Particle Velocity in Abrasive Waterjets

2020 ◽  
pp. 135-144
Author(s):  
Michael Lo ◽  
Axel Henning ◽  
Kevin Hay ◽  
Peter Miles
Keyword(s):  
Particle Velocity ◽  
Abrasive Waterjets

A Model for Abrasive-Waterjet (AWJ) Machining

1989 ◽  
Vol 111 (2) ◽  
pp. 154-162 ◽  
Author(s):  
Mohamed Hashish
Keyword(s):  
Flow Stress ◽  
Particle Velocity ◽  
Experimental Results ◽  
Depth Of Cut ◽  
Dynamic Flow ◽  
Erosion Model ◽  
Wear Mode ◽  
Abrasive Waterjets ◽  
Cutting Model ◽  
Awj Cutting

Ultrahigh-pressure abrasive-waterjets (AWJs) are being developed as net shape and near-net-shape machining tools for hard-to-machine materials. These tools offer significant advantages over existing techniques, including technical, economical, environmental, and safety concerns. Predicting the cutting results, however, is a difficult task and a major effort in this development process. This paper presents a model for predicting the depth of cut of abrasive-waterjets in different metals. This new model is based on an improved model of erosion by solid particle impact, which is also presented. The erosion model accounts for the physical and geometrical characteristics of the eroding particle and results in a velocity exponent of 2.5, which is in agreement with erosion data in the literature. The erosion model is used with a kinematic jet-solid penetration model to yield expressions for depths of cut according to different modes of erosion along the cutting kerf. This kinematic model was developed previously through visualization of the cutting process. The depth of cut consists of two parts: one due to a cutting wear mode at shallow angles of impact, and the other due to a deformation wear mode at large angles of impact. The predictions of the AWJ cutting model are checked against a large database of cutting results for a wide range of parameters and metal types. Materials are characterized by two properties: the dynamic flow stress, and the threshold particle velocity. The dynamic flow stress used in the erosion model was found to correlate with a typical modulus of elasticity for metals. The threshold particle velocity was determined by best fitting the model to the experimental results. Model predictions agree well with experimental results, with correlation coefficients of over 0.9 for many of the metals considered in this study.

scholarly journals Mathematical Models for the Hydrodynamic Characteristics of Abrasive Waterjets

2005 ◽  
Vol 291-292 ◽  
pp. 459-464
Author(s):  
Jun Wang ◽  
H. Liu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Mathematical Models ◽  
Particle Velocity ◽  
Predictive Models ◽  
Numerical Study ◽  
Abrasive Waterjet ◽  
Hydrodynamic Characteristics ◽  
Abrasive Waterjets ◽  
Particle Characteristic

Predictive models for the particle velocity in an abrasive waterjet (AWJ) are developed following a CFD (computational fluid dynamics) study. A numerical study is then carried out to assess the models. It is shown that the predictive models can adequately predict this particle characteristic in an AWJ.

Analysis of Electron and Heavy Particle Velocity Distribution under Consideration of Non-thermal Equilibrium Arc

2019 ◽  
Vol 139 (9) ◽  
pp. 562-567
Author(s):  
Yusuke Nemoto ◽  
Soshi Iwata ◽  
Yoshifumi Maeda ◽  
Toru Iwao
Keyword(s):  
Velocity Distribution ◽  
Particle Velocity ◽  
Thermal Equilibrium ◽  
Heavy Particle

Particle velocity measurement in powder gas jets of coaxial powder nozzles for laser material deposition

2021 ◽  
Vol 33 (1) ◽  
pp. 012019
Author(s):  
Jonathan Schaible ◽  
Luis Andrea Hau ◽  
David Weber ◽  
Thomas Schopphoven ◽  
Constantin Häfner ◽  
...  
Keyword(s):  
Particle Velocity ◽  
Velocity Measurement ◽  
Laser Material ◽  
Gas Jets ◽  
Material Deposition ◽  
Particle Velocity Measurement

scholarly journals Research of the Technical Seismicity Due to Blasting Works in Quarries and Their Impact on the Environment and Population

2021 ◽  
Vol 11 (5) ◽  
pp. 2118
Author(s):  
Jan Feher ◽  
Jozef Cambal ◽  
Blazej Pandula ◽  
Julian Kondela ◽  
Marian Sofranko ◽  
...  
Keyword(s):  
Particle Velocity ◽  
Normative Values ◽  
Internal Environment ◽  
Negative Effects ◽  
Vibration Acceleration ◽  
Limit Values ◽  
Vibration Intensity ◽  
Timing Interval ◽  
Millisecond Timing ◽  
The Impact

Vibrations caused by blasting works have an impact not only on buildings but also the internal environment of the buildings. If these buildings are situated in the surroundings of quarries, the citizens can perceive these vibrations negatively. By applying an appropriate millisecond timing interval, it is possible to lower the intensity of vibrations to the levels that the citizens will not perceive as negative effects inside the buildings. The limit values for this vibration intensity have not been defined to date. For the protection of the building from the vibrations, normative values of the particle velocity and frequency were determined. Hygienic standards for the inhabitants of the housing were applied, which assessed the impact of the vibration on humans through the measurement of the vibration acceleration in the housing. In this article, the results of the research carried out in Trebejov Quarry are presented. The experimental blasts carried out in Trebejov Quarry proved that the reduction in the vibration intensity under the value 2 mm.s−1 led to the satisfaction of the inhabitants.

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