Pan American Materials Congress: Advanced Manufacturing: Polymer, Composites, and Metals
Sponsored by: Third Pan American Materials Congress Organizing Committee
Program Organizers: Sonia Brühl, UTN - National University of Technology; Ricardo Castro, University of California, Davis; Dachamir Hotza, UFSC

Wednesday 10:10 AM
March 1, 2017
Room: Marina D
Location: Marriott Marquis Hotel

Session Chair: Sonia Brühl, UTN; Ricardo Castro, University of California, Davis

10:10 AM  
Comparative Mechanical Analysis between Epoxy Composite Reinforced with Random Short Cuarua Fibers and Aligned Long Curaua Fibers: Natália Maciel1; Carolina Ribeiro1; Jordana Ferreira1; Janaina Vieira1; Frederico Margem1; Carlos Maurício Vieira1; Sérgio Monteiro1; 1UENF
    Synthetic fibers have been used for many years ago to attend the demands requires by the most technological fields, but their use have been questioned due to the impact of them about the environment. In this way, the natural fibers have received big attention because some of their characteristics, besides low cost, they are flexible, viable, renewable and considered abundant substitutes. Thus, this paper will talk about curaua fibers that are belonging to the family Bromeliaceae, and it intends to compare the mechanical strength between epoxy composite reinforced with random short Curaua fibers and aliged long curaua fibers.

10:30 AM  
Damage Evaluation of Impact by Low-speed on Fiberglass Composite with Laminates Aluminum 2024-T3: Eduardo Jose Trujillo1; 1Centro de Ingeniería y Desarrollo Industrial
    This experimental research was done with composite materials due to increased use in aircraft, which are affected by low-speed impacts by 13% of all repairs, the effect is analyzed by adding layers of aluminum 2024-T3 in laminates of woven fiber glass and laminates with orientation 0°/90°. They specimens with two open holes spaced 6 mm diameter (12 and 18 mm), measured from its center the point of impact were analyzed. It was observed an increase in the absorption of impact energy 5.69%, while to woven fiber 0.47% was obtained, in this way increase the tolerance to impact damage. The damaged area was evaluated by ultrasound, concluding that there is a slight increase in the damaged area due to the addition of aluminum.

10:50 AM  
Numerical Modeling of High-Velocity Impact Welding: Ali Nassiri1; Shunyi Zhang2; Tim Abke3; Brad Kinsey2; Glenn Daehn1; 1The Ohio State University; 2University of New Hampshire; 3Honda R&D, North America
    To support the lightweighting aim in the automotive industry, high-velocity impact welding (HVIW) can be used to join dissimilar metals. The manufacturing industry often relies on numerical simulations to reduce the number of trial-and-error iterations required during the process development to reduce costs. However, this can be difficult in high strain rate manufacturing processes where extremely high plastic strain regions develop. Thus, a traditional Lagrangian analysis is not able to accurately model the process due to excessive element distortion. In order to further understand the science behind HVIW processes and benefits of various numerical simulation methodologies, two methods were used to simulate Al/Fe bimetallic system. First, a Smoothed Particle Hydrodynamics (SPH) model of two impacting plates was created. Using SPH method, metal jet emission were investigated which previously was impossible. The results then were compared with Arbitrary Lagrangian-Eulerian (ALE) method. Finally, the numerical results were compared with experimental tests.

11:10 AM  
Reducing Radiation Exposure to the Rectum during Prostate Cancer Radiation Therapy using NiTi Shape Memory Alloy: Hossein Lavvafi1; Ayush Tiwari2; Ahmadreza Jahadakbar2; Mahbod Pourriahi2; Mohammad Elahinia2; Vijaya Devabhaktuni2; E. Ishmael Parsai3; 1University of Toledo Medical Center ; 2University of Toledo; 3University of Toledo Medical Center
    An effective radiotherapy treatment entails maximizing radiation dose to the tumor while sparing surrounding tissues. With the advent of SBRT in treating tumors including prostate where ablative dose is delivered in smaller number of fractions, rectum remains a dose limiting organ and at the risk of rectal toxicity or secondary cancer. An effective solution to such problem is to physically displace the organ at risk. This research presents an organ re-positioner device that is designed to displace the rectum away from the path of radiation beam employing a NiTi alloy that is shape-set for displacing the rectum upon actuation. A circuit has been designed for inducing and controlling this reversible austenitic-martensitic transformation in a reliable, reproducible, and safe manner. The study finds the novel organ re-positioner device to be a promising tool that can be applied in a clinical setting for minimizing dose to the rectum during prostate radiation treatment.

11:30 AM  Invited
Selective Laser Sintering of Polyamide/Hydroxyapatite Scaffolds: Frederic Dabbas1; Steferson Stares1; Jose Mascheroni2; Dachamir Hotza1; Gean Salmoria1; 1UFSC; 2Alkimat
    Selective Laser Sintering (SLS) is an additive manufacturing technique which enables final products to be processed without additional machining. SLS permits the fabrication of implants and scaffolds with complex geometry for biomedical applications. In this study, composite scaffolds of polyamide (PA2200) filled with particles of hydroxyapatite (HA) were fabricated using SLS. The microstructure and mechanical properties were characterized. The effects of SLS processing parameters, including particle content and laser power, were investigated. Particle content and laser energy play a key role in the final density and mechanical properties of the sintered components. This study demonstrated that HA reinforced PA can be successfully manufactured by SLS with controlled porosity features.