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ES 240

Matt Pharr's picture

Matt Pharr's First Post

My name is Matt Pharr, and I am a first year graduate student at Harvard in the School of Engineering and Applied Sciences.  I am working with Dr. Zhigang Suo's research group http://www.seas.harvard.edu/suo/ .  My concentration is in solid mechanics, so ES 240 is obviously fundamentally important to my future research.  One of my main goals in this class is to build a solid foundation in solid mechanics.  More specifically, I want to be able to better analyze problems and understand equations in terms of their physical meaning.

My first entry

Hello,

My name is Pawel and I am a Junior in Harvard College, studying Mechanical and Materials Science and Engineering.

The only course in solid mechanics I've taken so far is the Harvard's undergraduate intro course ES 120 - I guess it's similar to intro courses offered at other universities. Bits and pieces of solid mechanics also appeared in some other courses, but mostly in a very basic form.

Kejie Zhao's picture

Kejie Zhao

Hi everyone, very glad to see you here. My name is Kejie Zhao, a first year phd student working in Prof.Zhigang Suo's group (www.seas.harvard.edu/suo). My concentration is solid mechanics with the same name of this course, it also signifies its importance to my future research. I graduate from Xi'an Jiaotong University in China before coming to Harvard. There I obtained my bachelor and master degree in Engineering Mechanics and Solid Mechanics respectively.

Sung Hoon Kang's picture

ES 240 Homework 6

Hello.

My name is Sung Hoon Kang and I am a second year graduate student of Applied Physics. I did my undergraduate study in Materials Sciene and Engineering at Seoul National University, Korea.

Final Project

This is my final project.

Final project for ES 240

This is the pdf file for the final project given by Andew and Lei.

Alex Epstein's picture

ES 240 Final Presentation--Alex and Alison

I am attaching a PDF of Alex and Alison's final presentation for ES 240.  The topic is "Arterial Compliance and Disease."

-Alex

ES 240 Final Project

Here is the powerpoint of the final project, presented by Stevie Steiner and myself.

Fall 2007 ES 240 Final Project "Viscous Deformation of a Fused Quartz Tube" by Sunny Wicks and Stephen Steiner

Attached is a PDF version of the PowerPoint presentation from our final project, titled "Viscous Deformation of a Quartz Tube Caused by Furnace Malfunction:  Analysis and Modeling".

Nanshu Lu's picture

ES 240 (Fall 2007) Homework 37-40

This is the last problem set this semester. It is due on Friday, Dec. 14, 2007.

Andrew Seagraves's picture

ES 240, Problem 29, Project Description

Lei and I will be working on developing the appropriate relations and numerical methods for topological optimization of  2D ideal structures.  In this constraint-based optimization study we will try to determine the density distribution which minimizes the strain energy for a fixed volume of material.  This problem is a subset of the so-called "G-closure" problem in topological optimization where we have restricted our possible configurations to certain ideal geometries.   

ES 240 Problem 29, project description

Andrew and I decided to work on some design topics.

Given a reference domain, some boundary conditions and a limited amount of material, which can not fill the whole domain, we want to determine the material distribution inside the domain so that the structure generated will contain the minimum elastic energy. This is called minimum compliance problem, a topic in the field of topology optimization.

Problem 29: Project

Nathan Thielen and I will be investigating straight beams, bent beams and how the analysis can be applied to hooks. We did not have much time to investigate beams in ES240 this term so we hope to gain a broader understanding of this area and share our findings with the rest of the class. The primary goal is to compare the analysis necessary for straight beams versus the analysis needed for bent beams. We choose the project because we also will have ample opportunity to investigate bent beams and hooks using FEM.

Final Project - Bent Beams

Christian and I thought comparing the theory of bent beams to that of straight beams would be interesting because we only explored straight beams this semester in class. Bent beams are important since they are encountered regularly in practice, for example a hook. The geometry of a bent beam changes the equations governing the behavior. So, understanding how the geometry changes the beams behavior is our primary interest.

Sun Min Jung's picture

ES 240 Project Proposal - Jane Yoon, Sun Min Jung

Stress/Strain Analysis of Bullet-Holeson the Boeing 737 Fuselage Boeing 737 is the most popular aircraft in the sky today, with each one taking off or landing on average of every 6 seconds.

When Quartz Tubes Start to Melt, or, Why the CVD Furnace Was Down for Four Weeks: Problem 29


Overview.
  This post is a description of the project Sunny Wicks and I will be pursuing for this class, to satisfy the requirements for Problem 29.

ES 240 Problem Set #8, Problem #20 - Green's function of biharmonic operator is not positive definite

Professor Vlassak mentioned that last year every single person did a finite element project.  He said he wanted to see more theory projects, so I decided to take him up on that.

I was browsing around one day and happened upon an article that explained that while the Green's function of the laplacian was positive definite, the biharmonic operator's Green's function is not.  Physically, this has significance. 

ES 240 Problem Set #8, Problem #20 - Project Description

I work in the Microrobotics lab here at Harvard, where we focus on the construction of biomimetic insect-sized microrobots. Traditional machining techniques are insufficient to create parts on this small scale, so we utlize laser-machined composite materials (such as carbon fiber), which are relatively rigid, and thin polymer films, which are relatively flexible. These materials can be sandwiched together in sheets to create compliant flexure joints, analagous to macro-scale revolute joints.

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