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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Bending of Members Made of Several Materials01:08

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Euler's Formula to Columns: Problem Solving01:23

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Euler's formula is used in structural engineering to determine the buckling load of columns under various conditions. However, when dealing with systems that incorporate both rigid elements and elastic components, such as springs, the analysis requires a finer approach to determine the critical load. The problem described involves two rigid bars connected at a pivot point with a spring attached and a vertical load applied at one end.
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Statically Indeterminate Problem Solving01:16

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Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
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Related Experiment Video

Updated: Oct 3, 2025

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
07:55

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

Published on: November 9, 2012

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On rigid origami III: local rigidity analysis.

Zeyuan He1, Simon D Guest1

  • 1Civil Engineering Building, Department of Engineering, 7a JJ Tomson Ave, University of Cambridge, Cambridge CB3 0FA, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences
|February 17, 2022
PubMed
Summary
This summary is machine-generated.

This study explores rigid origami using rigidity theory, defining first- and second-order rigidity, static rigidity, and prestress stability. It reveals hierarchical relationships between these rigidities, offering new insights for origami design.

Keywords:
first orderfoldabilityloadprestress stabilitysecond orderstress

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Related Experiment Videos

Last Updated: Oct 3, 2025

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
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Published on: November 9, 2012

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Mathematics

Background:

  • Rigid origami, a field combining geometry and mechanics, has potential applications in deployable structures and robotics.
  • Understanding the rigidity of origami structures is crucial for their practical implementation and stability.

Purpose of the Study:

  • To analyze rigid origami through the lens of rigidity theory.
  • To define and differentiate various types of rigidity (first-order, second-order, static, and prestress stability) in origami.
  • To explore the hierarchical relationships among these rigidity concepts.

Main Methods:

  • Application of local differential analysis to define first- and second-order rigidity based on consistency constraints.
  • Determination of static rigidity and prestress stability by analyzing internal forces and loads.
  • Drawing parallels with conventional rigidity theory for bar-joint frameworks, while incorporating higher-order rotational constraints.

Main Results:

  • Formal definitions for first-order, second-order, static rigidity, and prestress stability in rigid origami.
  • Demonstration of a hierarchical relationship among the defined rigidity types.
  • A novel interpretation of internal forces and geometric errors in constraints, linked to energy.

Conclusions:

  • The study provides a theoretical framework for understanding the rigidity of origami structures.
  • Insights gained may facilitate the development of novel folding patterns and the design of origami-based structures requiring specific rigidity properties.