EXPERIMENTAL STUDIES ON TENSILE STRESS STRAIN RELATION OF SOFT COAL

A test set up for measuring tensile stress strain relation and tensile strength of soft coal or soil is proposed A ring shaped coal sample pressed from coal powder is lined with a pressurized water bag When the water pressure increases to a certain value, the coal sample in circumferential tension breaks down Systematic experiments have been done to show the tensile stress strain relation of the pressed coal sample with various sample density and pore pressure The stress strain relation ...