Publications by authors named "Wayne Falk"
Article Synopsis
- - Nitinol components in medical devices often face fatigue fractures due to small cracks starting at non-metallic inclusions before traditional crack growth occurs; understanding these cracks is essential for assessing device durability.
- - The study involved rotary bend fatigue tests on nitinol wire up to 2 billion cycles, measuring crack initiation from inclusions and calculating the stress intensity threshold.
- - The researchers propose that a smooth feature surrounding inclusions, observable under a scanning electron microscope, indicates ongoing crack growth, leading to a damage curve that helps predict the maximum allowable defect size for design life and loading conditions.
Elasticity theory for self-assembled protein lattices with application to the martensitic phase transition in bacteriophage T4 tail sheath.
Phys Rev E Stat Nonlin Soft Matter Phys
January 2006
We propose an elasticity theory for one- and two-dimensional arrays of globular proteins for which the free energy is affected by relative position and relative rotation between neighboring molecules. The kinematics of such assemblies is described, the conditions of compatibility are found, a form of the free energy is given, and formulas for applied forces and moments are developed. It is shown that fully relaxed states of sheets consist of helically deformed sheets which themselves are composed of helical chains of molecules in rational directions.
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