Abstract
The experiment models based on the hyperboloid shallow shells that represent automobile panel's surface features are established. The effects of material properties and geometric conditions condition on the stiffness of hyperboloid shallow shell are investigated experimentally. The influences of panel thickness and geometric conditions on stiffness are very obvious. Stiffness increases with increasing of the panel thickness, and stiffness doubled as increasing in thickness with 0.1 mm. The effect of thickness on stiffness is far greater than that of blank holding force. The greater the arc height of punch, the greater the stiffness. And stiffness increases nearly by five times with arc height of punch is from 3mm to 9mm. The effect of arc height of punch on stiffness is far greater than that of materials mechanical properties. The stiffness is varied with different panel material properties by the same forming and stiffness test conditions. The decrease of yield strength is beneficial to the panel stiffness. The appropriate choice of materials and forming process condition is important in meeting necessary requirements for the energy-saving, lightweight and reducing wind resistance design in automotive industry.
Highlights
In order to develop a comprehensive understanding on the stiffness of automobile, large numbers of experiments are performed in this work to study the influences mechanical properties and geometric conditions, such as thickness and arc height on the stiffness of hyperboloid shallow shells of the automobile panel
The experiment study models of which based on the hyperboloid shallow shells that could represent automobile panel surface features is established
The experiment research works of effects of material properties and geometric conditions condition on the stiffness of hyperboloid shallow shell are obtained
Summary
Profile radius 35 material properties parameters, forming process parameters and springback of single curved surface shell (cylindrical shallow shell) [11, 14]. The sag depression of the deflection after the forming, spring and stiffness loading of the doubly curved flat shell (hyperboloid Shallow Shell) is different with cylindrical shallow shell’. It is a very complicate geometric nonlinear problem. In order to develop a comprehensive understanding on the stiffness of automobile, large numbers of experiments are performed in this work to study the influences mechanical properties and geometric conditions, such as thickness and arc height on the stiffness of hyperboloid shallow shells of the automobile panel. All conclusions provided a technical approach in the automobile panel production
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