Accession Number:

AD1053504

Title:

Predictive Models for Dynamic Brittle Fracture and Damage at High-velocity Impact in Multilayered Targets

Descriptive Note:

Technical Report,13 Sep 2010,12 Nov 2015

Corporate Author:

NEBRASKA UNIV LINCOLN LINCOLN United States

Personal Author(s):

Report Date:

2016-11-01

Pagination or Media Count:

12.0

Abstract:

The goal of this project was to understand the initiation, growth, and propagation of cracks and damage in brittle protective systems induced by impact. For this purpose, we have developed peridynamic models and used them to analyzed dynamic fracture in glass, multi-layered glassPC systems, Functionally Graded Materials FGMs, polycrystalline AlON, and fiber-reinforced composite FRC materials. For the first time we were able to explain why dynamic cracks branch in brittle homogeneous and isotropic materials. We also uncovered the dynamic mechanisms that are behind the development of various crack systems and fragmentation in the impact on multi-layers glass. We have also discovered the factors that influence the crack path direction and speed in FGM and FRCs. For the first time, we were able to replicate experimentally observed transition between fragmentation front and localized cracking in AlON. The models developed under this project represent a first step in developing the necessary knowledge for designing brittle protective systems with enhanced performance.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE