The Numerical Simulation Optimization Of Stretchability For Nano Flexible Composite Electronic Materials

Because nano-flexible elecrical material have strong stretchability, it can be bent like a rubber bar, and can be stretched like a mechanical spring, not resulting damage, being with well electrical performance. Studies show that serpentine interconnects can increase the stretchability of nano-flexible elecrical material, while horse-shoe interconnect can do more. Interconnect optimization can increase the stretchability of nano-flexible elecrical material.This paper studies the horse-shoe interconnect fully abonded to substrate, with optimizing many parameters. Studies involved in this paper are finished through numerical simulation analysis,establishing the three-dimension horse-shoe film-substrate model with ABAQUS nonlinear finite element software. This paper shows the establishing modle process from aspects of establishing geometrical modle, meshing, assmbly and setting steps. It is an important way to use optimized substrate prestrain to increase nano-flexible elecrical material stretchability. Then this paper studies the relation between metal interconnect geometrical parametres and material parametres and the prestrain maximum and the relation between substrate geometrical parametres and material parametres and the prestrain maximum. And this paper studies the relation between prestrain and metal interconnect elastic-stretchaility ratio. The result shows that the more substrate prestrain, the more horse-shoe interconnect elastic-stretchability, if the metal interconnect doesn`t occur plastic deformation.Optimize geometrical parametres and material parametre of horse-shoe interconnect, studying the interconnect elastic-stretchability ratios in the conditions with prestrain and without prestrain. The results show that no matter prestrain exsists or not, interconnect elastic-stretchaility ratio gets less along with the interconnect width, thickness getting larger, while interconnect elastic-stretchaility ratio gets larger along with horse-shoe radius,horse-shoe degree getting larger. And the larger the Young modulus is, the larger the interconnect elastic-stretchaility ratio is. Meanwhile, optimize the horse-shoe interconnect structure, from the latter one to the hollow one. The result shows this design can increase interconnect elastic-stretchaility ratio.The stretchability of nano-flexible electrical material is from metal interconnect and flexible substrate. Optimize geometrical parametres and material parametres of substrate, similarly increasing nano-flexible electrical material stretchability. Study results show that substrate with larger Young modulus makes less stretchability; elastic-stretchability is insensitive to substrate thickness when substrate thickness is much larger than the interconnect thickness. During applying process, always encapsulate nano-flexible electrical material, putting an encapsulation on the interconnects and islands, to avoid physic and environment damage. But the encapsulation decreases the stretchability much. Through encapsulation optimization, make the encapsulation center part hollow, encapsulation not abonded to the interconnect, thus encapsulation make little effect to metal interconnect stretchability. The results show that the center part hollow encapsulation can increase metal interconnect stretchability compared to the latter encapsulation.