Analysis of digital light synthesis based flexible and rigid polyurethane for applications in automobile bumpers

Abstract

The current work presents the design of automobile bumper using two novel materials, Flexible Polyurethane and Rigid Polyurethane, which meets the desired functional requirements for better performance. Two different designs for automobile bumpers have been made and corresponding deformation and stresses are investigated using Finite Element Analysis. The impact tests were carried out for two different materials of automobile bumpers. Scanning Electron Microscopy and Energy Dispersive Spectroscopy were done to characterize and compare the bumper materials with Rigid Polyurethane fabricated by Digital Light Synthesis. Both Flexible Polyurethane and Rigid Polyurethane outperform the existing bumper materials in terms of the impact strength. Among the new materials investigated, Rigid Polyurethane displays less deflection and Von-mises stresses and hence it may be suitable to replace the existing bumper materials in heavy vehicles with Rigid Polyurethane. The impact strength of Flexible Polyurethane is more than Rigid Polyurethane and hence this material may replace the existing materials in passenger cars.

Experimental investigation and crashworthiness analysis of 3D printed carbon PA automobile bumper to improve energy absorption by using LS-DYNA

“…Bumper manufacturers must meet the following criteria: Components such as radiators and headlights that are placed immediately after the bumper should function the same as before and after the impact, the car bumper must withstand an impact of 4.023 km/h (2.5 mph) across the full width and an impact of 1.609 km/h (1.609 km/h) at the corners of the parked vehicle and the bumper should place from 16 to 20 inches above the road surface. [21][22][23][24][25] All bumpers must meet the above criteria. As shown in Figure 2, the bumper has visible functional and safety damage in the vertical pendulum collision test at 4 km/h and pendulum collision test at the corner of 1.0 km/h.…”

Finite Element Analysis of Nylon Based 3D Printed Autonomous Underwater Vehicle Propeller

“…The influence of infill parameters on the mechanical properties of the parts was studied using eighteen distinct geometries. FEM is an effective and reliable tool for stress analysis in isotropic, orthotropic, and composite materials 29 .…”