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Questions and Answers
What is the region where stress and strain are linearly related known as?
What is the region where stress and strain are linearly related known as?
Which type of stress is predominant in the outer portion of long bones?
Which type of stress is predominant in the outer portion of long bones?
In bending, which side of the object becomes concave, indicating it is under compression?
In bending, which side of the object becomes concave, indicating it is under compression?
What happens to the shape of an object when a bending moment is applied?
What happens to the shape of an object when a bending moment is applied?
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Where are the highest tensile and compressive stresses located in a bent object?
Where are the highest tensile and compressive stresses located in a bent object?
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Which type of bending typically results in failure at the middle of an object?
Which type of bending typically results in failure at the middle of an object?
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What determines the amount of bending in an object subjected to a bending moment?
What determines the amount of bending in an object subjected to a bending moment?
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Which type of stress occurs in cantilever bending when a compressive force acts off-center from the long axis?
Which type of stress occurs in cantilever bending when a compressive force acts off-center from the long axis?
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What type of stress arises on an object's outer surfaces when it bends?
What type of stress arises on an object's outer surfaces when it bends?
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What is the unstressed region between the concave and convex sides of a bent object known as?
What is the unstressed region between the concave and convex sides of a bent object known as?
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What is the primary concern in the field of tissue mechanics?
What is the primary concern in the field of tissue mechanics?
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Which of the following is NOT a general property of tissue that is studied in tissue mechanics?
Which of the following is NOT a general property of tissue that is studied in tissue mechanics?
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Which of the following is NOT a characteristic of biological materials?
Which of the following is NOT a characteristic of biological materials?
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According to the quote from Hippocrates, what is the importance of using and exercising the body's parts?
According to the quote from Hippocrates, what is the importance of using and exercising the body's parts?
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What is the significance of understanding the structure and geometry of tissues in tissue mechanics?
What is the significance of understanding the structure and geometry of tissues in tissue mechanics?
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What property of a material allows it to absorb energy during plastic deformation before failure?
What property of a material allows it to absorb energy during plastic deformation before failure?
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Which of the following is NOT a potential application of tissue mechanics knowledge?
Which of the following is NOT a potential application of tissue mechanics knowledge?
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The $ extbf{rate of loading}$ on a biological material affects its:
The $ extbf{rate of loading}$ on a biological material affects its:
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Which of the following is a measure of the energy absorbed by a material and returned when the load is removed?
Which of the following is a measure of the energy absorbed by a material and returned when the load is removed?
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The $ extbf{fluid component}$ in biological tissue provides:
The $ extbf{fluid component}$ in biological tissue provides:
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Which of the following best describes the behavior of a ductile material when subjected to increasing strain?
Which of the following best describes the behavior of a ductile material when subjected to increasing strain?
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What is the primary cause of fatigue failure in materials subjected to repeated cyclic loading?
What is the primary cause of fatigue failure in materials subjected to repeated cyclic loading?
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Which of the following properties characterizes the ability of a material to absorb energy before fracturing?
Which of the following properties characterizes the ability of a material to absorb energy before fracturing?
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In the context of material deformation, what is the significance of the 'first/early cycles effect'?
In the context of material deformation, what is the significance of the 'first/early cycles effect'?
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Which of the following statements best describes the clinical relevance of understanding the mechanical properties of biological tissues?
Which of the following statements best describes the clinical relevance of understanding the mechanical properties of biological tissues?
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Which mechanical property is directly related to the slope of the stress-strain curve in the linear, elastic region?
Which mechanical property is directly related to the slope of the stress-strain curve in the linear, elastic region?
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When an object is subjected to a bending moment, which type of stress is predominant in the outer, convex portion of the object?
When an object is subjected to a bending moment, which type of stress is predominant in the outer, convex portion of the object?
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In the context of tissue mechanics, what is the 'yield point' referring to?
In the context of tissue mechanics, what is the 'yield point' referring to?
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What is the primary function of the 'neutral axis' in a bent object?
What is the primary function of the 'neutral axis' in a bent object?
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Study Notes
Tissue Mechanics
- Tissue responds to loading, and it fails when an imposed load exceeds its tolerance (load-carrying ability)
- Factors affecting tissue response to loading:
- Extensibility of various tissues
- Effect of stiffness on injury
- Influence of tissue structure on function
- Advantage of composite tissue
- Clinical relevance of mechanical properties of biological tissues
Material Properties
- Brittleness: absence of any plastic deformation prior to failure
- Resilience: measure of energy absorbed by a material and returned when load is removed
- Toughness: property of a material enabling it to endure high-impact or shock loads
- Uniqueness of biological materials:
- Anisotropic
- Viscoelastic
- Time-dependent behavior
- Loading rate-dependent behavior
- Organic
- Self-repair
- Adaptation to changes in mechanical demand
Viscoelasticity
- Pure elastic material: not viscoelastic, all energy returned
- Hysteresis: area representing energy lost in viscoelastic materials
Bending
- Bending occurs when a moment is applied to an object, producing compression on one side and tension on the other
- Factors affecting bending:
- Magnitude of the bending moment
- Shape and mechanical properties of the object
- Types of bending:
- Three-point bending: failure at middle, e.g., ski boot fracture
- Four-point bending: failure at the weakest point between two inside forces
- Cantilever bending: compressive force acting off-center from long axis
Material Failure
- Material fatigue: repeated loads above a certain threshold
- Cumulative effect: continued loading failure
- Initial cycles effect: shift in mechanical response
- Material failure types:
- Elastic deformation: material completely recovers from strain
- Plastic deformation: material shows permanent deformation following strain
- Brittle material: continues to deform elastically until breaks
- Malleable material: deforms plastically before breaking
- Stress at which a material's deformation changes from elastic to plastic is the yield stress or elastic limit
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Description
This quiz covers basic definitions and general properties of tissue mechanics, along with the clinical relevance of mechanical properties of biological tissues. It also discusses how tissues respond to loading and when they fail under different types of loading.
