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関連する概念動画

Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

155
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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Elasticity01:12

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Elasticity is the ability of an object to withstand the effects of distortion and to return to its original size and shape once the forces causing deformation are removed. When an elastic material deforms under the action of an external force, it experiences internal resistance to the deformation. However, if no external force is applied, it returns to its original state.
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Residual Stresses in Bending01:18

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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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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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深層インデントによる超弾性特性

Mohammad Shojaeifard1, Mattia Bacca1

  • 1Mechanical Engineering Department, Institute of Applied Mathematics School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. mbacca@mech.ubc.ca.

Soft matter
|September 4, 2025
PubMed
まとめ
この要約は機械生成です。

深層インデントは,柔らかい材料の超弾性性を正確に特徴付け,従来の引力試験の実用的な代替案を提供します. この方法は,信頼性の高いin situプロパティ抽出のための普遍的なパラボリックフォース深度スケーリングを明らかにします.

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科学分野:

  • 材料科学
  • 固体力学
  • バイオメカニクス

背景:

  • 繊維やポリマーのような 柔らかい物質を理解するには 超弾性材料の特徴づけが不可欠です
  • 伝統的な単軸引力試験では,複雑な試料の準備が必要であり, in situ 分析には適していません.
  • インデントベースの方法は,破壊的でない,in situの代替手段を提供しますが,超弾性特性のために深いインデントが必要です.

研究 の 目的:

  • 有限要素解析を用いて,力-深さインデントーション曲線と高弾性行動との関連を確立する.
  • 柔らかい非圧縮材料の異なるインデントレジム (ヘルツ,パラボリック,中間) を特定し,分析する.
  • 材料の特性 (オグデン張力硬化係数) と摩擦がインデント反応に及ぼす影響を調査する.

主な方法:

  • 軟質の非圧縮材料のインデントをモデル化するために,有限要素分析 (FEA) が使用された.
  • 超弾性物質の振る舞いを表現するために,単項オグデンモデルが使用されました.
  • フォース (F) とインデント深度 (D) の曲線は,異なるインデント方式 (D/R比) で分析された.

主要な成果:

  • 3つの異なるインデントレジームが特定されました.ヘルツ (D ≪ R),パラボリック (D ≫ R) と中間レジームです.
  • オグデン張力強化係数 (α) は,パラボリックインデント系数 (β) を増加させ,βからαの推定を可能にしました.
  • クーロンフリクションはβを増加させ,小さなαのストレスの強化効果を隠す可能性があるが,α > 3の場合は無視できる.
  • 様々な柔らかい材料 (Ecoflex,Mold Star,豚の皮) の実験的検証は,予測されたパワー・ロー・レジームと良好な一致を示した.

結論:

  • ディープインデントは普遍的なパラボリックフォース深度スケーリングを提供し,超弾性特性の抽出のための信頼性の高い方法を提供します.
  • インデンテーションベースの特徴付けは,柔らかい材料のインシット分析のための従来の引力試験の実用的で効果的な代替手段です.
  • この研究は,インデントデータから高精度 (20%の偏差以内) で超弾性特性 (αとE) を抽出する可能性を実証している.