Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates. (3rd September 2018)

• Record Type: Journal Article
• Authors: Wu, Nan; Zhu, Zhende; He, Zhilei
• Other Names: Riccio Aniello Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2018(2018)
• Publication Date: 2018-09-03
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2018/5241848
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : In this paper, an experimental study was carried out on a rock-mortar interface specimen under three different strain rates (10 − 6, 10 − 5, and 10 − 4 s − 1 ) using the MTS322 electrohydraulic servo loading system, and a new constitutive relation function of fictitious crack model (FCM) according to the axial-stress-crack-width curves of the rock-mortar interface is established, because the traditional nonlinear softening function easily distorts, shakes, and so cannot describe the damage-evolution process of the rock-mortar interface accurately. Through the use of a precise servo actuator system and three extensometers measured axial-stress-crack-width curves, it is shown that the rock-mortar interface is very sensitive to the strain rate. The tensile strength increases with strain rate, the crack width decreases at the same time, and the axial-stress-crack-width curves gradually evolve from a concave-downward trend to a linear decreasing trend. At the same time, the new constitutive relation function can reflect the tensile strength, crack width, and the downward trend of the rock-mortar interface more accurately.