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2017-08-08
Technical Paper
2017-01-5004
Nora Ramirez, Ulises Figueroa, Andrea Guevara-Morales, Alejandro Rojo
Simulations of impact events in the automotive industry are now common practice. Vehicle crashworthiness simulations on plastic components cover a wide range of strain rates from 0.01 to 500 s-1. Because plastics mechanical properties are very dependent on strain rate, developing experimental methods for generating stress-strain curves at this strain rate range is of great technological importance. An impact pendulum was modified so that the impact-deformation-fracture process of a specimen hit by the swing of a pendulum could be monitored. Forces were measured with a piezoresistive sensor while deformation was recorded with a high-speed video camera. Engineering stress-strain curves were obtained. Strain rates between 90 to 175 s-1 were achieved. Two polypropylene based polymers were tested at 20°C and -20°C.
2017-03-28
Journal Article
2017-01-0225
Gabriela Guerra, Ulises Figueroa-López, Andrea Guevara-Morales
Abstract The rapid growth of the emerging markets has pushed the automotive original equipment manufacturers to relocalize production to reduce manufacturing and logistic costs. To ensure an efficient and flexible supply chain, local suppliers are appointed. However, the characteristics of materials available in each region may have minor differences, and when geometry and process design recommendations that were developed for certain materials are implemented for materials under a different regional standard, different results are obtained. Such is the case of the clutch disc spacer bolt, in which its compression during riveting has a direct effect in the noise and vibration isolation of the vehicle.
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