Work

Mechanical properties and energy evolution of thermally damaged red sandstone in high-strain-rate impact tensile tests: Experimental and theoretical analyses

Year: 2024

Type: article

Abstract: The dynamic tensile strength of rocks affects structural stability in geotechnical applications requiring thermal resilience. This study employs a large-diameter (Φ75 mm) split Hopkinson tension bar ( SHTB ) to perform high-strain-rate tensile tests on red sandstone specimens subjected to thermal treatments at temperatures up to 1200 °C. However, specimens heated to 1200 °C transitioned to an amorphous melt phase, making tensile tests infeasible. The novel large-diameter SHTB technique improves the test efficiency by using double reinforcement and an adhesive to attach the specimen to the bar. An energy-based damage variable and a comprehensive rock brittleness index are used to assess the effects of the strain rate and thermal conditions on the specimens' mechanical behavior and energy dissipation . Further, an innovative dissipated energy model ( T II ) describes the intrinsic nonlinearities of the rock's dissipated energy dynamics and their crucial influences on the pre-peak stress responses. A dual-threshold model is utilized to describe thermal strengthening or weakening, revealing fundamental insights into the energy mechanics of rock failure, which are vital for the integrity of high-temperature geotechnical systems.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.08.202

Authors: Shaoxu Hao, Yue Zhai, Shi Liu, Yu Jia

Institutions: Chang'an University, Jinan University, China University of Mining and Technology, State Key Laboratory for Geomechanics and Deep Underground Engineering

Language: English

Topic: Rock Mechanics and Modeling

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,430