scholarly journals Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

2020 ◽  
Vol 10 (15) ◽  
pp. 5314
Author(s):  
Hoyoung Jeong ◽  
Seungbeom Choi ◽  
Sudeuk Lee ◽  
Seokwon Jeon
Keyword(s):  
Numerical Simulation ◽  
Cutting Tool ◽  
Damage Model ◽  
Rock Cutting ◽  
Cumulative Damage ◽  
Cutting Process ◽  
Smooth Particle Hydrodynamics ◽  
Cutting Simulation ◽  
Brittle Behavior ◽  
Particle Hydrodynamics

Various numerical methods have been used to simulate the rock cutting process. Numerical simulation is a useful tool for estimating the performance of a cutting tool and for understanding the mechanism of rock cutting and interaction between a cutting tool and the rock. These methods supplement the rock cutting test, which is commonly referred to as the linear cutting machine (LCM) test. Mechanical excavators, such as roadheaders, longwall shearers, and trenchers, generally use pick cutters as the cutting tool. In this study, a rock cutting simulation with a pick cutter was developed using the smooth particle hydrodynamics (SPH) technique, which is a mesh-free Lagrangian method. The Drucker–Prager (DP) strength model was used to simulate the brittle behavior of rock. The cumulative damage (CD) model was used to simulate the degraded fragmentation process of rock and the distinctive behavior of rock in the compression and tensile stress regions. In this study, an attempt was made to simulate sequential cutting by multiple pick cutters. The results showed that the numerical simulation matched the experimental results closely in terms of cutter forces, specific energy, and the fragmentation phenomenon. These results confirmed the applicability of the SPH technique in simulating the rock cutting process.

Application of SPH in Numerical Simulation of Roadheader Hard Rock Cutting

2012 ◽  
Vol 619 ◽  
pp. 203-206
Author(s):  
Li Juan Zhao ◽  
Zhen Hua Zhou ◽  
Qing Zhong Guan ◽  
Zhen Tian ◽  
Xiao He Che
Keyword(s):  
Numerical Simulation ◽  
Dynamic Process ◽  
Failure Modes ◽  
Hard Rock ◽  
Rock Cutting ◽  
Rock Breaking ◽  
Smooth Particle Hydrodynamics ◽  
Particle Hydrodynamics

The yaw rock-breaking processes of roadheader single pick at different positions have been simulated by using LS-DYNA, and the dynamic process that pick-shaped cutters cut hard-rock has been analyzed with the technique of SPH(Smooth Particle Hydrodynamics). It has been found that separating rock into smooth particle hydrodynamics(SPH) units can effectively simulate and analyze deformation, damage and other phenomena of rock to lay a foundation of pick design, processing and failure modes analysis. The results of calculations show that this kind of new algorithm is feasible and effective to simulate rock penetration and pick mechanics problems.

A smooth particle hydrodynamic model for two-dimensional numerical simulation of Ti–6Al–4V serrated chip deformation based on TANH constitutive law

2018 ◽  
Vol 233 (9) ◽  
pp. 3004-3017 ◽  
Author(s):  
Weilong Niu ◽  
Rong Mo ◽  
Huibin Sun ◽  
Balachander Gnanasekaran ◽  
Yihui Zhu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Chip Formation ◽  
Cutting Forces ◽  
Damage Model ◽  
Smooth Particle Hydrodynamic ◽  
Chip Morphology ◽  
Constitutive Law ◽  
Cutting Process ◽  
Serrated Chip ◽  
Cutting Model

The saw-tooth chip formation is one of the main machining characteristics in cutting of titanium alloys. The numerical simulation of saw-tooth chip formation, however, is still not accurate, since most of these numerical simulation models are based on traditional finite element method, which have difficulties in handling extremely large deformation that always occurs in the cutting process. Furthermore, these models adopt the Johnson–Cook damage constitutive law that is implemented in commercial codes such as ABAQUS® and LS-DYNA® to describe the dynamic mechanical properties of material, but Johnson–Cook damage constitutive law cannot account for the material of behavior due to strain softening and the dynamic recrystallization mechanism that occurs in the cutting process of Ti–6Al–4. Therefore, this work introduces a material constitutive model named hyperbolic tangent (TANH) and an improved smooth particle hydrodynamics method, and then develops an improved cutting model for Ti–6Al–4V titanium alloy through our in-house code to predict saw-tooth chip morphology and cutting forces. When compared to the experiments and Johnson–Cook damage model, the improved cutting model better explains and predicts the shear localized saw-tooth chip deformation as well as cutting forces.

Computer Simulation of AISI D2 Orthogonal Cutting Using Finite Element Method

2012 ◽  
Vol 499 ◽  
pp. 39-44
Author(s):  
L. Yan ◽  
Feng Jiang ◽  
Y.M. Rong
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Cutting Tool ◽  
Orthogonal Cutting ◽  
Damage Model ◽  
Chip Morphology ◽  
Simulation Method ◽  
Cutting Process ◽  
Aisi D2 ◽  
Cutting Processes

This paper presented a finite element simulation model for the analysis of AISI D2 orthogonal cutting process using TiAlN coated inserts. Firstly, AISI D2 material constitutive model was built based on power law model, which was used in the FEM codes to describe the effect of strain, strain rate and temperature on the material flow stress. In modeling the chip formation, a damage model was employed to predict the chip separation. Then cutting edge radius and thickness of TiAlN coating of cutting tool were measured by SEM. Friction coefficients of cutting tool against AISI D2 steel were obtained by ball-on-plate friction tests on UMT-2 high speed tribometer. Finally, finite element simulations of AISI D2 orthogonal cutting processes were performed using AdvantedgeTM software. The simulated results of cutting forces and chip morphology showed good agreement with the experimental results, which validated the reliability of the cutting process simulation method.

scholarly journals Research on numerical simulation and intelligent computing of vehicle wading driving by smooth particle hydrodynamics method

2021 ◽  
Vol 2083 (4) ◽  
pp. 042091
Author(s):  
Wei Zhang ◽  
Peigang Jiao ◽  
Qinzhong Hou
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Engineering Application ◽  
Test Site ◽  
Theoretical Research ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Intelligent Computing ◽  
Simulation Process ◽  
Particle Hydrodynamics

Abstract The method based on Smooth Particle Hydrodynamics (SPH) is a meshless method which is widely used at present. Its advantage is that it can effectively improve the mesh distortion when finite element is used to deal with large deformation, and its particle characteristics are suitable to deal with the simulation problem of fluid. Based on the actual vehicle wading test site and the actual parameters of the vehicle, combined with the actual situation and theoretical basis, the SPH method is used for numerical simulation analysis of the vehicle wading problem. By comparing the simulation process with the actual water changes during wading, the feasibility of using SPH method in vehicle wading application is proved. In the simulation process of vehicle wading driving, under the condition of constant water level, by setting different wading speeds of vehicle, the flow law and change mechanism of water free surface are analyzed, which are of great significance in theoretical research and engineering application research.

scholarly journals Numerical simulation of rock cutting using YADE

2021 ◽  
Vol 342 ◽  
pp. 02011
Author(s):  
Antonios Kalogeropoulos ◽  
Theodoros Michalakopoulos
Keyword(s):  
Mechanical Characteristics ◽  
Cutting Tool ◽  
Rock Cutting ◽  
Cutting Process ◽  
Interaction Range ◽  
Initial Strength ◽  
Expected Performance ◽  
The Mean ◽  
Central Composite ◽  
Cylindrical Samples

Laboratory rock cutting tests are commonly used for the study of the cutting process and the evaluation of the expected performance of excavation machines. The cutting process is dominated by a great number of parameters, most of them relating with the intrinsic mechanical characteristics of the rock. In this study the open software Yade is used for simulating laboratory cutting tests on sandstone samples using a drag pick as the cutting tool. The process is simulated based on a conventional formulation, combined with an enhancement of the sample microstructure through the manipulation of the interaction range coefficient, which provides for the sample a very realistic initial strength ratio UCS/UTS. On cylindrical samples, four different cuts in four different paths were carried out. The mean cutting force for each cut was calculated and was chosen to represent the macroscopic response of the numerical model. The optimum set of microparameters is obtained through an experimental design with the Placket-Burman and Central Composite Design methods, and then optimized, in regard to the microparameters’ values, so that the rock cutting simulation is in close accordance with the observations from the actual laboratory cutting tests.

Computational of Orthogonal Metal Cutting Process Using Smooth Particle Hydrodynamics

2017 ◽  
Vol 867 ◽  
pp. 119-126
Author(s):  
S. Muthusamy ◽  
A Arulmurugu
Keyword(s):  
Finite Element ◽  
Cutting Force ◽  
Metal Cutting ◽  
Cutting Speed ◽  
Cutting Process ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Smooth Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Sph Model

In modern years, simulating metal cutting process used in Finite element method (FEM). The cutting force is used to identify the excessive friction of machining interface and worn out tool. Optimization of machining parameters are used to maintain the precision of the component, power consumption minimized and tool wear reduced. The current project presents the simulated Finite Element SPH Model used for predict the cutting force and associate with experimental confirmation while turning the AA2219-TiB2/ZrB2 metal matrix composites (MMC). Smooth Particle Hydrodynamics (SPH) machining simulation was carried out using a Lagrangian finite element based machining model to predict the cutting force. The turning simulation operation carried out using ANSYS AUTODYN (SPH) software. Machining parameters are cutting speed, feed rate and depth of cut. The results predicted from the SPH analysis virtually close to the results attained from the experimental work. Simulation of machining test using SPH model is preferred over actual cutting test because of it reduce cost and time.

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