多裂纹干涉的数字全息实验研究

Research the interaction of collective cracks with digital holography

本文利用自主开发的数字全息干涉实验系统测量了不同方位和构型裂纹的变形场。根据干涉条纹的数量和分布分析了裂纹间的干涉情况。结果表明裂纹干涉对裂纹的启裂影响不大,但会在裂纹之间形成高应力应变区,改变裂纹的扩展路径,推动裂纹之间的串接,影响材料的损伤演化。

The deformation fields of cracks for different orientation and configure have been measured with the help of the digital holographic interferometry system that was developed by us. The interaction among cracks has been studied based on the distribution and the magnitude of interference fringes. It Can be concluded that the initiation of crack will not be affected obviously by the interaction, on the other hand, the amplification effect among cracks will mainly lead to high strain field, vary the propagation path of crack and propel the connection among cracks, and finally affect the damage evolution of materials.