应变双向性对应变结晶弹性体高温行为有明显的影响
Ryosuke Osumi1, Thanh-Tam Mai2, Katsuhiko Tsunoda3
1Department of Polymer Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
Soft matter
|June 5, 2025
概括
应变双轴性显著降低了应变诱导结晶 (SIC) 和中强化温度. 这种在高温下至关重要的效应会影响复杂应力下的材料耐用性.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 应变诱导结晶 (SIC) 增强了的强化.
- 在各种变形条件下了解SIC对于材料设计至关重要.
研究的目的:
- 研究应变双向性对自然 (NR) 和合成异烯 (IR) 在高温下对SIC的影响.
- 为了比较SIC在单轴拉伸和伪平面拉伸下的行为.
- 分析SIC异质性在高温中抗断性中的作用.
主要方法:
- 单轴 (U) 和伪平面 (P) 拉伸几何学的比较分析.
- 在不同侧面收缩下评估SIC发作温度和晶体化温度.
- 高温断裂实验,观察裂传播模式.
主要成果:
- 与单轴拉伸相比,伪平面拉伸显著降低了SIC诱导增强的上限温度超过20°C.
- 在伪平面几何学中,SIC晶体的融化温度降低了30°C以上.
- 应变双向性抑制SIC发病和热稳定性,在IR中比NR更明显的影响.
- 断裂实验显示,由于空间异质的SIC,造成非线性裂传播,而SIC则充当屏障.
结论:
- 应变双轴性极大地影响SIC和强化,即使在高温下也是如此.
- 有限的横向拉伸显著影响SIC的温度极限和稳定性.
- 在SIC的空间异质性在增强骨折抵抗方面发挥着关键作用.
- 调查结果为开发耐用的SIC材料提供了洞察力,用于苛刻的应用.
更多相关视频
相关概念视频
Plastic Behavior
274
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...
274
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
335
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
335
Thermal Strain
2.5K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.5K
Members Made of Elastoplastic Material
166
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...
As the bending moment...
166
Stress-Strain Diagram - Ductile Materials
990
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...
990
Hooke's Law
577
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
577


