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相关概念视频

Members Made of Elastoplastic Material01:19

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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.
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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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超弹性特征通过深度缩

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.

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概括
此摘要是机器生成的。

深度痕精确地描述了软材料的超弹性,为传统的拉力测试提供了实用替代方案. 这种方法揭示了通用抛物线力深度缩放,以可靠地提取物质.

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科学领域:

  • 材料科学
  • 固体机械学
  • 生物力学

背景情况:

  • 超弹性材料的特征对于理解软材料如组织和聚合物至关重要.
  • 传统的单轴拉伸试验需要复杂的样品准备,不适合实地分析.
  • 基于入的方法提供了非破坏性的现场替代方案,但需要深度入以进行超弹性表征.

研究的目的:

  • 通过有限元分析建立力-深度缩进曲线和超弹性行为之间的联系.
  • 识别和分析软不压缩材料的不同缩模式 (赫兹,抛物线,中间).
  • 研究材料特性 (奥格登应变强度系数) 和摩擦对缩反应的影响.

主要方法:

  • 使用有限元分析 (FEA) 来建模软不可压缩材料的隙.
  • 一个单项的奥格登模型被用来表示超弹性材料的行为.
  • 分析了不同入模式 (D/R比率) 的强度 (F) 与入深度 (D) 曲线.

主要成果:

  • 确定了三种不同的缩进模式:赫兹式 (D ≪ R),抛物线式 (D ≫ R) 和中间模式.
  • 发现奥格登应变强化系数 (α) 增加了抛物线缩系数 (β),使得从β进行α估计.
  • 观察到库伦摩擦会增加β,可能掩盖小α的应变强化效应,但对于α>3变得微不足道.
  • 在各种软材料 (Ecoflex,Mold Star,猪皮) 上进行的实验验证实与预测的电力法制度有很好的一致性.

结论:

  • 深度缩提供了通用抛物线力深度缩放,为超弹性特性提取提供了可靠的方法.
  • 基于隙的表征是软材料现场分析的传统拉力测试的实用和有效替代方案.
  • 这项研究表明,高精度地 (在20%的偏差范围内) 从缩数据中推断出超弹性特性 (α和E).