Skip to main content

research

Contact radius of sphere

Submitted by ColinGrant on
Forums
Ask iMechanica
Choose a channel featured in the header of iMechanica
research

Looking through books and papers I see an often quoted equation to show that the contact radius (a) of spherical indenter of radius (R) is related to the indentation depth (h):

a= √(R.h)

However, using simple trigonometry of a spherical cap it can be shown that:

a=√(2Rh-h2)

Contact area is very important for use in nanoindentation - however, if it is based on the wrong contact area calculation, then more errors become apparent.

Contact radius of spherical indenter

Submitted by ColinGrant on
research

Looking through books and papers I see an often quoted equation to show that the contact radius (a) of spherical indenter of radius (R) is related to the indentation depth (h):

a= √(R.h)

However, using simple trigonometry of a spherical cap it can be shown that:

a=√(2Rh-h2)

Contact area is very important for use in nanoindentation - however, if it is based on the wrong contact area calculation, then more errors become apparent.

Research Leader and Manager, Carbon Resource Management Department

Submitted by Vanessa Van Dyk on
research
petroleum Co2 sequestration
enhanced oil recovery
unconventional fossil energy

Idaho National Laboratory Research Leader and Manager, Carbon Resource Management Department The Idaho National Laboratory (INL) is seeking a highly qualified individual to lead its Carbon Resource Management Department, which is a component of the Energy Systems and Technologies Division of the INL Energy and Environmental Science and Technology Directorate.

Woven composite 2x2 twill using XFEM

Submitted by anuragdixitiitd on
Forums
Ask iMechanica
Choose a channel featured in the header of iMechanica
research

Hi everybody,

I am anurag working on damage mechanics of 2x2 twill woven composite, i will conduct the carbon/epoxy laminates under various regimes of service loas (quasi static  loading, low velocity impact, fatugue, post impact) and will also model crack propogation of the same using XFEM.I have studied FEM at graduate level.

Initially i will calculate mechanical properties of woven composite using unit cell method by applying homogenization process.

Electro-creasing instability in deformed polymers: experiment and theory

Submitted by Qiming Wang on
research
electromechanical instability
dielectrics
electro-creasing instability
pattern formation
SAMs Lab research

Electro-creasing instability in deformed polymers: experiment and theory

Qiming Wang, Mukarram Tahir, Lin Zhang, and Xuanhe Zhao*

Soft Matter, In Press 

The Results of The 1st Y.C. Fung Student Paper Competition on Biomechanics, Biophysics, and Biomatreriomics

Submitted by shaofanli on
research

The final phase of  The 1st Y.C. Fung Student Paper Competition on Biomechanics, Biophysics, and Biomatreriomics was held at Northeastern University, Boston, on June 3rd, 2011.

Seven finalists have participated the oral presentation, and they are:

                   Egor Dontsov from the University of  Minnesota,

Universal Stability and Temperature Dependent Phase Transformation in Group VIIIB–IB Transition Metal FCC Nanowires.

Submitted by Vijay Kumar Sutrakar on
research

I want to share our recent research work on FCC metallic nanowires, which is published in Journal of Physical Chemistry - C (ACS Publications). The abstract of the paper is given below. Further details can be found at " Sutrakar et al  J. Phys. Chem. C, 2011, 115 (21), pp 10394–10398

DOI: 10.1021/jp2006815

 

HOW IS THE STRESS AND STRAIN DISTRIBUTION NEAR THE FATIGUE CRACK TIP ?

Submitted by Chen Long on
research

Dear friend:

            As known to all, the magnitude of the stress/strain at the crack tip is  mathematically infinite,while it is physically finite. So,what i am concerned is how to caculate the value of the stress/strain at the tip.What's more, i doubt that  whether the CTOD is constant during the propogation process.if yes.so can i take a constant range of the limited stress/strain near the crack tip? If there is any reply ,i will be appreciated!

Subscribe to research