中文摘要：

研究了不同多孔结构聚乙烯醇水凝胶的微观形貌,采用数字散斑相关技术和力学实验测试等对多孔水凝胶在受力状态下的微区位移、压缩模量及泊松比进行分析和计算。研究发现,多孔水凝胶的孔隙率和孔径大小对形变等位移线分布有明显影响。随着致孔剂含量的增加,多孔水凝胶的等位移线由均匀分布的近似平行线变为不均匀的S形曲线,出现等位移线密度明显增大的应力集中区域。多孔水凝胶孔隙率增加,形变增大。致孔剂种类及含量不同时,水凝胶的泊松比值随着载荷的增加逐渐减小,致孔剂含量越多泊松比值越小,压缩模量则随着应变的增加逐渐增大。

英文摘要：

The micro-morphologies of porous poly（vinyl alcohol）（PVA） hydrogel with different porous structures were observed.The digital speckle correlation method（DSCM） connected with mechanical properties test was used to investigate the deformation of porous hydrogel.The deformation of micro-fields,compressive modulus and Poisson＇s ratio of porous hydrogel were compared under different compressive loads.The pore size and porosity of different structures significantly affect the distribution of iso-displacement lines.It is revealed that the iso-displacement lines are equality and approximately parallel in hydrogels with unconnected porous structure,but are tortuous and ＂S＂ like in hydrogels with connected porous structure.The field,in which the iso-displacement lines are intensive,is the area of stress concentration.The deformation is increased with adding porosity.The Poisson＇s ratio of hydrogel is decreased with increasing of load and content of porogen.The compression modulus is increased with increasing of the strain.