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利用显微数字散斑相关方法(DSCM)对新型高分子薄膜材料力学性能进行了研究。通过实时获取高精度的变形位移场,得到应变场与力学性能之间的关系,实现了新型高分子薄膜的力学性能分析。利用该方法对聚酰亚胺-二氧化硅合成薄膜进行面内位移测量,由薄膜的应力-应变曲线完成了薄膜材料的弹性模量测量;将离面位移的测量转化为面内位移的测量,对聚氨酯-钛酸钡复合高分子材料的电致伸缩应变进行了测量,从而获得电致伸缩系数,实现了材料的电致伸缩性能分析。采用亚像素搜索和曲面拟合相结合的方法进行数据处理,并对结果进行了分析。研究结果表明,数字散斑相关方法为研究新型薄膜材料动静态力学性能与物理性能提供了一种有效的、可行的方法。
The mechanical properties of novel polymeric thin films were studied by using the digital speckle correlation method (DSCM). Through the real-time acquisition of high-precision deformation and displacement field, the relationship between strain field and mechanical properties was obtained, and the mechanical properties of the new polymer films were analyzed. The in-plane displacement measurement of the polyimide-silica composite film was carried out by this method. The elastic modulus of the film material was measured from the stress-strain curve of the film. The measurement of the out-of-plane displacement was transformed into the measurement of the in-plane displacement , The electrostrictive strain of polyurethane-barium titanate composite material was measured to obtain the electrostrictive coefficient, and to achieve the electrostrictive property analysis of the material. Subpixel search and surface fitting methods were used to process the data and the results were analyzed. The results show that the digital speckle correlation method provides an effective and feasible method for studying the dynamic and static mechanical properties and physical properties of the novel thin film materials.