相关实验视频
Updated: Jan 14, 2026
06:54
Ultrasonic Fatigue Testing in the Tension-Compression Mode
Published on: March 7, 2018
11.1K
描述UHMWPE的疲劳值行为
Bethany B Smith1, Anurag Roy2, Robert O Ritchie3
1Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
Journal of the mechanical behavior of biomedical materials
|October 17, 2025
概括
这项研究研究了超高分子量聚乙烯 (UHMWPE) 的疲劳裂阻断值,用于全关节置换. 它发现J-整体断裂性最好预测疲劳性能,突出突出交叉连接.
科学领域:
- 生物材料科学 生物材料科学
- 聚合物工程 聚合物工程
- 骨科生物力学 骨科生物力学
背景情况:
- 超高分子量聚乙烯 (UHMWPE) 是全关节置换 (TJR) 的首选材料,因为它具有耐磨性和生物相容性.
- 虽然磨损和氧化已经得到了广泛的研究,但UHMWPE在TJR中的疲劳行为仍然不太了解,特别是关于裂的启动和传播.
- 现有的文献在描述骨科级UHMWPE的疲劳值和接近值的疲劳行为方面存在差距.
研究的目的:
- 描述临床相关的UHMWPE配方的疲劳裂阻断值.
- 探索疲劳值和医疗级UHMWPE树脂的大体机械/微结构性质之间的相关性.
- 调查交叉连接对UHMWPE疲劳性能的影响,并确定疲劳值的预测指标.
主要方法:
- 在临床上相关的UHMWPE配方中,疲劳裂阻断值的表征.
- 检查疲劳值,散装机械性能和微观结构特征之间的相关性.
- 评估交叉连接在UHMWPE疲劳性能中的作用.
主要成果:
- 该研究成功地描述了各种UHMWPE配方的疲劳裂阻断值.
- 确定J-整体断裂性是UHMWPE疲劳值的最有效预测因素.
- 经证实,交叉连接在提高UHMWPE疲劳性能方面发挥着重要作用.
结论:
- 在无法直接测量值时,J-整体断裂性可以作为可靠的替代度量来预测UHMWPE疲劳性能.
- 交叉连接是改善用于骨科应用的UHMWPE耐疲劳性的关键因素.
- 真正的构成参数提供了UHMWPE机械行为最准确的描述.
相关概念视频
01:21Fatigue
794
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
794
01:21Plastic Behavior
519
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...
519
01:25Yield Criteria for Ductile Materials under Plane Stress
472
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
472
01:22Fatigue Strength of Concrete
535
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
535
01:24Stress-Strain Diagram - Ductile Materials
1.9K
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...
1.9K
01:20Strain-Energy Density
833
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...
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...
833