A study of the mechanical response of polycrystalline ice subjected to dynamic tension loading using the spalling test technique

Abstract

The spalling test technique is conducted to study the dynamic tensile strength of polycrystalline ice. • The results show the sensitivity of the tensile strength to the applied strain rate (from 41 s − 1 to 271 s − 1).

Validation of the photomechanical spalling test in the case of non‐linear dynamic response: Application to a granite rock

“…The experimental arrangement is presented in Figure 1 and is designed based on principles already presented in previous works. [ 11,12,15,21 ] It is composed of a single instrumented Hopkinson bar made out of an aluminium alloy of high yielding strength (≤ 450 MPa) with an Young's modulus of 72 GPa. The input bar geometry was designed to have negligible wave dispersion effects and is 1.2 m in length and 45 mm in diameter.…”

“…If both loading stages are measured, the information on the material compressive response (often assumed to be elastic) and its successive tensile response can be characterised in only one test. The simplicity, easy installation and straightforward application of the spalling set‐up has made it to be widely used for tensile testing of rock‐like and concrete‐like materials (e.g., previous studies [ 6‐12 ] ). However, the experimental information obtained from one test using conventional pointwise measurement tools (i.e., strain gauges and laser interferometers) is limited.…”

Influence of Porosity on Ice Dynamic Tensile Behavior as Assessed by Spalling Tests

“…During a such impact, an intense fragmentation develops in the hailstone due to dynamic tensile loading at high strain-rates which influences the mechanical loading transmitted to the impacted structure. Up to now, the work of Saletti et al (2019) is the only survey providing a robust and reproductible set of experiments about the dynamic tensile strength of ice, however the microstructure influence was out the scope of this experimental study.Though, the hailstone microstructures are generally charaterised by a high level of porosity. It is the reason why the influence of this microstructural parameter on the dynamic behavior of polycrystalline ice needs to be investigated.…”

“…It is the reason why the influence of this microstructural parameter on the dynamic behavior of polycrystalline ice needs to be investigated. The aim of this paper is to study the role of porosity on the tensile behavior of polycrystalline ice by applying the same experimental set-up and measurements processing than in Saletti et al (2019) to low-porosity (LP) and high-porosity (HP) microstructures. To do so, spalling tests with a Hopkinson bar apparatus were conducted and fragmentation processes were carefully analyzed by means of an Ultra High Speed Camera, an Automatic Ice Texture Analyser and a micro-Computed Tomograph.…”

“…During a such impact, an intense fragmentation develops in the hailstone due to dynamic tensile loading at high strain-rates which influences the mechanical loading transmitted to the impacted structure. Up to now, the work of Saletti et al (2019) is the only survey providing a robust and reproductible set of experiments about the dynamic tensile strength of ice, however the microstructure influence was out the scope of this experimental study.…”