chap 9: mechanical properties of biological tissues
DESCRIPTION
Chap 9: Mechanical Properties of Biological Tissues. Elastic Materials. = E . Reversible in the elastic range and generally n ot dependent on time. Most engineering materials w e stay in this elastic region. Nonlinear Elasticity. Hookean Elasticity. “Rubber Band”. Pseudoelasticity. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/1.jpg)
Chap 9: Mechanical Properties of Biological Tissues
Elastic Materials
= E
Reversible in the elastic range and generallynot dependent on time. Most engineering materialswe stay in this elastic region.
![Page 2: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/2.jpg)
Nonlinear Elasticity
“Rubber Band”
Hookean Elasticity
![Page 3: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/3.jpg)
Pseudoelasticity
Hysteresis
![Page 4: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/4.jpg)
Definitions involving Viscoelasticity
Stress relaxation – when a body is suddenly strained (deformed) and then thestrain is maintained constant, the corresponding stresses induced inthe body decrease with time
Creep – if the body is suddenly stressed (loaded) and the stress (load) is maintainedconstant afterward, the body continues to deform with time
Hysteresis – cyclic loading gives a situation wherein the loading and unloading processesare somewhat different, pseudoelastic
![Page 5: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/5.jpg)
Creep Under Constant Loading
![Page 6: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/6.jpg)
Relaxation under Constant Deformation
![Page 7: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/7.jpg)
Models of Viscoelasticity
These models comprise a spring (elastic) with a dashpot (viscous) wheremis the Hookean spring constant and is the viscosity.
Spring gives an instantaneous deformation proportional to the load (F), whereasthe dashpot provides a velocity proportional to the current velocity.
![Page 8: Chap 9: Mechanical Properties of Biological Tissues](https://reader033.vdocuments.mx/reader033/viewer/2022061514/5681649b550346895dd67a71/html5/thumbnails/8.jpg)