Department of Mechanical Engineering, Yale University, New Haven, CT 06511, USA.
Proc Natl Acad Sci U S A. 2010 Aug 24;107(34):14964-7. doi: 10.1073/pnas.1005537107. Epub 2010 Aug 9.
Colloidal coatings, such as paint, are all around us. However, we know little about the mechanics of the film-forming process because the composition and properties of drying coatings vary dramatically in space and time. To surmount this challenge, we extend traction force microscopy to quantify the spatial distribution of all three components of the stress at the interface of two materials. We apply this approach to image stress near the tip of a propagating interface crack in a drying colloidal coating and extract the stress intensity factor.
胶态涂层，如油漆，在我们周围随处可见。然而，由于干燥涂层的组成和性质在空间和时间上都有很大的变化，因此我们对成膜过程的力学机制知之甚少。为了克服这一挑战，我们扩展了牵引力显微镜，以定量测量两种材料界面处应力的所有三个分量的空间分布。我们将这种方法应用于图像中干燥胶态涂层中传播界面裂纹尖端附近的应力，并提取应力强度因子。
