温度和裂尖速度对弹性固体中裂传播的影响
1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000 Lanzhou, China; Peter Grünberg Institute (PGI-1), Forschungszentrum Jülich, 52425 Jülich, Germany; and Multiscale Consulting, Wolfshovener Str. 2, 52428 Jülich, Germany.
The Journal of chemical physics
|November 11, 2024
概括
温度和裂尖速度显著影响类材料中的键断裂. 这影响了裂传播能量,特别是粘合剂裂,与的实验数据保持一致.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物物理 聚合物物理
- 粘附科学 粘附科学 粘附科学
背景情况:
- 了解聚合物中的裂纹传播对于材料耐用性至关重要.
- 在裂纹尖端断裂的纽带是影响材料故障的关键因素.
- 温度和裂尖速度对键断裂的影响需要进一步研究.
研究的目的:
- 为了研究温度和裂尖速度对类材料的结合破解的影响.
- 确定这些参数与有效裂传播能量之间的关系.
- 为了验证理论模型与实验数据对粘合和凝聚力裂的验证.
主要方法:
- 理论建模的断债作为压力辅助,热激活的过程.
- 分析有效的裂纹传播能量作为温度和裂纹尖端速度的函数.
- 理论预测与实验粘附测量的比较,用于聚甲基 (PDMS) 在玻璃 (粘合剂裂).
- 与对化玻璃 (凝聚裂) 上PDMS薄膜的实验结果进行比较.
主要成果:
- 有效的裂传播能量随着温度的下降和裂尖端速度的增加而显著增加.
- 这种效应在粘合性 (界面) 裂传播中比凝聚性 (批量) 裂传播更为明显.
- 粘合剂裂的理论结果与实验粘合度测量结果有很好的一致性.
- 凝聚力裂的理论结果与实验数据保持一致.
结论:
- 温度和裂尖速度是控制弹性体中键断和裂纹传播的关键参数.
- 开发的理论框架准确地描述了粘合性和凝聚性裂场景的观察现象.
- 这些发现对预测和控制各种应用中类材料的故障行为有影响.
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