1999, Volume 1, Issue 3
Strategic Study of CAE >> 1999, Volume 1, Issue 3
Thoughts on Scientific Issues in Engineering Material Research
China Academy of Launch Vehicle Technology , Beijing 100076, China
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Abstract
On a lot of occasons in aerospace engineering, materials work in extreme situastions. Specific characteristics of materials are therefore required. Although some achievements have been accumulated in material research at home and abroad, deeper investigations are still needed on a more precise model and state equation corresponding to the damage of a specific material. These will include the aerodynamic heating of the advanced warhead reentering the atmosphere and the erosion of the space articles as well as the increase of the retreat value of the protection material caused by the coupling effect of both, the threat to space vehicles caused by high speed collision of space junk and micrometeors, and, in particular the damage and destruction caused by nuclear explosion and laser weapon which in fact is and the delamination caused by thermal shock waves of actual radiation. All of these belong to the response of materials to high speed collision.Electromagnetic materials such as radome material, infrared stealth material and EM shielding material are all EM functioning materials with EM wave of different lengths. As solid substances, they will respond to penetration, absorb and reflection. Different EM functioning materials possess different macroproperties of physical parameters. However, several parameters are general, such as dielectric constant, permeability and tangent of loss angle. Clear understanding of the relations among these parameters and the microstructures of materials will provide a scientific basis for materials design and innovation.
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