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Technical Paper

Development of Dry Lubricants for Stamping of Automotive Parts

1998-09-29
982303
Introduction of a new lubricant in the press shop involves various demands beside the pure tribological. Often, environmental concerns are considered most important. For the automotive industry specifically, compatibility with existing cleaning and painting systems as well as different joining techniques are key factors for acceptance of a new lubricant. The lubricants must of course also provide enough corrosion protection during storage. The present paper reports results from a screening of existing dry lubricants. Critical properties for further development are identified and some results from improved products are also included.
Technical Paper

Finite Element Simulation of the TRIP-effect in Austenitic Stainless Steel

2004-03-08
2004-01-0885
A requirement for any material to be accepted by the automotive industry is that finite element (FE) simulations can be used to predict its behavior in both forming operations and crash conditions. So far, FE-simulations have been less accurate for austenitic stainless steel than for lower alloyed steels. The reason for this is the temperature sensitivity of the Transformation Induced Plasticity (TRIP) - effect in the low-alloyed austenitic grades of highest relevance for the automotive industry. Typically, temperature effects are not considered when sheet forming is simulated today. Therefore, new material models as well as a different simulation approach must be introduced for austenitic stainless steel compared to the materials used today. This paper describes the implementation of a new material model into LS-DYNA, which is capable of predicting the TRIP-effect in austenitic stainless steel in different forming operations with different temperature scenarios.
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