Effect of stress pulse shape on the dynamic fracture of soda-lime glass

Jaroslav Buchar,Jan Trnka,F Gálvez Díaz-Rubio,D.A Cendón Franco

doi:10.1051/epjconf/202125006001

Abstract

The goal of this paper is to evaluate the tensile strength and fracture behavior of the soda lime glass under static and dynamic loading using Brazilian tests. The evaluation of the static tensile strength was performed using the universal testing machine; the fracture behavior under dynamic loading was studied using the Hopkinson Split Pressure Bar (HSPB) Technique. The dynamic loading is realized using the stress pulses of the different shape. In order to obtain the different loading stress pulses impact strikes made from four different materials (Steel, Teflon, Beech, and Polymer) were used. The high-speed camera in both static and dynamic tests was used to obtain some detail view on the failure process of specimens. Experimental results showed that the dynamic tensile strength was at least three times higher than the static one. The initiation of the dynamic fracture occurs when some parameters of the loading stress pulse reaches critical values. These parameters are independent on the stress pulse shape.

Highlights

IntroductionThe knowledge of the fracture properties of glass play significant role in the planning of their use in many practical application when e.g. glass windows are especially vulnerable to shock and impact loading
The knowledge of the fracture properties of glass play significant role in the planning of their use in many practical application when e.g. glass windows are especially vulnerable to shock and impact loading. This kind of loading involves many accidents like terrorist bombing attack, gas explosion, debris impact during windstorm [1] and many others events. This is the reason of the study of the glass and many other brittle materials failure behavior under high loading rates corresponding to the problems mentioned above
During the all tests no force equilibrium in the specimen was achieved. This fact was documented by observation of the fracture behavior using high speed camera

Summary

Introduction

The knowledge of the fracture properties of glass play significant role in the planning of their use in many practical application when e.g. glass windows are especially vulnerable to shock and impact loading This kind of loading involves many accidents like terrorist bombing attack, gas explosion, debris impact during windstorm [1] and many others events. The evaluation of the stress state in the specimen is very easy during of the static loading under assumption of the pure elastic behavior of the specimen up to the fracture This method was extended for the dynamic loading using HSPB technique [4]. The glass dynamic fracture was studied in papers [7,8,9,10], where the main characteristics of this process were obtained

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Results

Conclusion