Chinese Human-bone Biomechanical Test and Material Parameter Identification
A digital model of the human body is an important tool for vehicle collision-safety research,such as injury mechanism research and protection-device development.It is also the core means of virtually evaluating vehicle safety in the future.The constitutive parameters of the bone materials are key to determining the accuracy of the digital model.However,for a long time,the material constitutive parameters used in various digital human-body models,both domestic and foreign,have been derived from testing data from European and American bodies.Systematic research on the biomechanical characteristics of the Chinese human body is lacking,which greatly limits the development and efficient application of digital human-body models in China.To clarify the differences in skeletal biomechanical characteristics between Chinese and foreign individuals,and to obtain mechanical data on Chinese human-skeletal materials,a bone-material test study was conducted on a Chinese male cadaver.The femur,tibia,fibula,skull,ribs,ilium,and sternum were dissected.The cortical-bone regions of each bone were sectioned,and a large number of cortical-bone specimens were prepared using high-precision processing methods,such as metallographic grinding-polishing machines and CNC(Computer Numerical Control)engraving machines,with dimensions of approximately 12 mm×2 mm×0.5 mm.The elastic modulus,yield stress,tangent modulus,and effective plastic strain of the specimens were automatically and effectively obtained using the three-point bending test and improved beam-theory method.The results show that the material constitutive parameters of the Chinese-human cortical bone obtained in this study are within the data range of European and American human bodies in the literature,and the material parameters of the different bones differ significantly(p＜0.05).The constitutive parameters of the key skeletal materials provided by the Chinese human body offer preliminary data as a reference for developing a complete automotive crash-safety digital model with independent intellectual-property rights that conforms to the characteristics of the Chinese population.
automotive engineeringmaterial constitutive parametersthree-point bending testbonevehicle crash safetydigital human body modelbiomechanics
NETL
NSTL
万方数据
