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Related Concept Videos

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

276
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
276
Bearing Stress01:22

Bearing Stress

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Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

311
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
311
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

260
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
260
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

1.0K
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Stresses in a Shaft01:18

Stresses in a Shaft

544
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
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The C-seal: A Biofragmentable Drain Protecting the Stapled Colorectal Anastomosis from Leakage
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Strain-stiffening seal.

Baohong Chen1, Chao Chen1,2, Yucun Lou3,4

  • 1John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, MA 02138, USA. suo@seas.harvard.edu.

Soft Matter
|March 30, 2022
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Summary
This summary is machine-generated.

Strain-stiffening elastomers offer superior sealing performance compared to neo-Hookean elastomers. These advanced materials enhance sealing pressure by resisting both elastic deformation and rupture, improving seal reliability.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Fluid Dynamics

Background:

  • Elastomeric seals require a balance of softness for installation and stiffness to prevent fluid leakage.
  • Traditional elastomers like neo-Hookean models may not optimally meet these dual requirements.

Purpose of the Study:

  • To investigate the sealing performance of strain-stiffening elastomers.
  • To compare their effectiveness against neo-Hookean elastomers in preventing fluid flow.
  • To analyze the mechanisms of seal failure.

Main Methods:

  • Modeling strain-stiffening elastomers using the Gent model.
  • Calculating seal deformation via an analogy to lubrication theory.
  • Determining sealing pressure based on elastic deformation and rupture failure modes.

Main Results:

  • Strain-stiffening elastomers demonstrate enhanced sealing pressure compared to neo-Hookean elastomers.
  • The study identifies two primary leak modes: elastic deformation and rupture.
  • Diagrams demarcating these leak modes were constructed.

Conclusions:

  • Strain-stiffening elastomers provide superior sealing capabilities by increasing resistance to both leak mechanisms.
  • This research can inform the design of improved seal materials and geometries.
  • Optimized seal design can lead to more reliable fluid containment systems.