Graduate Thesis Or Dissertation
 

A Novel Progressive Damage and Failure Analysis Model for Matrix Compression using 3D Continuum Damage Mechanics and Smoothed Particle Hydrodynamics

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tm70n332z

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  • The matrix compression behavior is assumed similar to tension, and many material's elastic and damage parameters are considered equal in tension and compression but experimentally not explored. This assumption leads to unrealistic or very far from the actual behavior of the matrix under compression. Moreover, the pre-existing implemented Abaqus models for Progressive Damage and FailureAnalysis (PDFA) are based on 2D lamina properties and only account for in-plane stresses on the lamina level. Due to this simplistic nature, the PDFA of thick laminate composite materials poorly predicts the matrix’s failure under compression, leading to less reliable and unsafe designs. To address this issue, first, matrix compression is experimentally explored. The strain energy release rates (i.e., fracture toughness ) for matrix compression failure were determined from experimental data. Second, a new PDFA model is developed based on 3D Continuum Damage Mechanics (CDM) and in conjunction with the smoothed Particle Hydrodynamics (SPH) technique. The proposed model is then implemented in commercially available finite element code Abaqus/Explicit using user-defined material (VUMAT) and validated with experimental results. Further, a qualitative evaluation and comparison of the proposed model and the existing model are performed on a modified compact compression specimen for various layup laminates under tension and compression.
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