human bionic chest soft tissue and bone bionic materials.For soft tissue biomimetic materials,a series of PVC elastomers with different hardness were prepared by formula design based on PVC paste resin,and quasi-static tensile and compression tests were carried out,and the results were compared with soft tissue test results and superelastic constitutive the model characterization verified the mechanical biomimeticity of the developed material.The PPS material was selected to simulate the bones,and the quasi-static tensile and three-point bending tests were carried out on the PPS material.The results were compared with the results of the cadaver test,and it was concluded that the tensile strength was slightly lower,but the tensile modulus,bending strength and bending modulus The amount can reach the human bone range,indicating that the PPS material has a good human bone simulation and can simulate the replacement of bone.3.Starting from the anatomical structure of the human body,the main bone and soft tissue structures of the bionic chest are designed based on the Chinese human body finite element model and bone anatomical measurement data,and then the soft tissue and bones are prepared and assembled using the developed PVC elastomer and PPS materials to obtain a human bionic chest with a total mass of 24.3Kg.Finally,the overall size and weight of the human bionic chest were measured,and the measurement data could meet the relevant standard measurement values,indicating that the bionic chest has a certain degree of bionicity and rationality,and can replace the human body for the response test of chest injuries.4.Carry out chest compression test and high-speed projectile impact test on the bionic chest.The chest compression test obtained the chest width compression load-deflection relationship,and the comparison with the cadaver test found that the consistency was good,indicating that the chest stiffness characteristics were reasonable.In the high-speed projectile impact test,the acceleration response of the third and sixth ribs on the right side was measured by installing an acceleration sensor on the bionic chest rib.