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Related Concept Videos

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Stress: General Loading Conditions01:15

Stress: General Loading Conditions

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To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
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General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

585
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

524
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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Residual Stresses in Bending01:18

Residual Stresses in Bending

643
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Design of a Biaxial Mechanical Loading Bioreactor for Tissue Engineering
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Functional Validation of a Complex Loading Whole Spinal Segment Bioreactor Design.

Amanda M Beatty, Anton E Bowden, Laura C Bridgewater

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    A novel bioreactor system successfully mimics in vivo spinal loading conditions for intervertebral disc (IVD) degeneration research. This dynamic system enhances IVD cell viability, proving valuable for preclinical testing of therapies.

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    Area of Science:

    • Biomedical Engineering
    • Orthopedics
    • Regenerative Medicine

    Background:

    • Intervertebral disc (IVD) degeneration is a major cause of back pain.
    • Ex vivo IVD organ culture systems are emerging tools for disease research.
    • Existing systems may not fully replicate in vivo loading conditions.

    Purpose of the Study:

    • To develop and validate a novel whole spinal segment culturing system.
    • To apply complex, in vivo-like loading to the IVD.
    • To preserve adjacent vertebral bodies and endplates during culture.

    Main Methods:

    • A dynamic bioreactor with three pneumatic cylinders was designed to apply complex loading (flexion-extension, bending, compression).
    • Bovine caudal IVDs with intact endplates and vertebral bodies were cultured for 14 days under physiological loading (100 N compression, 2-4 N·m torque).
    • Cell viability was assessed and compared between loaded and unloaded control IVDs.

    Main Results:

    • The bioreactor successfully applied complex physiological loading mimicking daily activities.
    • IVD cell viability was significantly higher in the loaded group compared to unloaded controls after 14 days.
    • The system preserved the integrity of the endplates and vertebral bodies.

    Conclusions:

    • The developed dynamic bioreactor effectively replicates in vivo loading conditions for whole spinal segments.
    • This system offers a promising platform for extended preclinical testing of spinal devices and therapies.
    • Improved IVD cell viability under dynamic loading highlights its potential for studying degeneration and treatment responses.