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Structural behavior of bones in human body

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Biomechanics

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Structural behavior of bones in human body

  1. 1. 1 Presentation on Structural Behavior of Bones in Human Body By: Shubham Satish Babar Department of Civil Engineering 2016-17
  2. 2. Contents - 2  Introduction  Bone  Loads on Bones  Bone Structure and Mechanical property  Failure  In Human Skeleton  In RC frame system  Repair technique to failure  Case study  Conclusion
  3. 3. Introduction - 3  Behaviour of Structure is very similar to behaviour of Human Body structure  The forces affecting on the behaviour of RC structure is similar to the forces acting on human body structure, but with different intensity  Performance of Reinforcement in RC structures are same as performance of Bones in human body  Strength to human body structure is provided by Bones
  4. 4. 4 Purposes of Bone  Provides mechanical support  Produces red blood cells  Protects internal organs  Provides rigid mechanical links and muscle attachment sites  Facilitates muscle action and body movement  Serves as active ion reservoir for calcium and phosphorus
  5. 5. Composition and Structure of Bone  Consists of cells and an organic extracellular matrix of fibers and ground substance  High content of inorganic materials (mineral salts combined with organic matrix)  Organic component  flexible and resiliant  Inorganic component  hard and rigid  Mineral portion of bone primarily calcium and phosphate (minerals 65-70% of dry weight)  Bone is reservoir for essential minerals (e.g., calcium) 5
  6. 6. 6  Gravity force  Body forces  Moment when walking, running, jumping  Pulling in (Compression)  Pulling out (Tension)  More than 70% of Bending moments on a bone are transmitted by muscle force rather than body weight Forces acting on joints (Bone) -
  7. 7. 7 Load Deformation Testing Bone Steel Bar
  8. 8. 8 Load Deformation Curve - Bone RC Material Courtesy- Structure and Function of the Musculoskeletal System by Professor Alan Hedge
  9. 9. 9 Properties of Stiffness and Brittle/Ductile •Metal – large plastic region •Virtually no plastic region in glass •Stress-strain curve of bone not linear •Yielding of bone tested in tension caused by debonding of osteons at cement lines and micro fractures
  10. 10. 10 Relationships of Age to Stress- Strain Characteristics of Bone Courtesy- Structure and Function of the Musculoskeletal System by Professor Alan Hedge
  11. 11. Age vs Strength Graph - 11 Courtesy - JOURNAL OF BONE AND MINERAL RESEARCH Volume 12, Number 10, 1997 Bone RC Section
  12. 12. Age Effect - 12   brittleness   strength  ( cancellous bone & thickness of cortical bone)   ultimate strain   energy storage 100 110 120 130 140 150 160 170 180 20-29 30-39 40-49 50-59 60-69 70-79 80-89 Age (yrs) Stress(MPa) Femur - Yield Tibia - Yield Femur - Ultimate Tibia - Ultimate
  13. 13. Load on Foot bone - 13
  14. 14. Load on Foot bone - 14 Load vs Time graph of 30 kg female while walking -
  15. 15. 15 Stress vs Time graph of 30 kg female while walking and runnin
  16. 16. Fracture Mechanism 16  Repetitive stress
  17. 17. 17 Failure in RC Beam -
  18. 18. 18 A bending load at three points creates fracture in ski boots and occurs when the ski is detained abruptly
  19. 19. 19 A torsion strength applied to the bone creates a shear stress to t
  20. 20. Failure in Bones - 20
  21. 21. Repair technique in RC Frame - 21
  22. 22. 22 Repair technique in Human Body -
  23. 23. 23
  24. 24. Conclusion - 24  Structural behavior of bones in human body is behave live same exactly as reinforcement concrete sections and materials  Bone have all mechanical properties same as materials used in structural elements of building and it obey the Hook’s Law  Material properties of bone are varies with respect to age  Repair techniques in RC frame are same as Human body repair techniques
  25. 25. REFERENCES - 25 1. FRACTURE HEALING by Dr. Nuri Aydın, Assoc. Prof. Istanbul University Cerrahpasa School of Medicine 2. Structure and Function of the Musculoskeletal System by Professor Alan Hedge 3. O'Connor M, Shercliff T, Goodfellow J. The mechanics of the knee in the sagittal plane: mechanics, interactions between muscles, ligaments, and the articular surfaces. In: Muller W, HW, eds. Surgery and arthroscopy of the knee. New York: Springer Verlag, 19881 4. Commentary on Muscle Strength, Bone Mass, and Age-Related Bone Loss by DAVID B. BURR in JOURNAL OF BONE AND MINERAL RESEARCH Volume 12, Number 10, 1997 Blackwell Science, Inc.
  26. 26. Thank You… 26

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