Entries by Benjamin Boesl

Adhesive Bonding of Composite Joints

Polymer matrix composites have shown improved properties over traditional materials especially when considering weight normalized properties such as specific strength and stiffness. While this has been known for some time, the implementation of composites as structural materials still have complications due to limitations in bonding and fastening complex geometries.  Currently, composite panels bonding is completed primarily through the drilling of holes in critical locations within the panel and securing with the use of fasteners such as rivets and bolts. The mechanical fasteners link multiple panels together and also provide an added level of protection by mechanically limiting propagation of failure originating near the bond but in the panel itself. While this process is effective there is a significant weight cost, and the manufacturing of the necessary hole geometries has significant implications for overall performance, resulting in elevated stress concentration levels and delamination in the composite panel. Mechanical fasteners have consistently lead to significant over-design and a loss in overall efficiency gained from the improved specific strength.

Graduate Courses

EMA5507C: Analytical Techniques in Material Science

Fundamental theories and techniques of the analytical methods for materials including: X-ray diffraction, scanning and transmission electron microscopy, thermal and surface analysis, and vacuum systems. Prerequisite: EGN 3365.

 

Semester Taught: Spring 2013, Fall 2013, Fall 2014

 

EMA5295: Principles of Composite Materials

The mechanical behavior of composite materials used in the automotive, aircraft and sporting goods industries; material and laminar properties; design of composites; failure analysis; and environmental effects. Prerequisites: EGM 5615 or permission of the instructor.

 

Semester Taught: Fall 2013, Fall 2014, Spring 2016

 

EGM 6570: Fracture Mechanics

Griffith’s and Irwin’s fracture criteria; stress intensity factors evaluation; crack- tip plastic zone; fracture toughness measurement; crack initiation; fatigue crack growth; stress corrosion cracking. Prerequisite: EGM 5615.

 

Semester Taught: Spring 2015

Undergraduate Courses

EML3500: Mechanical Design I

Introduction to the design process. Review of static and dynamic loading, resulting normal and shear stresses, principal stresses. Engineering materials, static and fatigue failure theories. Machine element design including screws, bolts, fasteners, welded joints. Open-ended design projects.

 

Semester Taught: Spring 2013, Spring 2014, Spring 2015, Spring 2016, Fall 2016

 

EML4501: Mechanical Design II

Continuation of design analysis of elementary machine elements, including lubrication bearings, and gearings. Introduction to advanced analysis techniques. Gear geometry, force, and nomenclature. Traditional and planetary gear trains. Design of spur, helical, bevel and work gears. Rollers, ball and journal bearings. Brakes, clutches, belts and chains.

 

Semester Taught: Fall 2012, Fall 2013, Fall 2014, Fall 2015

 

EML4905: Capstone Senior Design

Supervision and evaluation of capstone senior design projects

 

2016 Design of Airfoils for VAWT (E. Moore, M. Dennison, E. Gutierrez)

2015 NASA Hybrid Rocket Launch Team (M. Gonzales, G. Lombarid, C. Hayes)

2014 Nanoindenter Force Converting Stage (P. Wong, J. Carbillo, E. Camacho)

2014 Pneumatic Torque Wrench (R. Lucia, M. Hildago, L. Cruz)

2014 Hanford Tank Inspection Device (G. Vazquez, D. Giraldo, J. Arenilla)

2014 GLOBAL Bike (X. Prugue, R. Ruyani, J. Goolcharan)

2014 Sub Automatic (C. Bonilla, O. Tavares, D. Peija)

2013 Prototype Magnetic Refrigerator (M. Lizano, F. Iriarte, E. Garcia)

2013 Adjustable Spinal Cage (P. Medrono, C. Dominguez, J. Crisp)

2013 Material Selection Mechanism (H. Garcia, J. Rocha, M. Mohamadapour)

2013 Highway Wind Capture Device (B. Champagnie, A. Simonis, G. Altenor)