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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

501
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
501

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整合多级FE2M模拟和实验,预测软骨中的微裂纹损伤.

Kosar Safari1, Ashkan Almasi1, Phoebe Szarek1

  • 1School of Mechanical, Aerospace, and Manufacturing Engineering, University of Connecticut, Storrs, CT, United States.

Journal of biomechanical engineering
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此摘要是机器生成的。

关节软骨微损伤是骨关节炎 (OA) 的前体,可以使用多尺度计算模型进行预测. 该框架准确地捕捉了撞击和周期性负载下的原体网络故障,有助于OA研究.

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相关实验视频

Last Updated: Feb 19, 2026

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科学领域:

  • 生物医学工程 生物医学工程
  • 计算力学 计算力学 计算力学
  • 组织工程是组织工程.

背景情况:

  • 关节软骨容易受到撞击的微伤害,可能导致关节性关节炎 (OA).
  • 了解原蛋白网络机制对于预测软骨衰竭至关重要.
  • 现有的模型往往缺乏用于准确损害预测的多尺度集成.

研究的目的:

  • 开发和验证一个多尺度计算框架 (FE2M),用于预测关节软骨中微伤害的发起和传播.
  • 为了将宏观软骨变形与微观纤维机制结合起来.
  • 为了研究压力与拉伸在软骨衰竭中的作用.

主要方法:

  • 在FEBio中使用了多尺度混合物的有限元素 (FE2M) 框架.
  • 生成统计等价的代表体积元素 (SERVEs) 来建模异型原体结构.
  • 模拟撞击和循环压缩负载条件,根据实验数据进行验证.

主要成果:

  • 纤维故障分数的FE2M预测与实验测量的微裂纹分数强烈一致.
  • 高冲击模拟显示压力,而不是拉伸,作为更可靠的失败预测器.
  • 模型证明了纤维纤维硬度参数变化的稳定性.

结论:

  • 经过验证的FE2M框架准确地捕捉了关节软骨中的多尺度机械行为和微损伤趋势.
  • 这种方法为了解软骨退化提供了一个预测工具.
  • 潜在的应用包括伤害风险评估和OA预防策略.