Abstract: In this paper, based on the Brazilian splitting principle under static load, the SHPB splitting test of rubber cement mortar was carried out, and the dynamic mechanics, energy characteristics, and failure mechanism of rubber cement mortar under the SHPB splitting test were studied. Based on damage mechanics, the effects of rubber content, curing humidity, and impact load on dynamic splitting damage of cement mortar were analyzed from the point of view of strength and energy, and six damage paths under three damage factors were discussed.Combined with the fai-lure modes of disc specimens, a simplified plane ideal force model of impact splitting was established. Two different dynamic splitting fracture forms on fracture form-Ⅰ and fracture form-Ⅱ were analyzed and the failure mechanism of disk specimen under fracture form-Ⅱ was discussed preliminarily. The above research results showed that the addition of rubber and the decrease of curing humidity have a great negative effect on the dynamic splitting tensile strength of cement mortar. Normal cement mortar disc specimens and rubber cement mortar disc specimens have the same evolution trends of stress rate and strain rate. The addition of rubber particles and the decrease of curing humidity hinders the transfer of energy in cement mortar disc specimens to some extent. The dynamic splitting damage of cement mortar disc samples caused by different single damage factors and different compound damage factors is different. Under higher impact pressure, the disk specimen is likely to be destroyed by the formation of “triangular crushing zone”, “splitting tensile zone” and “bending fracture zone”. Finally, the effect of ITZ on the strength and impact resistance of rubber cement mortar under SHPB splitting was analyzed from a mesoscopic point of view.
杨荣周, 徐颖, 陈佩圆, 王佳. SHPB劈裂试验下橡胶水泥砂浆的动态力学、能量特性及破坏机理试验研究[J]. 材料导报, 2021, 35(10): 10062-10072.
YANG Rongzhou, XU Ying, CHEN Peiyuan, WANG Jia. Experimental Study on Dynamic Mechanics, Energy Characteristics, and Failure Mechanism of Rubber Cement Mortar Under SHPB Splitting Test. Materials Reports, 2021, 35(10): 10062-10072.
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2021, Vol. 35 
