Mode Ⅰ dynamic fracture toughness of rubberised concrete using a drop hammer device and split Hopkinson pressure bar

2022 ◽  
pp. 103995
Author(s):  
Wanhui Feng ◽  
Yunchao Tang ◽  
Weiming He ◽  
Wenbo Wei ◽  
Yongmin Yang
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Fracture Toughness ◽  
Hopkinson Pressure Bar ◽  
Drop Hammer ◽  
Split Hopkinson ◽  
Pressure Bar

scholarly journals Dynamic fracture and energy consumption characteristics of coal-series sandstone after heat treatment

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 967-974
Author(s):  
Ming Li ◽  
Lin Gang ◽  
Xianbiao Mao
Keyword(s):  
Heat Treatment ◽  
Energy Consumption ◽  
Dynamic Fracture ◽  
Split Hopkinson Pressure Bar ◽  
Test System ◽  
Test Results ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Loading Tests ◽  
Pressure Bar

In this paper, the dynamic loading tests of sandstone after heat treatment at 25-800?C are carried out by using the split Hopkinson pressure bar test system. Combined with the theory of energy dissipation, the dynamic fracture and energy consumption characteristics of coal-series sandstone are systematically studied. The test results illustrate that the dynamic fracture and energy consumption characteristics of sandstone are mainly related to the changes of internal moisture and cementing materials.

scholarly journals The dynamic asymmetric fracture test and determination of the dynamic fracture toughness of large-diameter cracked rock specimens

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 897-905
Author(s):  
Yiqiang Lu ◽  
Mingzhong Gao ◽  
Bin Yu ◽  
Cong Li
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
Split Hopkinson Pressure Bar ◽  
Impact Load ◽  
Failure Process ◽  
Large Diameter ◽  
Dynamic Stress Intensity Factor ◽  
Dynamic Fracture Toughness ◽  
Hopkinson Pressure Bar ◽  
Rock Specimens

We propose large-diameter (160 mm) pre-cracked chevron notched Brazilian disc (P-CCNBD) specimens were used to study the asymmetric fracture law and determine the dynamic fracture toughness of rock. Specimens were diametrically impacted by a split Hopkinson pressure bar. The dynamic fracture failure process of each specimen was monitored by crack propagation gauges and strain gauges. Each of the large-diameter P-CCNBD specimens was found to exhibit prominent asymmetric fracture under impact load. The stress equilibrium condition cannot be satisfied. The dynamic fracture toughness values of the rocks were measured using the experimental-numerical method rather than the quasi-static method. The calculation results showed that the dynamic fracture toughness of rocks increases with the dynamic loading rate. In addition, at the 3-D crack front, the dynamic stress intensity factor was found be substantially different at each point. These data suggest that the dynamic fracture toughness of P-CCNBD specimens should be calculated by removing the value affected by an edge arc crack and taking the average value of the remaining points.

scholarly journals Rock Dynamic Fracture Characteristics Based on NSCB Impact Method

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yanbing Wang
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
High Speed ◽  
Loading Rate ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Fracture Toughness ◽  
High Speed Photography ◽  
Rate Dependency ◽  
Hopkinson Pressure Bar ◽  
Rock Materials

In 2012, the International Society for Rock Mechanics (ISRM) recommended a new Notched Semicircular Bend (NSCB) method for the determination of dynamic fracture toughness of rock materials, but it did not consider the effect of some uncontrollable factors in the course of the experiment on the test result. This thesis firstly carried out dynamic fracture toughness experiments on several typical rock materials such as sandstone using the modified Split-Hopkinson Pressure Bar (SHPB) experimental system with high-speed photography, directly compared the dynamic fracture failure characteristics of several rock materials, and examined the loading rate dependency of the dynamic fracture toughness of rock materials. Based on the numerical analysis method of Discrete Lattice Spring Model (DLSM), it focused on the effect of bullet impact loading rate, loading area of incident bar, support restraints of clamping specimen, and other uncontrollable factors in the course of SHPB experiment on test results. The findings can be referenced for the improvement of NSCB method.

Sign in / Sign up

Export Citation Format

Share Document