An experimental investigation on the damage of granite under uniaxial tension by using a digital image correlation method

作者：Yang, Ge; Cai, Zongxi^*; Zhang, Xiaochuan; Fu, Donghui

来源：Optics and Lasers in Engineering, 2015, 73: 46-52.

DOI：10.1016/j.optlaseng.2015.04.004

• Granite
• Tensile damage
• Strain localization
• Strain gradient
• Digital image correlation

This paper presents an experimental investigation of the damage mechanisms of granites under uniaxial tension. The displacement distribution and surface tensile strain of the specimens were measured by using a digital image correlation (DIC) method. A substantially large strain localization region emerged on the surface of the specimens before the tensile stress approached its ultimate value; subsequently, this strain localization region coincided with the final crack. Based on the measured tensile strain, a parameter was proposed to describe the average gradient of the tensile strain. This parameter was found to be much larger near the crack than in the other regions. Experimental results showed that the damage was related to the strain as well as to the strain gradient. These results may provide a practical foundation for a new gradient damage theory for rocks under tensile loading.

• 出版日期2015-10
• 单位天津大学; 天津商业大学