Multiscale Modeling and Analysis of Foreign Object Damage in Ceramic Matrix Composites with the Material Point Method

Multiscale Modeling and Analysis of Foreign Object Damage in Ceramic Matrix Composites with the Material Point Method
Navy STTR FY2010.A

Sol No.:	Navy STTR FY2010.A
Topic No.:	N10A-T010
Topic Title:	Multiscale Modeling and Analysis of Foreign Object Damage in Ceramic Matrix Composites with the Material Point Method
Proposal No.:	N10A-010-0369
Firm:	Advanced Dynamics, Inc. 1500 Bull Lea Road, Suite 203 Lexington, Kentucky 40511-1268
Contact:	Patrick Hu
Phone:	(859) 699-0441
Web Site:	www.advanceddynamics-usa.com
Abstract:	This Small Business Technology Transfer Phase I project is aiming at developing and implementing a multiscale composite model to predict the ceramic matrix composite (CMC) response to the impact loading by foreign objects. In particular, the physics-based model will be applied to describe the multiscale foreign object damage (FOD) phenomena of CMCs due to the complex nature of impact dynamics coupled with the composite architectural/constituent complications at different scales. To catch the essential features of FOD of CMCs with the least computational costs, an effective multi-scale model-based simulation procedure is proposed within the framework of the material point method (MPM) so that the size, rate and thermal effects on the composite system response could be described in a single computational domain. The MPM, as an extension from computational fluid dynamics to computational solid dynamics, is chosen to overcome the mesh distortion and interpenetration problems associated with failure evolution in a multi-phase environment, and thus avoid the need for remeshing as required for the FEM and other Lagrangian based methods. The proposed multiscale model-based simulation procedure will be verified and improved with experimental data available, and a parametric study will be performed to explore the effects of various model parameters on the damage evolution of CMCs subject to foreign object impacts. This STTR effort will lead to a better understanding of the multiscale interaction effects on the CMCs system response so that the microstructures of CMC materials could be optimized to enhance the FOD resistance.
Benefits:	It is proposed in this project that an effective multiscale model-based simulation procedure be developed with MPM so that the multiscale foreign object damage (FOD) phenomena of CMCs due to the complex nature of the impact dynamics coupled with the composite architectural/constituent complications at different scales can be predicted, with least computational costs and best accuracy possible. The physics-based FOD model can then be used to better design/tailor CMCs to enhance their affordability, durability, and overall component life. The MPM, as an extension from computational fluid dynamics to computational solid dynamics, is chosen to overcome the mesh distortion and interpenetration problems associated with failure evolution in a multi-phase environment, and thus avoid the need for remeshing as required for the FEM and other Lagrangian based methods. The resulting product will have tremendous impacts, not only on the prediction of FOD of CMCs, but also on other composite material and structural systems. The key impacts can be summarized as follows: (1)Efficient and robust numerical simulation with the MPM for prediction of FOD of CMCs. (2)General enough multiscale model-based simulation procedure that can be applied to other composite material and structural systems. (3)A foundation for better design/tailor CMCs to enhance their affordability, durability, and overall component life. (4)The solving of the two difficult problems associated with pure FEM and Lagrangian based methods - the first is mesh distortion/entangling in large deformation/fragmentation, and the second is the need for remeshing in the simulation of propagation of discontinuity such as cracks, etc. (5)The easily handle of any large deformation as well as nonlinear material properties by using MPM, thus to obtain much high accuracy in high stress/stain regions. Such advancements are of great importance to the DoD in particular, and to the US innovation-based engineering community in general.

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