Mech Mat Sci
Rishi Raj 

(updated April 08, 2020)


FCQs: Please complete by midnight tonight 04/27

You will neet to cut and paste the following link into your browser

Schedule of Presentations on Apr 27+29

Link to the pdf page schedule


The paper is NOT a review of a subject but rather a short description of the phenomenon and your analysis of the phenomenon. Typically you would propose a “mechanism”, and a simple model based on assumptions as needed, hopefully drawing upon the topics we have discussed in the course. For example, the increase in the fracture strength of fibers as they become thinner (referring to a paper by Griffith in 1925) can be the topic for your paper.

Final Presentation (ten minutes during class), Apr 27 (Mon) and Apr 29 (Wed)

Final paper due date May 1st (Fri)

Your paper will be typically about five pages long with

(i) a descriptive title,
(ii) a 100 word abstract, and
(iii) the main section, which is written like a letter about five pages long with a line spacing of 1.5, including figures and tables.

You will give a 10 minute presentation with about 5-10 slides in ppt to the class. More than one student can have their paper on the same Topic Area, but the titles must be distinct.

To Search for Literature:
(i) Pick a few keywords.
(ii) Go to Google Scholar and look for a book or an article that is highly cited.
(iii)Click on the article title to read its content, most often CU has free access to the journals.
(iv) If a book, then login to Chinook and search. Most often the book chapters will be available online. If you are working at home then link to the CU server via Cisco-Connect, generally known as VPN.


Topics in Elasticity

Papers Related to the Tensile Test

Theory of the Tensile Test (difficult)

Theory of Elasticity in Polycrystals (classical - two pages)

Original work on effect of size on yield srength by Brenner(recommended)

Paper Related to Cantilever Beam: Atomic Force Microscope

Using the AFM to measure the Youngs Modulus of DNA molecules(recommended)

A Map of Modulus vs Density for different classes of materials

Ashby Map of Modulus and Density (recommended)


Topics in Plasticity

Forming Limit diagrams

Pioneering work by Keeler (recommended)

Practical Applications of Forming Limit Diagrams(recommended)

Original work on effect of size on yield srength by Brenner(recommended)

Paper Related Epitaxial Growth

Thin films of Single Crystal Si, for example, can be grown on Ge single crystal even though their lattice paramters are slightly different. Misfit dislocations at the interface form to accommodate this slight difference in the lattice paramter at the interface:
Original paper by Jan H, van der Merwe (difficult to read but very interesting)

Another paper on misfit dislocations, easier to read and with experimental information

Paper Related to Porous Materials

Mechanical Properties of Aluminum Foams (recommended)


Topics in Fracture

Fracture in Thin Films and Interface Shear Stength

Original work on a simple method to measure the adhesion of thin films (recommended)

Crack Tip Opening Displacements

Fracture of a Craze Original work (recommended)

Fracture of a Craze Original work -- 2 (recommended)

Local Yielding in a metal(highly recommended)

Porous Materials

A nice paper on fracture in porous structures(recommended)

A nice paper on Cellular Solids

Indentation Experiments and Theory

Measuring Fracure Toughness with Indents (recommended)

Measuring Fracure Toughness with Indents-2 (recommended)

Griffiths Classical Theory of Fracture

Original Work Worth Reading (recommended)

Plot of strength vs fiber diameter from Griffith (recommended)

Sub-Critical Crack Growth

Original work on slow crack in class in humid environments (recommended)

Elegant Experiments on the Effect of Molecule Size on Corrosion Behavior (recommended)

Statistical Analysis by Weibull

An early paper on Weibull analysis (recommended)

A nice tutorial on Weibull analysis of data and its significance (recommended)


Deformation and Fracture at High Temperatures

Diffusional Creep

Phenomenological Description of Creep in Polycrystalline materials (recommended)

A Model for Diffusional Creep (recommended)

Deformation Mechanism Maps

Deformation Mechanism Maps (recommended)

This link will take you to Dartmouth where a book on Deformation mechanism maps by H. J. Frost is publishedttps/

Liquid Phase at Grain Boundaries

Influence of Liquid Phase on diffusional Creep (recommended)

Nucleation and Growth of Voids at Grain Boundaries

A Model for Diffusional Fracture (recommended)

Sintering of Powders into Dense Bodies

Original paper on theory of sintgering of glass (recommended)

Mechanisms of Sineering of Polycrystalline Powders (recommended)

Internal Friction

Theory and Experiments in Internal Friction (good reading)


Collection of Plots Showing the Relationship between Enthalpy of bonds and Elastic Properties

Here is the collection (good reading)


Guidance for Papers and Presentations

Format for the Written Paper

Two options for the paper format

10 Minute Presentation

Guide for the Slide presentation

Two Examples of Written Papers

Elastic Properties and the Periodic Table

Dislocation Pinning and the Yield Stress