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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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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...
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Strain-Energy Density01:20

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Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
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Elastic Strain Energy for Normal Stresses01:22

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Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
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Strain Energy01:13

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Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Related Experiment Video

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Multistable Architected Materials for Trapping Elastic Strain Energy.

Sicong Shan1, Sung H Kang1,2, Jordan R Raney1,3

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.

Advanced Materials (Deerfield Beach, Fla.)
|June 20, 2015
PubMed
Summary

New architected materials designed using 3D printing and numerical analysis offer reusable energy absorption. Their unique bistable beam elements enable controlled elastic energy trapping, independent of material or loading rate.

Keywords:
3D printingarchitected materialsenergy trappingmultistabilityreversibility

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Architected materials offer tunable mechanical properties.
  • Bistable structures can store and release mechanical energy.
  • Controlled elastic energy trapping is crucial for impact absorption.

Purpose of the Study:

  • To design novel architected materials with controlled elastic energy trapping.
  • To develop reusable energy-absorbing structures.
  • To investigate geometry-driven energy absorption mechanisms.

Main Methods:

  • Combined 3D printing and numerical analysis for material design.
  • Incorporated bistable beam elements into material architecture.
  • Analyzed the energy absorption mechanism based on structural geometry.

Main Results:

  • Successfully designed architected materials with bistable beam elements.
  • Demonstrated controlled trapping of elastic energy.
  • Confirmed reusability of the energy-absorbing structures.
  • Established material- and loading-rate independence of energy absorption.

Conclusions:

  • The proposed architected materials provide a novel approach to reusable energy absorption.
  • Structural geometry is the key determinant of energy absorption capabilities.
  • This design offers potential for applications requiring predictable and repeatable energy dissipation.