Creep Behavior of Polymer Thin Films Studied by Buldge Test

膨胀测试技术可以通过测量在薄膜圆窗上施加可控压力时形成的变形来确定聚合物薄膜的机械性能。设计了聚合物薄膜膨胀试验方法，并将其应用于各种聚合物薄膜。通过将压力-位移关系与简单力学模型进行比较，可以测量薄膜的弹性模量和破裂应力。通过胀体试验，可以清楚地观察到破裂时的大变形。虽然凸起测试技术是相当有效的，但由于包括试样安装和精确凸起高度测量在内的困难，这种技术并没有被常规使用。

The bulge testing technique can determine the mechanical properties of polymer thin films by measuring the deformation that forms in response to the application of a controlled pressure to a thin film circular window. The bulge testing for polymer thin film was designed and was applied to various polymer thin films. By comparing the pressure-displacement relation with a simple mechanical model, the elastic modulus and rupture stress in the thin film can be measured. Large deformation at rupture was clearly observed by buldge test. Though the bulge testing technique is quite effective, this technique is not routinely used because of difficulty including specimen mounting and precise bulge height measurement.