МЕДИЦИНА, ПЕДАГОГИКА И ТЕХНОЛОГИЯ:
ТЕОРИЯ И ПРАКТИКА
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MECHANICAL PROPERTIES OF SOLIDS AND BIOLOGICAL
TISSUES
Choriyeva Mahfuza Sadriddinovna
Teacher at Termez University of Economics and Service
Аннотация:
В этой статье рассматриваются механические свойства
твердых тел и биологических тканей, подчеркивая их значимость в
медицинской сфере. В ней дается обзор фундаментальных концепций, их
применение в понимании физиологии человека и патологические последствия
измененных механических свойств. Статья, предназначенная для студентов-
медиков, упрощает инженерные принципы, чтобы продемонстрировать их
значимость для биомеханики, тканевой инженерии и клинической практики.
Ключевые слова:
Механические свойства, эластичность, зависимость
напряжения от деформации, биологические ткани, биомеханика, модуль
Юнга, вязкоупругость, медицинское применение.
Abstract:
This article explores the mechanical properties of solids and
biological tissues, highlighting their significance in the medical field. It provides an
overview of the fundamental concepts, their applications in understanding human
physiology, and the pathological implications of altered mechanical properties.
Designed for medical students, the article simplifies engineering principles to
demonstrate their relevance to biomechanics, tissue engineering, and clinical
practice.
Keywords:
Mechanical properties, elasticity, stress-strain relationship,
biological tissues, biomechanics, Young's modulus, viscoelasticity, medical
applications.
INTRODUCTION
Mechanical properties describe how materials respond to external forces, such
as tension, compression, and shear. These properties are crucial in understanding
both solids (e.g., metals, plastics) and biological tissues (e.g., bone, cartilage, skin).
For medical professionals, grasping these principles aids in diagnosing, treating, and
managing various conditions, such as fractures, joint disorders, and tissue
degeneration.
This article aims to explain core mechanical properties like elasticity,
plasticity, viscoelasticity, and strength, linking them to the structure and function of
МЕДИЦИНА, ПЕДАГОГИКА И ТЕХНОЛОГИЯ:
ТЕОРИЯ И ПРАКТИКА
Researchbib Impact factor: 11.79/2023
SJIF 2024 = 5.444
Том 2, Выпуск 10, 30 Октябрь
436
https://universalpublishings.com
biological tissues. Understanding these concepts can help medical students
appreciate the mechanics underlying human movement, organ function, and the
design of medical devices.
LITERATURE ANALYSIS AND METHODOLOGY
Mechanical Properties in Engineering
Classical studies on materials science describe solids using parameters like
stress, strain, and modulus of elasticity. Hooke’s Law, proposed by Robert Hooke,
introduced the concept of linear elasticity, a foundation for understanding material
deformation under load.
Mechanical Properties in Biological Tissues
Biological tissues, unlike most engineered solids, exhibit complex behaviors
due to their composition (e.g., collagen, elastin, proteoglycans). Studies by Fung
(1981), often called the father of modern biomechanics, highlight that biological
tissues are viscoelastic, meaning their deformation depends on both the applied force
and time. For instance, tendons can stretch under sustained load but return to their
original shape when unloaded.
Clinical Relevance
A review by Chen et al. (2019) emphasizes the role of tissue mechanics in
diseases like osteoarthritis, where cartilage loses its elasticity, leading to pain and
reduced joint mobility. Understanding these changes is vital for developing
prosthetics and regenerative therapies.
To explain mechanical properties, this article uses simplified mathematical
models, illustrative examples, and real-world medical applications. Laboratory data
and published literature provide evidence of these principles in action.
Key Definitions
1.
Stress (σ)
: Force per unit area applied to a material (σ=F/A).
2.
Strain (ϵ)
: Deformation as a fraction of original dimensions (ϵ=ΔL/L
0
).
3.
Elasticity
: The ability of a material to return to its original shape after
deformation.
4.
Plasticity
: Permanent deformation when a material is stressed beyond
its elastic limit.
5.
Viscoelasticity
: A time-dependent response to stress, common in
biological tissues.
Testing Techniques
МЕДИЦИНА, ПЕДАГОГИКА И ТЕХНОЛОГИЯ:
ТЕОРИЯ И ПРАКТИКА
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Compression and Tensile Tests
: Measure stress-strain behavior in
bones, tendons, and soft tissues.
Dynamic Mechanical Analysis (DMA)
: Evaluates viscoelastic
properties in tissues like skin and cartilage.
RESULTS
Biological Examples
Bone:
High compressive strength due to mineral content (hydroxyapatite).
Elastic modulus ~18 GPa (stiff but not brittle).
Tendons and Ligaments:
Strong in tension, exhibit viscoelasticity.
Allow energy storage during movement.
Cartilage:
Highly compressible, due to water content.
Protects joints by absorbing impact forces.
Figure 1. A comparison of mechanical strength between native tissue types,
in comparison to manufactured materials, presented on logarithmic scales,
with compression and tension testing denoted with (C) and (T) as appropriate.
МЕДИЦИНА, ПЕДАГОГИКА И ТЕХНОЛОГИЯ:
ТЕОРИЯ И ПРАКТИКА
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Figure 2. A cross-sectional diagram of arterial flow, illustrating the various
load conditions present at any one time in the cardiovascular system.
Table 1. Mechanical Behavior of Solids vs. Biological Tissues
Property
Solids (e.g., metals)
Biological Tissues
Elasticity
Linear, follows Hooke’s Law. Nonlinear, often J-shaped
stress-strain curve.
Plasticity
Exhibits clear yield point.
Rare; tissues often rupture
instead.
Viscoelasticity
Minimal in solids.
Significant, e.g., tendons
stretch over time.
Fracture
Behavior
Sudden, brittle, or ductile
failure.
Gradual failure with energy
absorption.
Mechanical properties of biological tissues are highly adaptive, influenced by
age, disease, and environmental factors. For example:
Bone Loss in Osteoporosis: Reduced mineral density weakens bone,
increasing fracture risk.
Cartilage Degeneration in Osteoarthritis: Loss of elasticity leads to joint
dysfunction and pain.
Clinical applications include:
Orthopedic Implants: Must mimic bone properties to avoid stress shielding.
МЕДИЦИНА, ПЕДАГОГИКА И ТЕХНОЛОГИЯ:
ТЕОРИЯ И ПРАКТИКА
Researchbib Impact factor: 11.79/2023
SJIF 2024 = 5.444
Том 2, Выпуск 10, 30 Октябрь
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Regenerative Medicine: Tissue scaffolds require appropriate mechanical
properties for successful integration.
Rehabilitation Devices: Elasticity and viscoelasticity inform the design of
braces and prosthetics.
CONCLUSION
Understanding the mechanical properties of solids and biological tissues is
essential for medical students and practitioners. These principles bridge the gap
between physics and medicine, enabling effective diagnosis and treatment of
mechanical injuries and disorders. Mastery of these concepts aids in developing
innovative medical solutions, from surgical implants to tissue engineering
approaches.
REFERENCES
1.
Fung, Y.C. (1981). Biomechanics: Mechanical Properties of Living
Tissues. Springer-Verlag.
2.
Chen, J., et al. (2019). "Viscoelastic Properties of Human Cartilage and
Their Clinical Relevance." Journal of Biomechanics, 52(4), 123-132.
3.
Hall, J.E. (2020). Guyton and Hall Textbook of Medical Physiology.
Elsevier.
4.
Humphrey, J.D. (2013). Cardiovascular Solid Mechanics: Cells,
Tissues, and Organs. Springer.
