Blog posts

"Crack" versus "Fracture"

Submitted by Andrew Bunger on Fri, 10/26/2007 - 05:44

It seems that within the field of fracture mechanics, some authors use "fracture" to refer to the mechanism of creating new surfaces within a body by breaking the material bonds and reserve the word "crack" for the sharp-tipped discontinuity that results from fracture of a brittle material. But it does not appear that this distinction is followed consistently throughout the literature, and perhaps different research areas within the fracture mechanics field use the two words in different ways.

we sell tungsten and molybdenum and stainless steel products

Submitted by titech123 on Fri, 10/26/2007 - 03:50

we mainly produce stainless steel plate, stainless steel sheet, stainless steel coil plate, stainless steel tube, stainless steel pipe, stainless steel strip, stainless steel rod, bar, wire rod, stainless steel wire, welding wire and Stainless steel elbow, stainless steel fastener, stainless steel screw, stainless steel bolt, stainless steel forks, stainless steel valve; tungsten wire, white tungsten wire, tungsten rod, bar, tungsten plate, sheet, tungsten powder, tungsten tube, pipe, tungsten ring and tungsten alloy ring, tungsten axes and tungsten alloy axes, tungsten crucible, tungsten b

ES 240 (Fall 2007) Homework 22-25

Submitted by Nanshu Lu on Thu, 10/25/2007 - 18:36

This problem set is due on Nov.2, 2007.

About SIESTA MD Package

Submitted by Apurba Mandal on Thu, 10/25/2007 - 10:59

education

Is there anyboby to help me. Actually I am facing some problem during the use of SIESTA (Spanish Initiative for Electronic Simulations with Thousands of Atoms) package. The problem is that How to generate the Pseudopotential file. And the use of Vibra utility. During the use of Vibra package i cant able to run it properly.

Questions on ferroelectrics: why tetragonal ferroelectric ceramics are difficult to pole while rhombohedral ceramics easy to?

Submitted by Faxin Li on Thu, 10/25/2007 - 08:40

research

It may be well known to researchers on ferroelectrics that tetragonal ferroelectric ceramics, such as BaTiO₃, Ti-rich lead titanate zirconate (PZT), are difficult to pole even using a high DC field with long holding time. While the rhombohedral PZT or PZT near the morphotropic phase boundary (MPB) are easy to pole, especially the latter. Why?

modeling of flexible four-bar mechanisms

Submitted by mullapudi datt… on Thu, 10/25/2007 - 07:13

hi,

can any body tell me about the modeling of flexible four-bar mechanisms?

15. Recommend a textbook that you think will help students in this course

Submitted by mingguo on Thu, 10/25/2007 - 02:13

Theory of Elasticity by Landau and Lifshitz.

http://www.amazon.com/Theory-Elasticity-Third-Theoretical-Physics/dp/075062633X

content:

1 fundamental equations

2 the equilibrium of rods and plates

3 elastic waves

4 dislocations

5 thermal conduction and viscosity in solids

6 mechanics of liquid crystals

ES 240 - Sun Min Jung Q15

Submitted by Sun Min Jung on Thu, 10/25/2007 - 00:51

If I were to recommend one textbook that will help students in this course it would obviously be the "Theory of Elasticity" by Timoshenko and Goodier. But you could have found that out by simply looking at the course syllabus, so I will also recommend the following books that are helpful in other areas of the course: "Mathematical Phyiscs" by Kusse and Westwig, "Mechanics of Materials" by Beer and Johnson, and "Advanced Engineering Mathematics" by Greenberg.