What are time dependent mechanical properties?
What are time dependent mechanical properties?
Time-dependent mechanical properties of fibres, such as stress relaxation, creep and creep recovery, have also been the subject of interest. These properties are important, as they would reflect the textile material’s behaviour during processing and actual use, particularly the dimensional stability and resiliency.
What are the mechanical properties of bones?
1.3. 2. Mechanical properties of compact bone
| Property | Modal valuea | Lower limitc |
|---|---|---|
| Tensile strength | 150 MPa | 15 MPa Ear bones, densirostris |
| Ultimate tensile strain | 0.03 | 0.002 Ear bones |
| Compressive strength | 250 MPa | |
| Bending strength | 250 MPa | 30 MPa Ear bone |
What is the modulus of bone?
Typically, the modulus of human trabecular bone ranges between 10 and 3,000 MPa, whereas strength, which is linearly and strongly correlated with modulus (82, 89), is generally two orders of magnitude smaller, in the range 0.1–30 MPa.
Are bones anisotropic?
Anisotropic Characteristics Bone tissue -Is an anisotropic material, indicating that the bone behavior will change depending on the direction of the load application. In general, the bone tissue may lead to higher loads in the longitudinal direction and a lesser quantity of load when applied over the bone surface.
What are the time dependent properties of materials explain briefly?
The time dependency of materials is an inherent property of their structure, which further depends on the initial kinetics and applied thermomechanical boundary conditions. Therefore, material structure depends on its thermal properties, which are generally measured through differential scanning calorimetry.
What is time dependent strain?
Time-dependent strain under constant stress is known as creep. Creep is one of the principal properties which are of prime importance in developing and using composite materials.
What are the structural properties of bone?
Bone is a biologically generated composite material comprised of two major structural components: crystals of apatite and collagen fibrils. Computational analysis of the mechanical properties of bone must make assumptions about the geometric and topological relationships between these components.
Is bone brittle or ductile?
It is well accepted that bone is a semi-brittle material with an ability to exhibit plasticity and ductility when the circumstances allow it, whereby either the loading environment (applied strain rates) or the ambient conditions (humidity/dryness) define the degree of its ductility.
Are bones elastic or plastic?
Bone mineral is a ceramic material and exhibits normal Hookean elastic behaviour, i.e. a linear stress-strain relationship. In contrast, collagen is a polymer that exhibits a J-shaped stress-strain curve. (See the TLP Elasticity in Biological Materials.
What is the compressive strength of bone?
Since these materials are conceived as bone substitutes, it is important to keep in mind as reference values that the compressive strength of human cortical bone ranges between 90 and 209 MPa,156, 157 and that of the cancellous bone between 1.5 and 45 MPa.
Is metal stronger than bone?
Bone is extraordinarily strong — ounce for ounce, bone is stronger than steel, since a bar of steel of comparable size would weigh four or five times as much. A cubic inch of bone can in principle bear a load of 19,000 lbs.
Why are the mechanical properties of bone important?
The mechanical properties of bone are fundamental to the ability of our skeletons to support movement and to provide protection to our vital organs. As such, deterioration in mechanical behavior with aging and/or diseases such as osteoporosis and diabetes can have profound consequences for individuals’ quality of life.
What is the stress–strain response of cortical bone?
When loaded in tension along the longitudinal direction, cortical bone exhibits a bilinear stress–strain response in which a distinct yield point separates a linearly elastic region and a region of linear hardening that ends abruptly at a fracture strain of less than 3% (Figure 1a). Open in a separate window Figure 1
What is the difference between cortical bone and trabecular bone?
The distinction between these two types of bone tissue can be made largely on the basis of porosity: Cortical bone has a porosity of 5% to 15%, whereas the porosity of trabecular bone ranges from 40% to 95%.
Does bone tissue have a reloading modulus?
Both types of bone tissue exhibit a reloading modulus that is initially equal to the original Young’s modulus but then decreases to equal the perfect damage modulus. Modified from References 3and 80with permission.
