Tissue Biomechanics 2 Flashcards Preview

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Flashcards in Tissue Biomechanics 2 Deck (31):
1

The total energy required to cause material FAILURE.

toughness

2

How can toughness be estimated on the stress/strain curve?

By observing the TOTAL AREA under the stress strain curve.

3

Describe bone in strength, ductility, and toughness:

High strength
Low ductility (brittle)
Low toughness

4

Describe a tendon in strength, ductility, and toughness.

Moderate strength and ductility
High toughness

5

Describe a ligament in strength, ductility, and toughness:

Low strength, high ductility,
Moderate toughness

6

The ability to return to original shape when the load is removed:

elasticity

7

The point at which the applied stress can lead to PERMANENT DEFORMATION:

Yield point

8

The nonlinear response of the material after the yield point - some degree of deformation will persist after removal of stress:

Plastic region

9

In the plastic region, will the material return to normal shape?

no

10

Property of materials to resist loads that produce shear or tensile forces:

viscosity

11

What refers to putty like behavior? (The linear deformation produced by tensile stress remains after the stress is removed:

Viscous (plastic) stretch

12

The majority of body tissues are this:

viscoelastic

13

When a material shows both viscosity AND elasticity:

viscoelasticity

14

Viscoelastic structures will show ______ dependent loading characteristics:

time

15

What are the three time dependent loading characteristics of viscoelasticity?

creep
Relaxation
hysteresis

16

Continued deformation over time when constantly loaded.

creep

17

The corresponding eventual decrease in stress that will occur as fluid is NO long exuded:

relaxation

18

Energy loss exhibited by Viscoelastic material when they are subjected to loading and unloading cycles:

hysteresis

19

Creep in tissues occurs because of what?

Expulsion of water (IVDs)

20

The larger the load, the ______ the hysteresis.

greater

21

The part of the graph for normal range of motion:

Toe region

22

This region of the graph is after taking out the slack in soft tissue:

Micro-failure

23

Is it still elastic in the micro-failure region of the graph?

yes

24

A grade one strain and small amount of damage happen in this region of the graph:

micro-failure

25

The stress when plastic deformation starts:

Yield stress

26

Magnitude of stress on the load--deformation curve at which appreciable deformation takes place without any appreciable increase in load:

Yield stress

27

The tissue undergoes PLASTIC deformation, grade 2 sprain:

Macro-failure

28

Eventually the tissue ruptures, what grade sprain is this?

Grade 3 sprain

29

Are you looking at the graph for loading characteristics? In order how does it go?

No, then look
Toe region
Micro-failure,
Yield point,
Macro-failure (plastic)
rupture

30

Toe region is also known as the:

Clinical region

31

Slack or crimp removed in this region:

Toe region