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IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4

IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4. Other Fatigue Effects. Other Fatigue Effects. Joints. Types of joints: Synovial – articulating surfaces, surrounded by capsule (shoulder, knee)

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IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4

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  1. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4 IE 553

  2. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #4 IE 553

  3. Other Fatigue Effects IE 553

  4. Other Fatigue Effects IE 553

  5. Joints Types of joints: • Synovial – articulating surfaces, surrounded by capsule (shoulder, knee) • Fibrous – fibers bridge gap (skull) • Cartilage – cartilage bridges gap (vertebral discs in spinal column) IE 553

  6. Synovial Joint • Cartilage (cells 2%) • Collagen fibers (60%) • Proteoglycan gel (38%) • Poor regeneration • Liquid (synovial fluid) • Decreases friction • Through lubrication • Hydrostatic • Squeeze film • Hydrodynamic IE 553

  7. Vertebral Column IE 553

  8. Intervertebral Discs • Role in body • Cushion impacts • Deform under loads • Transfer of fluids • Degeneration • Microfractures at high loads • Loss of fluids/solids • Drying up • Weakening of fibers • Catastrophic extrusion IE 553

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