Spring 2007

This is the last homework set for ES 242r / ENGM 940

Update on 23 May 2009:  I'm adding links to the slides as they are uploaded.

The final exam will take the form of a pedagogical workshop. We have 8 students taking the class for credit. I have divided the lecture notes into 8 parts as follows.

A very breif introduction to aspects of dynamic fracture mechanics.

An overview of several approaches to computational fracture mechanics for ductile structural metals.

In this lecture I'll describe a recent PhD Thesis by Zhen Zhang.

• What types of PDEs can be solved using complex variable methods
• Anti-plane shear
• Elements of a function of a complex variable (contour integral, analytic continuation, conformal mapping)
• Line force
• Screw dislocation
• Crack
• Circular hole
• Elliptic hole
• Plemelj formulas
• Riemann-Hilbert problem
• Crack interacting with a point singularity
• In-plane deformation
• Dundurs parameters
• Interfacial cracks
• Anisotropic materials. Stroh formalism

• Slides are attached.
• Reading material: Section 4 of Z. Suo, " Reliability of interconnect structures." pp. 265-324 in Volume 8: Interfacial and Nanoscale Failure (W.
  

This set is related to buckle-driven delamination, crack bridging, and interfacial cracks.

Matrix cracking in composites and the competition between penetration and deflection when a crack approaches an interface, and the competition between advance in the interface and kinking out of the interface for an interface crack.

Hi, I'm a Physics grad student working with Dr. Ellen Williams. My job is basically making nanoelectronic devices, measuring their characteristics and trying to understand the underlying "Physics".

What I want to gain from this course is to come to know how flexible macroelectronics are approached and researched. An increasing trend of "thin" applications poses new challenges in terms of low power usage and durability.

My name is Daniel Min.  I am a senior mechanical engineering student at the University of Maryland.  I am currently enrolled in Dr. Teng Li's flexible macroelectronics course.  I chose to enrol

G. Bao and Z. Suo, " Remarks on crack-bridging concepts," Applied Mechanics Review. 45, 355-366 (1992).

My name is Kurt Vargas. I am an international student from Costa Rica, currently attending the University of Maryland at College Park. I am a Christian who loves the Lord and serves Him full time. I also love reading my Bible!

My name is Adam Rutherford and I am currently a senior mechanical engineering student at the University of Maryland. I am enrolled in Dr. Teng Li's class on flexible macroelectronics. I chose this course out of the selection of electives because I feel that flexible macroelectronics will have a large impact on the consumer electronics industry in the near future.

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My name is Josh Crone and I am an undergraduate student in Mechanical Engineering at the University of Maryland. I am in the BS/MS program with a focus in mechanics and materials. My current research interests are in atomic force microscopy.

My name is Nathan and I am a Masters student in my second year at the University of Maryland, College Park studying mechanical engineering.  I was born and raised in Erie, PA.  For my undergraduate studies, I attended the University of Pittsburgh in Pittsburgh, PA where I also studied mechanical engineering.  When I am not engineering, I enjoy running, playing the piano, and following the stock market. 

My name is Dan Forrest and I am currently a biological resources engineering student at the University of Maryland. I am taking ENME489X: Flexible Macroelectronics to fulfill a degree requirement. However, I chose this specific class because the topic in general seemed interesting to me and appears to be an up and coming field in the electronics industry.

My name is Anand Pillarisetti. I am a graduate research assistant at University of Maryland, working towards my doctoral degree in mechanical engineering. I received Master of Science (MS) degree in mechanical engineering and mechanics from Drexel University, Philadelphia, PA and Bachelor of Technology (B-Tech) degree in mechanical engineering from National Institute of Technology (NIT), Warangal, India.  I am currently enrolled in the course "Flexible Macroelectronics" taught by Dr. Teng Li at University of Maryland.

My name is Hongbo Bi and I am a Ph.D candidate in Mechanical Engineering under Dr. Bongtae Han at the University of Maryland, College Park. I recieved Master of Science (M.S.) degree in Mechanical Engineering from University of Maryland, College Park and and Bachelor of Engineering (B.E.) in Automatic Control from University of Science and Technology of China. I am currently entrolled into class of Flexible Macroelectronics (ENME808H) at the University of Maryland, which is taught by Prof. Teng Li.

My name is Christi Ryon. I am a senior undergraduate mechanical engineering student at the University of Maryland, College Park. I am taking a course in flexible macroelectronics for two reasons. First, this course fulfils a major requirement. The second reason is that the subject of flexible macroelectronics is a new emerging technology that I was not familiar with but is a topic that I wished to learn more about.

My name is Ben Marshall and I am an undergraduate mechanical engineering student at the University of Maryland. I am currently enrolled into a flexible macroelectronics class at the University of Maryland, taught by Dr. Teng Li. I gained interest in this class through a guess lecture Dr. Li gave in one of my classes. Flexible macroelectronics seems to be a growing area in electronics and I have always been interested in plasma and flat panel screen technology.

Farbod was born on a rainy day. Long before his birth, fortunetellers predicted that a child would be born and make a significant change in the world in the future. Farbod was born on NOV 3, 1982. His dad taught him swimming at a very early age. At the age of 11, Farbod began his competitive swimming and joined different teams. He was one of the fastest state champions when he was 14. He has placed second and third in 4 x 100 meter freestyle. Farbod retired himself from swimming in high school to persue his ultimate goal as an enginner.