Blog posts

How safe are metal-on-metal hip implants? and are ceramic-on-ceramic safer? Or we will discover soon they are not?

Submitted by Mike Ciavarella on Sun, 09/29/2013 - 22:49

Would you believe this story?

To me, that metal - on - metal had large friction, especially with the newest designs, it was clear from the old Sir Charnley studies in Leeds in 1950s published in his gold book.

Anyway, when I looked at ceramic on ceramic joints, I also found evidence of increased friction. Maybe ceramic debris is less toxic?

Please comment. What can we do outside USA to improve the situation?

Michele Ciavarella

1st International IEEE Workshop on Metrology for Aerospace. Benevento, Italy, May, 29-30, 2014.

Submitted by Mike Ciavarella on Sun, 09/29/2013 - 20:28

Dear Colleagues and Friends,

We are pleased to invite you to contribute to the 1st International IEEE Workshop on Metrology for Aerospace.

The event is co-technical sponsored by two IEEE Societies, AESS and IMS.

The event includes but is not limited to new technology for metrology-assisted production in aerospace industry, aircraft component measurement, sensors and associated signal conditioning for aerospace, calibration methods for electronic test and measurement for aerospace.

Fixation and Mechanical Properties of Implanted Cartilage Replacements - An overview of three recently published papers

Submitted by Ali_Vahdati on Sun, 09/29/2013 - 18:08

research

biomechanics

computational mechanics

finite element analysis

cohesive zone model

soft tissue mechanics

articular cartilage

biphasic theory

Partial- and
full-thickness cartilage lesions of the knee caused by trauma, disease or joint
instability are a common disorder affecting people of all ages. Implanted
cartilage replacements (ICR) have the potential to overcome the limitations of
conventional treatment methods and are a promising approach to restore
functionality of the joint. In spite of some success in engineering
cartilaginous tissue, inferior biomechanical and biochemical properties of ICR
compared to native articular cartilage (AC) and inadequate quality of fixation

how to model ply dropoffs using continuum shell in abaqus

Submitted by einsegelboot on Sun, 09/29/2013 - 10:51

software

I am trying to model ply dropoffs of composite materials ,because I am working on a contact problem of bolted joint,so I choose continuum shell rather than shell ,but it seems that the ply thickness will change at a ply dropoff region. Does anyone knows how to solve this problem?

New blog for Mechanical Engineers

Submitted by r.pochinkov on Sun, 09/29/2013 - 07:59

education

MARINE ENGINEERING

marine structures

marine propulsion plants

Dear colleagues,

Abaqus user subroutines - migrating to version 6.12

Submitted by rdgabbai on Sat, 09/28/2013 - 21:56

software

Hello,

I have a user subroutine (UEL) written in Fortran that was running correctly when I used Abaqus V6.5 (in XP) and Compaq Visual Fortran to compile. I was running as abq654 job=s00 user=abafer.for inter.