ES 242r

I am Namiko Yamamoto, a 1st year PhD student in Aero/Astro department at MIT. I have been Aero/Astro major for both my BS and MS at MIT, also. I have taken ES240 (solid mechanics) with Prof. Suo this past fall, and have taken one solid mechanics class (2.071) at MIT. This is my first time learning about fracture mechanics. My weakness is that I don't know the material well, and even now I need to spend good time to understand the materials given in the lecture (notes and lectures are so helpful). My strength will be my motivation to learn the materials. It has been much fun in the class, and this learning will help me much in my research. For my PhD, I will be studying how to strengthen structural composites with carbon nanotubes (CNTs) under Professor Brian Wardle. In the current design, we will be investigating delamination fractures between prepregs. This class will be so helpful for this research, and further since I want to continue studying in materials/structure field beyong PhD.

Hi, I am Roberto Soares and I am a PhD student in Engineering Mechanics at UNL. My undergrad is from Brazil in Civil Engineering (Federal University of Ceara) and my Master’s in Engineering Mechanics from UNL. In the past I had the chance to take Continuum Mechanics, Adv Mechanics of Materials, FEM and several courses in Materials.

Hi everyone. My name is Michael Mahoney and I'm currently enrolled in the fracture mechanics course at the University of Nebraska. I am pursuing my master's degree in engineering mechanics. My advisor is Dr. Joseph A. Turner and my research is in acoustoelastic methods for characterizing stress in a material. Here is a link to our research group:  http://em-jaturner.unl.edu/.

I am currently enrolled at University of Nebraska-Lincoln. The main courses I've taken in Solid Mechanics are Continuum Mechanics and Advanced Finite Element Method (currently taking). My undergraduate and Master major is Civil Engineering, both obtained in my home country Brazil. I would say that my strength related to this course is my motivation to understand the complex physical process of cracking, and my weakness is probably the fact that I don't have a good background in Fracture Mechanics. I am curretly pursuing my PhD at UNL under supervision of Dr. David Allen. Unfortunately our group doesn't have a published website. I am currently working on the development of a multi-scale computational model for predicting the evolution of damage in composites subject to impact loading. So, a better understanding of fracture mechanics and of the physical process underlying cracking will be of major importance to my research work. Finally, as fracture mechanics is present in any engineering application, I am sure it will greatly improve my education in a general basis.

• Various cracks in thin films under tensile or compressive stresses
• Micrographs of cracks in thin films
• A micrograph of a channel crack
• The origin of stress in a film
• Stress in a thin film due to mismatch in the coefficients of thermal expansion
• Stress in film due to bending
• Measure redisual stress using wafer curvature
• Channel crack:  initiation vs. steady propagation
• Steady-state energy release rate of a channel crack
• Channel crack in patterned structure

Lecture 5

Lecture 5

Lecture 4

      I'm Francisco Thiago S. Aragao. Please call me Thiago. I'm currently enrolled at the University of Nebraska at Lincoln Civil Enginering Master's Program under the advisory of Dr. Yong-Rak Kim. I have also a minor course in Engineering Mechanics. Below I'm answering the questions from the Problem 1 of Fracture Mechanics' Assignment 1.

Lecture 3