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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
research
hip implants

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 

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

Submitted by Ali_Vahdati on
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

defining a response spectrum in abaqus 6.10

Submitted by Lekshmi Dinachandran on
research
ABAQUS/CAE
abaqus keywords
response spectrum

Hi,

I am trying to perform a response spectrum analysis of a tall tower. I work with abaqus 6.10, but i am unsure of how to define a spectrum. there is no spectrum radio button on the create amplitude menu... so i guess i have to edit the keywords.

does anyone have an example of how a spectrum can be defined? i'd be much grateful

Regards,

Lekshmi Remesh 

Energy formulations of nonlinear elasticity including electric / magnetic couplings

Submitted by liuliping on
research
Nonlinear elasticity
energy formulation
electric coupling
magnetic coupling

Equilibrium theories for a continuum body may be formulated by either of the
following the classic paradigms: (1) We begin with the stress postulation (Cauchy’s formulation) and write down the kinematics, conservation laws, and
constitutive relations. In this way, one can obtain a system of field equations
which, presumably, can be solved upon specifying boundary conditions and
determine the equilibrium state of the body. (2) A second way is to start from
the energy postulation (Green’s

Ansys- Composite materials

Submitted by Manohar Reddy Y P on
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validation of ANSYS composite Prepost (ACP)

Hi all,

Iam presently using Ansys Composite Prepost (ACP) for composite material modelling. I looked at some tutorials and understood the procedure, but when I applied it to simple case of simply supported rectangular plate with uniform load, the results donot match the theoritical textbook results. I tried it in ANSYS Mechanical APDL, the results were exactly same with  theoritical value. Iam unable to find the mistake. Is it possible to get the validation results for ACP similar to the validation results which are available for ANSYS APDL(provided by ANSYS ).

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