Advanced Material Characterization and Structural Certification (AMCSC) Volume 2 of 2
Abstract
Regularized Extended Finite Element Methodology (Rx- FEM), is currently implemented in the BSAM software including the framework required for geometrically nonlinear analysis. The input data requirements for Discrete Damage Modeling (DDM) including the fatigue material characteristics for DDM models in this work have been addressed at the University of Texas Arlington Advanced Materials and Structures Lab (AMSL). Namely, experimental apparatus was designed, manufactured and applied to transverse and in-plane shear S-N curve determination in fully revisable fatigue R=-1 regime as well as measurement of delamination growth rate at R=-1. BSAM was extended for progressive failure analysis with spatially random strength and fracture properties The stochastic property distributions lead to realistic strength prediction and appear to account for the volume scaling of strength.. Kink band formation and effective fiber direction fracture toughness were investigated. A 4 point bend (4PB) test of notched unidirectional composite was utilized by AMLS. The test underwent significant evolution during the resulting in a 2ply thick specimen with Plexiglas unbuckling guides designed by AMLS. These 4PB specimens were simulated by using BSAM. It was found that the best correlation with experiment in terms of failure loads and kink band formation was obtained by using geometrically nonlinear formulation with the nonlinear shear properties independently characterized by AMLS. This finding was counter to initial expectation of using continuum damage mechanics (CDM) approach, which had difficulty in failure localization within realistic range of material property values.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 17, 2020
- Accession Number
- AD1133940
Entities
People
- A. V. Makeev
- B. Van Der Vossen
- E. V. Iarve
- H. K. Adluru
- K. H. Hoos
Organizations
- University of Texas at Arlington