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金属薄膜/聚合物基底(尤其是温度敏感型的聚合物)结构在外力和加热影响下的力学性能变化直接影响到器件的功能和使用寿命。通过光学显微镜原位观察钛膜/有机玻璃基底结构在力-热(20~44℃)耦合作用下的薄膜表、界面响应。在外部轴向压力作用下,薄膜会发生垂直于加载方向的屈曲。保持试件的加载端边界位移不变,对其进行加热,薄膜会出现垂直于屈曲方向的横向裂纹。通过分析发现薄膜产生横向裂纹的原因为:力-热耦合作用促使聚合物基底在非加载端方向的拉应变增大。在不同长度的薄膜裂纹段上,较长裂纹段中心部位上受到基底传递的拉应力较大,产生再次断裂的可能性较高。
Metal film / polymer substrate (especially temperature-sensitive polymer) structure under the influence of external forces and heating changes in mechanical properties directly affect the function and life of the device. In-situ observation of the film surface and interface response of titanium film / plexiglass substrate structure under the condition of force-heat (20 ~ 44 ℃) coupling was observed by light microscope. Under external axial pressure, the film will buckle perpendicular to the loading direction. Maintaining the displacement of the loading end of the specimen unchanged, the film is heated and the film will show transverse cracks perpendicular to the buckling direction. The reason for the transverse cracking of the film was found by the analysis that the force-thermal coupling causes the tensile strain of the polymer substrate in the non-loading end direction to increase. In the different length of the film crack segment, the center of the longer crack segment by the substrate transmission of the larger tensile stress, resulting in a higher probability of re-fracture.