Abstract:Brazilian disc is popular sample used for the measurement of tensile properties of brittle materials like marble. In order to study the laws of the failure strains after temperature treatment under dynamic tension, the dynamic split tests of a series of Brazilian disc of marble were performed using split Hopkins pressure bar(SHPB) of 100 mm diameter. The failure strains of all types of samples in different strain rate were obtained with strain gauges stuck on the center of the sample and the test results indicated that the failure strains of all types of samples are increased with the increment of the strain rate, and the failure strains of marble without heat treatment (type A) and those with a constant temperature treatment at 50 ℃(type 50A) are increased slightly while those with a constant temperature treatment at 100 ℃(type 100A) are increased remarkably and the increment is bigger than that of type A and type 50A. The failure strains of the samples with a constant temperature treatment at 50 ℃ are similar with those without any heat treatment, and after the constant temperature treatment at 100 ℃ the failure strains are more than those of the others types. The failure strains and the strain rates are increased gradually with the increment of projectile speed, and when the speeds are in the same level, the failure strains and the strain rates of the samples with the constant temperature treatment at 100 ℃ are higher than those of the others, and the difference between them are increased gradually with the increment of the speed.