In recent years, strict weight reduction targets have pushed auto manufacturers to use lighter gauge sheet steels in all areas of the vehicle including exterior body panels. As sheet metal thickness are reduced, dentability of body panels becomes of increasing concern. Thus, the goal becomes one of reducing sheet metal thickness while maintaining acceptable dent resistance. Most prior work in this area has focused on quasi-static loading conditions. In this study, both quasi-static and dynamic dent tests are evaluated. Fully assembled doors made from mild, medium strength bake hardenable and non-bake hardenable steels (IF steels - interstitial free steels) are examined. The quasi-static dent test is run at a test speed of 0.1 m/min while the dynamic dent test is run at a test speed of 26.8 m/min. Dynamic dent testing is of interest because it more closely approximates real life denting conditions such as in-plant handling and transit damage, and parking lot damage from car door and shopping cart impact. The dent resistance performance of the three steel types are examined and compared for both static and dynamic test conditions. The results show that bake hardenable steel has better dent resistance than a non-bake hardenable steel. Steel body panels perform better in dynamic denting than in static denting. Dependence of denting load on the material yield strength follows a different function for bake hardenable steels when compared with non-bake hardenable steels. The dependence of denting load on the panel thickness also follows a different function between test locations with significantly different panel stiffness values. Bake hardenable steels demonstrate unpredictably higher denting energy under both quasi-static dent testing and higher speed dent testing.
Static and dynamic dent resistance performance of automotive steel body panels
Statischer und dynamischer Beulwiderstand von Karosserieblechen
1997
7 Seiten, 9 Bilder, 4 Tabellen, 9 Quellen
Article/Chapter (Book)
English
Static and Dynamic Dent Resistance Performance of Automotive Steel Body Panels
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