Projects in Additive Manufacturing and Charged Polymers at ARL

Additive Manufacturing (AM) processes are revolutionizing the on-demand capabilities of current front-line missions for the modern soldier, allowing unprecedented levels of manufacturing versatility and multi-functionality as needed. As the technology continues to mature, new materials and methods for evaluating AM parts will be required. In this seminar, a variety of important topics related to polymer additive manufacturing at the US Army Research Laboratory are discussed, including applications in the areas of: recycling of front-line battlefield polymer waste for on-demand AM, fabrication of novel filaments for AM processes, and construction of nanocomposites using AM. Techniques for evaluating mechanical performance of AM polymers are also discussed, including topics in the areas of interfacial mechanical behavior and fracture properties.

Nikki Zander, Dan Cole, Kevin Hart, and Frank Gardea from the Army Research Lab will be joining us at the Johns Hopkins University Homewood Campus. Seminar will be held at 11 AM in Malone Hall, G 33/35.

Description
Progressive damage modeling of composites under low velocity impact and high velocity impact is of interest to many applications including car crash, impact on pressure vessels, perforation and penetration of thin and thick section composites. MAT162 rate dependent progressive composite damage model in LS-DYNA is considered as the state of the art. This short course will include the theory and practice of MAT162 composite damage model with applications to low and intermediate impact velocities, understanding the LS-DYNA programming parameters related to impact-contact, damage evolution, perforation and penetration of thin- and thick-section composites with and without curvature. The following topics will be covered in this one-day short course with illustrative examples. A CD with content of the course will be provided.

Topics Covered in this Short Course:

Introduction to LS-DYNA
Writing a structured LS-DYNA keyword input deck from scratch for a unit single element (USE) under tension, compression, and shear

Introduction to Continuum Mechanics and Composite Mechanics
Concepts of large deformation finite strain theory
Deformation gradient
Cauchy-Green strain tensors
Piola-Kirchhoff and Cauchy stress
Stiffness matrix for orthotropic and anisotropic composite materials

Composite Material Models in LS-DYNA for Shell and Solid Elements

Theory and Practice in MAT162 Progressive Composite Damage Model
Unit Single Element analysis

Low Velocity Impact (LVI) and Compression after Impact (CAV) Applications
For Shell and Solid Elements

Perforation Mechanics of Thin-Composites with MAT162 and Solid Elements

Penetration Mechanics of Thick-Composites
Depth of Penetration Experiments
Ballistic Impact Experiments

Application of MAT162 in Engineering and Research Problems
Impact on Composite Cylinders and Spheres with and without Internal Pressure and/or Blast Pressure
Penetration and Perforation of Sandwich Composites
Normal and Oblique Impact
Multi-Hit Ballistics
Meso-Mechanical Modeling of Woven and 3D Composites

Click here to register. Registration closes on January 15, 2015.