Abstract
In an effort to improve impact energy-absorption characteristics, this study introduces a cylindrical crash absorber (CAP) with discontinuous protrusions and a continuous local-expansion plastic-forming method for its manufacture. The mechanical properties of the cylindrical energy-absorption structure were modified by installing multiple particle protrusions on the cylinder sidewall to reduce the initial pickup load and improve the impact energy-absorption performance. To facilitate manufacture of the proposed CAP, a cylindrical rubber piece was placed into a cylindrical tube and pressure was applied to the rubber from both ends of the tube. The CAP was formed by the bulging force of the rubber. The formability was verified by developing a successive local bulge-forming experimental device and comparing the manufactured CAP with the results of numerical simulations. Testing of quasi-static collapse conducted on a CAP manufactured using this device verified the effectiveness of the proposed CAP design and its plastic-forming method. It was determined that this design reduced the initial peak load, and the crash absorber could maintain stability over a long, continuous distance during crushing deformation.
Highlights
The crash absorber with discontinuous protrusions (CAP) consists of a cylindrical tube with several discontinuous protrusions that are equidistantly spaced along the axial direction
To obtain a more stable cushioning effect, to minimize the damage caused by an impact collision, we designed a new type of cylindrical crash absorber (CAP) with discontinuous protrusions, and developed a CAP manufacturing device that uses a successive partial rubber-bulging method
The performance was verified through trial experiments and numerical simulation, and the following conclusions can be drawn: (1) When a cylinder is used as a crash absorber, the initial peak load is relatively large, and the unstable cushioning performance causes a high rate of load fluctuation
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. There are many application examples of crash energy absorbers [1,2,3]. It is necessary to develop high-performance crash energy absorbers that can maintain stable crushing deformation for as long as possible. High-quality processing with a simple method is an important research objective
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