Lightweight Design of Automotive Front End Material-Structure Based on Frontal Collision

Abstract

<div class="section abstract"><div class="htmlview paragraph">The front end structure is an important role in protecting the vehicle and passengers from harm during the collision. Increasing its protective capacity can be achieved by increasing the thickness or replacing high-strength materials. Most of the current research is analyzed separately from these two aspects. This paper proposes a multi-objective optimization method based on weighting factor analysis, which combines material and thickness selection. Firstly, the optimized components are determined based on the 100% frontal collision simulation results. Secondly, six thicknesses and two materials of the front part of the vehicle body are selected as design variables to construct an orthogonal test design. In this paper, a weight-based multi-factor optimization method is used to numerically analyze the response results obtained by orthogonal experiments. Analyze the impact of each factor on the optimization goal to select the most reliable optimization. This optimization method can select the best material and component thickness combination scheme. The results show that the mass of the selected parts are reduced by 16.5%; the total energy absorption is increased by 5.2%; the intrusion in the dash is reduced by 8.9%; and the peak acceleration of the B-pillar is reduced by 39.2%.The material-structure integration optimization method is an effective method to solve the contradiction between lightweight and crashworthiness.</div></div>

Body optimization approach of sedan structure for improving small overlap impact rating

“…In order to achieve the energy absorption target, the energy absorbed by the body is reasonably distributed to the engine-room structure based on the principle of energy management in the collision process. Zhang et al [19] found that the speed of more than 80% of the vehicles under the small overlap impact condition is 20-30km/h at the end of the collision. Therefore, the terminal velocity of the vehicle can be set as 25km/h in the preliminary design.…”

“…Some previous physical tests and computer simulation studies indicate that engine room structure, vehicle front wheel and passenger compartment place a significant role in improving small overlap impact rating [13][14][15][16][17][18]. Zhang et al [19] investigated the energy-absorption performance of a B class vehicle in small overlap impact. They found that the vehicle could reach good rating when the left front rail absorbs 31.47% collision energy, the left shotgun absorbs 9.79% collision energy, and the subframe absorbs 17.48% collision energy.…”