The Virtual Test Research On The Vehicle 40% Offset Deformable Barrier Impact Crashworthiness

Every year vehicle traffic accidents lead to a large number of casualties and social property losses around the world, thus vehicle safety problems have been attached great importance by the entire automotive industry. Frontal impact is one of the normal crash types, which cause severe injure and death. Research on frontal crashworthiness of body structure will decrease the injury to passenger, so it's urgent and necessary to do some research in the field.In the world frontal impact test statute includes two typical parts: 100% impact (full impact) and 40% offset impact. In the 40% offset impact, only one front side of the vehicle participates the energy absorption of collision, it is a great deformation under this kind of collision shape, the serious invasion of cab can bring the injury to passenger. Traffic Accident statistics also show, that the incident of the serious occupant injuries is the highest in this collision shape, 40% offset deformable barrier impact test major evaluations of the safety body. The full impact and 40% offset impact form two different injury mechanism to occupant, the evaluation focus on the body and occupant restriction system is different, the actual impact test research have shown that these two types of tests can not be substitutes. Now the research on full impact is done in china, but little research on 40% offset impact. It is necessary to comprehensively improve the frontal impact safety performance, taking into account the needs of the frontal impact of these two types, it's necessary and meaningful to do research on 40% offset impact.Research is made on the vehicle 40% offset deformable barrier impact crashworthiness based on virtual test technique using explicit nonlinear finite element method.At first, the fundamental theories in study of computer simulation are described. According to the state standards《The Frontal Offset Collisions of Vehicle Occupant Protection》, establish the finite element model of offset deformation barriers and have a validation. And choose a saloon car for the research object; establish the finite element model of 100% frontal impact according to CMVDR294. Compare the results of simulation and experiment, the compare certification shows that the vehicle model is correct and the virtual test method is effectiveness in this paper.On this basis, accordance to European regulations ECE R94.01, establish the finite element model of 40% offset impact, based on virtual test method have 40% offset collision crashworthiness analysis, and establish the direction and countermeasure of improving the 40% offset collision crashworthiness.Finally, according to the measure of improving the vehicle's 40% offset collision crashworthiness, have four aspect measures to improve the design research on the vehicle body, including: the high strength steel strengthening cab of improved design, the front longitudinal beam of improved design, the front longitudinal beam connection improved design and crash-box and bumper of energy-absorbing improved design. Improved design to a certain extent increase the 40% offset collision safety performance.The research results in this thesis offer important references for vehicle 40% offset impact computer stimulation study of our country automotive corporations.