膜基系统中膜断裂花纹的实验与模型
发布时间：2018-12-31 11:38
【摘要】：薄膜基底系统中膜断裂的现象非常广泛。例如:田地的龟裂,路面的开裂,树干的裂纹、工业涂层的断裂等。由于现实生活中会大量遇到类似情况,各种问题也就接踵而来,比如裂纹是什么原因造成的,裂纹形状有什么样的规律,如何避免裂纹的产生,裂纹产生后如何进行修补等。因此对于薄膜基底系统中膜断裂的研究具有非常重要的意义。从国内外所做的实验研究分析,可以大致看出,研究的重点大部分集中于对的薄膜基底热失配引起的热失配问题、屈曲问题,还有厚度比对裂纹影响问题;对于薄膜的泊松比和材料性质的不匹配对于花纹的影响等还没有令人满意的结果,因此本课题选题有一定的研究价值。本文以三元乙丙烯橡胶为基底与脆性薄膜来进行实验,根据实验现象,提出一个断裂模型。鉴于实验中基底采用的是三元乙丙烯橡胶,为了易于观察裂纹形状,采用较脆材料的薄膜。进行了六组不同厚度的单轴拉伸实验,以及两组双轴拉伸实验,选择微控电子拉力试验机进行实验来观察裂纹的扩展规律。采用六组不同厚度的薄膜基底系统样片进行单轴拉伸实验所得的实验数据,将所得应力应变数据选择一阶求导方法,观察数据散点图,根据其特点进行取平均值得出薄膜的断裂应力。通过实验,将本文的断裂模型与实验数据分析对比,验证本文所提出模型的有效性。
[Abstract]:The phenomenon of film fracture in the film substrate system is very extensive. For example: crack of field, crack of road surface, crack of trunk, fracture of industrial coating, etc. Due to the large number of similar situations in real life, a variety of problems will follow, such as what causes the crack, what kind of law the shape of the crack, how to avoid the occurrence of the crack, how to repair the crack after the occurrence and so on. Therefore, the study of film fracture in thin film substrate system is of great significance. From the analysis of experimental research done at home and abroad, it can be seen that most of the research focuses on the thermal mismatch problem caused by thermal mismatch of the film substrate, the buckling problem, and the influence of thickness ratio on the crack. The effect of Poisson's ratio of film and mismatch of material properties on pattern is still not satisfactory, so this topic has some research value. In this paper, EPDM was used as the substrate and the brittle film was tested. According to the experimental phenomena, a fracture model was proposed. In view of the fact that EPDM rubber was used on the substrate in the experiment, the brittle film was used to observe the crack shape easily. Six groups of uniaxial tensile tests with different thickness and two groups of biaxial tensile tests were carried out. Six groups of thin film substrate system samples with different thickness were used for uniaxial tensile test. The stress-strain data were selected as the first order derivation method, and the scattered data were observed. According to its characteristics, the fracture stress of the film is obtained by taking the average value. Through experiments, the fracture model is compared with the experimental data to verify the validity of the proposed model.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2
本文编号：2396519
[Abstract]:The phenomenon of film fracture in the film substrate system is very extensive. For example: crack of field, crack of road surface, crack of trunk, fracture of industrial coating, etc. Due to the large number of similar situations in real life, a variety of problems will follow, such as what causes the crack, what kind of law the shape of the crack, how to avoid the occurrence of the crack, how to repair the crack after the occurrence and so on. Therefore, the study of film fracture in thin film substrate system is of great significance. From the analysis of experimental research done at home and abroad, it can be seen that most of the research focuses on the thermal mismatch problem caused by thermal mismatch of the film substrate, the buckling problem, and the influence of thickness ratio on the crack. The effect of Poisson's ratio of film and mismatch of material properties on pattern is still not satisfactory, so this topic has some research value. In this paper, EPDM was used as the substrate and the brittle film was tested. According to the experimental phenomena, a fracture model was proposed. In view of the fact that EPDM rubber was used on the substrate in the experiment, the brittle film was used to observe the crack shape easily. Six groups of uniaxial tensile tests with different thickness and two groups of biaxial tensile tests were carried out. Six groups of thin film substrate system samples with different thickness were used for uniaxial tensile test. The stress-strain data were selected as the first order derivation method, and the scattered data were observed. According to its characteristics, the fracture stress of the film is obtained by taking the average value. Through experiments, the fracture model is compared with the experimental data to verify the validity of the proposed model.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2
【参考文献】
相关期刊论文 前1条
1 唐立强;孙旭光;;粘弹性—弹性材料界面上准静态扩展裂纹尖端的渐近场[J];哈尔滨工程大学学报;1996年01期
，本文编号：2396519
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