【摘要】 数字图像方法 (DIC)具有非接触、高精度、全场测量的优点,适用于橡胶材料大变形力学问题的实验研究。散斑作为试件变形信息的载体,制作高质量的散斑对于DIC尤为重要。本文对散斑进行了多参数数字设计,采用MIG法和MIOSD法对设计的数字散斑进行了评价和优选;提出了一种基于粘附力的无损散斑移转技术,将散斑便易可靠地移转到试件表面,可以随橡胶材料发生大变形而不脱落;采用数字设计散斑和无损移转的数字图像技术,对一类橡胶的I型断裂问题进行了研究,实验得到了裂尖场存在径向奇异分层和环向变形分区特性;实验结果表明数字设计散斑的DIC技术在橡胶材料断裂问题的实验研究具有良好的适应性和应用前景。更多还原

【Abstract】 Digital image correlation(DIC) has the advantages of non-contact, high accuracy and full field measurement,and is suitable for experimental research on large deformation mechanics of rubber materials. Since speckle is the carrier of deformation information, making high quality speckle is particularly important for DIC. In this paper, the multi parameter digital design of speckle is carried out. The design of digital speckle is evaluated and optimized by MIG and MIOSD.A nondestructive speckle transfer technique based on adhesion force is put forward to move the speckle to the surface of the specimen easily and reliably. The I type fracture analysis of a class of rubber is studied by digital image correlation technique with speckle and nondestructive transfer. The experimental results show that the crack tip field has the characteristics of radial singular stratification and circumferential deformation. The experimental results show that the digital design speckle based DIC technology has good adaptability and application prospect in the experimental study fracture analysis of rubber material.更多还原