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<p>The study ascertains constitutive parameters of coal with emphasis on contact force characteristics and fracture patterns using experimental investigation technique “<i>swinging pendulum impact test</i>” and numerical modelling techniques finite element method and meshfree analysis. Investigation of constitutive parameters of coal gets of paramount importance for ensuring the safety of miners and the longevity of mining infrastructure. The experimental analysis features twenty-one impact tests with varying drop heights and impactor masses to understand and estimate the effect on contact force characteristics and fracture patterns in coal. Numerical modelling is carried out through two distinct approaches wherein finite element analysis is executed using commercial software package Abaqus and meshfree analysis is carried out through a self-developed coupled numerical model incorporating element free Galerkin analysis and the disturbed state concept. It was ascertained through experimental results that for variations of impactor drop height of 0.25&#xa0;m leads to an increase of 20-45% in impact force for different impactor mass and drop height. The fracture patterns exhibited tensile nature along with an enhancement in impact velocity ranging from 3.13&#xa0;m/s to 6.29&#xa0;m/s. Furthermore, the numerical analysis carried through finite element analysis and meshfree analysis depicted good accuracy with overall variation of less than 10% in impact force characteristics. However, the meshfree method-based results were excellent in predicting the overall impact force vs time trajectory along with provision of valuable insights for development and accumulation of micro-cracks in the specimen. The study asserts a novel and realistic approach to facilitate the evaluation of constitutive parameters and fracture patterns of coal to offer a prediction tool for assessing the effect of potential impact scenarios.</p>

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Estimation of impact force and fracture pattern characteristics of coal against low velocity impact loading

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • ILYAS BHAT,
  • S RUPALI,
  • ARVIND KUMAR

摘要

The study ascertains constitutive parameters of coal with emphasis on contact force characteristics and fracture patterns using experimental investigation technique “swinging pendulum impact test” and numerical modelling techniques finite element method and meshfree analysis. Investigation of constitutive parameters of coal gets of paramount importance for ensuring the safety of miners and the longevity of mining infrastructure. The experimental analysis features twenty-one impact tests with varying drop heights and impactor masses to understand and estimate the effect on contact force characteristics and fracture patterns in coal. Numerical modelling is carried out through two distinct approaches wherein finite element analysis is executed using commercial software package Abaqus and meshfree analysis is carried out through a self-developed coupled numerical model incorporating element free Galerkin analysis and the disturbed state concept. It was ascertained through experimental results that for variations of impactor drop height of 0.25 m leads to an increase of 20-45% in impact force for different impactor mass and drop height. The fracture patterns exhibited tensile nature along with an enhancement in impact velocity ranging from 3.13 m/s to 6.29 m/s. Furthermore, the numerical analysis carried through finite element analysis and meshfree analysis depicted good accuracy with overall variation of less than 10% in impact force characteristics. However, the meshfree method-based results were excellent in predicting the overall impact force vs time trajectory along with provision of valuable insights for development and accumulation of micro-cracks in the specimen. The study asserts a novel and realistic approach to facilitate the evaluation of constitutive parameters and fracture patterns of coal to offer a prediction tool for assessing the effect of potential impact scenarios.