Lecture 4: Structure and Mechanical Properties of Materials
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Lecture 4: Structure and Mechanical Properties of Materials
Introduction to Material Properties. • New Focus on: – Fundamental information
on the bulk properties of biomaterials. – Basic level to enable understanding of.
Structure and Mechanical Properties of Materials
Introduction to Material Properties • New Focus on: – Fundamental information on the bulk properties of biomaterials – Basic level to enable understanding of metallic, polymeric, and ceramic substrates
• In the next few classes we will cover: – Crystal structure – Stress-strain behavior – Creep, fracture, fatigue, and wear of materials
The 14 Bravais Lattices
Solidification of a Polycrystalline Material
Grain Boundaries
The Three Common Types of Materials
Introduction to Carbon Polymers
The unit at the base of Carbon Chains
3-D Representation of a chain of single bonded carbons
Carbon chains can only rotates in specific ways
Introduction to Carbon Polymers
Branching in Polymers
Cross-Linking in Polymers
Multy-Component Polymers
Multi-Component Polymers
Mechanical Properties of Materials
Fundamentals of Elastic Behavior
Basic Types of Loading and Deformations
Definition of Stress Tensile Stress
Shear Stress
Definition of Stress
Definition of Strain Tensile Strain Lateral Strain
Shear Strain
Definition of Strain
Poisson’s Ratio The stress-strain curve does not show an important feature of plastic deformation: -A contraction perpendicular to the extension caused by a tensile stress
Definitions of Elastic Constants
Basic Definition of Tensile Properties
Tensile Properties and Their Measurement
Young’s Modulus over Density
Strength over Density
Non-Linear Deformation of Lumbar Vertebra
Non-Linear Deformation of Lumbar Vertebra Ultimate load under Tension/Compression
Stresses on Bone Under Different Types of Loading
Stresses on Bone Under Different Types of Loading Principal Stresses and Ski Injury in Tibia due to Torque
Mechanical Properties of Tissue
Plasticity of Tissue
Sub-Failure Injury
Material Properties of Biological/Implant Materials
Basic Definition of Toughness
Summary and Concluding Remarks • This class presents an introduction to the structure and properties of materials • A simple introduction to amorphous and crystalline structure was presented • This was followed by some basic definitions of stress, strain & mechanical properties • The mechanical properties of soft and hard tissue were then introduced • Balance of mechanical properties is key for design
