Akademik Veri Yönetim Sistemi
8th International Conference on MATERIALS SCIENCE & ENGINEERING, Paris, Fransa, 21 - 22 Eylül 2023, ss.1
Background: So far, artificial composite production routes have been unable to replicate the ductility-
strength balance exhibited by biological entities. A multi-scaled approach should be pursued to
achieve the mechanical properties observed in biological systems. The natural world employs a combination
of diverse length scales, including macro, micro, and nano-scales, to maintain an optimal balance
of various mechanical properties such as strength and toughness. A notable example is the hierarchical
structure of human bones, which consists of seven levels ranging from nanometers to centimeters. The
remarkable aspect of this hierarchical arrangement is that the multi-scaled reinforcements maintain
strength and toughness.
Objective: To achieve the ductility-strength balance of the biological systems.
Methods: The study presents a two-component nanocomposite system, which involves the production
of a macro-scaled biocompatible nanocomposite followed by constructing a micro-scaled nanocomposite
coating with spatially gradient particle distribution on top of it. This composite design imitates the
spatially graded composites found in biological systems that join mechanically distinct entities, such as
bone and cartilage, to produce an incremental change in elastic modulus, preventing stress concentration.
Results: Through mechanical analysis of the gradient coating, it was found that particle concentration
arrangement resulted in an incremental elastic modulus change from the level of polymeric materials
near the bottom to the level of metals/ceramics towards the top of the films leading to 2 orders of magnitude
gradient elastic modulus change.
Conclusion: The macro-component of the multi-scaled composite remained ductile, while the micro-
component surface of it exhibited superior hardness and stiffness, protecting the interiors.