Effect of End-Face Friction on Compression Strength of Glass

Abstract

Abstract: In order to study the effect of end-face friction on the compression strength of glass, copper foil and vaseline were used to reduce friction on the compression contact face. Quasi-static compression tests at the strain-rate of 10^-4 s^-1 were carried out on soda-lime-silica samples using the MTS testing machine. High-speed photography was used to record the failure process of the glass samples. The statistical distribution of glass strength was further analyzed. The experimental results show that when the contact surface of the glass sample is only lubricated by vaseline, the significant cracks and surface fragments fall off during the compression process. After the copper foil is added to the contact surface of the glass sample, the force is uniform throughout the compression process, and no significant cracks or fragments fall off. The decrease of the friction force of the end-face will lead to a significant decrease in the compression strength of the glass, mainly because reducing the friction force weakens the lateral restraint on the end of the specimen, and the specimen is in a state closer to uniaxial stress, which largely avoids the strengthening effect caused by confining pressure.

Key words: glass, compression strength, end-face friction, failure process, transverse constraint

CLC Number:

LU Huacheng, XIONG Xuemei, ZHONG Donghai, ZHENG Yuxuan, ZHOU Fenghua. Effect of End-Face Friction on Compression Strength of Glass[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3511-3515.

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