Fracture Observation in Puncture Impact Testing on Glass

User Benefits

- The system is capable of capturing images at up to 10 million frames per second, enabling detailed fracture observation on glass. � - The system is capable of testing at up to 20 m/s, sufficient to perform puncture impact testing on glass. �- The system helps to elucidate the mechanism of test results (of fracture).

Introduction

Glass has traditionally been used in a variety of industrial fields, including windows, lenses, and tableware. Among such glasses, chemically tempered glass produced with the ion-exchange method is used for the cover glass of smartphones. Since the surface of tempered glass is strengthened by compressive stress, the force leading to fracture may be greater than that of untempered glass. Even so, there is a possibility that the fracture of the entire glass may occur instantly, starting from a small scratch caused by an external impact. For this reason, research has been conducted to realize even greater strength and impact resistance. In this article, we introduce the results of fracture observation in a high speed puncture testing conducted on two types of tempered glass and untempered glass. The test results clarified that the maximum test force at the time of fracture increased if the glass was toughened, and that the maximum test force correlated with the number of cracks and the crack growth rate.

June 29, 2021 GMT