**6. References**

	- [6] Elyasi M, Bakhshi-Jooybari M, Gorji A, Hossinipour SJ, Norouzi S (2008) Numerical and experimental investigation on forming metallic bellows in closed and open die hydroforming. Steel Research International. 79: 148–154.

**Chapter 4** 

© 2012 Engel and Buhl, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

© 2012 Engel and Buhl, licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

**Forming of Sandwich Sheets Considering** 

For many applications there are claims concerning the metal sheet, which cannot be reached with a single sheet. Composite materials, which can be classified in fiber-composites, sandwich materials and particle-composites are increasing year by year [1]. Sandwich respectively laminates with various thicknesses and materials of the different layers offer highly useful properties. As seen in Figure 1 every material has different mechanical, acoustical, tribological, thermal, electrical, chemical as well as environmental and

Figure 1 illustrates an example of a fictive constellation of a composite. The price of the raw material itself has to be lower than the price of stainless steel. The nearly symmetrical sandwich should be resistant against corrosion and appear like stainless steel. For application in the automotive industry, it should be highly formable and reduce vibrations.

**Changing Damping Properties** 

Additional information is available at the end of the chapter

**Figure 1.** Classification of composites; preparing of sandwich sheets

Bernd Engel and Johannes Buhl

http://dx.doi.org/10.5772/50565

**1. Introduction** 

**1.1. Sandwich sheets** 

technological properties.

