Chapter 10. Response and Characterization of Confined Borosilicate Glass: Intact and Damaged

Summary

The objective of this work is to determine the fundamental compression response of borosilicate glass and obtain an improved understanding of the transition from intact to damaged material to aid in glass modeling efforts. Compression experiments were conducted on borosilicate glass under confinement. An experimental technique developed for ceramics¹ is applied to glass specimens to obtain comminuted glass material by in-situ failure of intact or pre-damaged (by thermal shock) samples. Emphasis is on development of the experimental technique and application of additional diagnostics to characterize the response of comminuted glass. The glass samples (intact or pre-damaged) were inserted in a high-strength steel confining sleeve, and then loaded and re-loaded at quasistatic strain rates to fail the material in-situ. Multiple load/reload cycles were applied at successively increasing compressive loads. Strain gages mounted on the outer diameter of the confinement sleeve were used to measure hoop strain. Differences in the response of intact vs. pre-damaged glass material are evaluated and presented. Interpretation of the results within a constitutive model for borosilicate glass is presented in a companion paper by Chocron, et al.²