Erosion Wear Characteristics of Rock Eroded Using Abrasive Air Jet at 90° Impingement Angle

Author(s):  
Yong Liu ◽  
Jiaojiao Wu ◽  
Jianping Wei ◽  
Tianxuan Hao ◽  
Xiaotian Liu

This work focused on erosion behaviour of pure polyester, aroma skin (5wt%) and biochar (7.5wt%) reinforced polyester composites. The hand-layup method is used to develop the composite plate. To investigate the erosion wear rate of the developed composite plates, the sized specimen is subjected to erosion studies. As per ASTM G76 the erosion test was done with the help of air jet erosion tester. To study the parameters of different reinforcement, impingement angle and impact velocity of the fabricated specimen. The erosion behaviour of particulate reinforced polyester composites is evaluated at two different reinforcement (aroma skin and biochar) and three different wt% (0wt%, 5wt% and 7.5wt%) at varying impingement angles (30o , 45o , 60o and 75o ) for regular time intervals. The standoff distance, impact velocity and erodent discharge rate were kept constant. Alumina oxide is used as erodent material with the size of 50µm. From the result, it is observed that increase in impingement angle increase the erosion rates. Another observation is made that addition of reinforcement in matrix material also shows increase in wear rate of composite. In comparison of both aroma skin and biochar reinforced polymer composites, biochar enhances the erosion resistance of composite in all impingement angles.


2021 ◽  
pp. 152808372110642
Author(s):  
Sachin Tejyan

Abrasive particle-induced erosive wear of polymeric engineering components is a major industrial issue. The research of solid particle erosion characteristics of polymeric composites becomes essential due to operational needs in dusty conditions. Nonwovens are now employed in industrial applications for polymeric composites. Nonwoven products are made from a wide range of raw materials, ranging from synthetic to natural fibers. This work finding the effect of nonwoven cotton fiber (5, 10, and 15 wt.%) loading on the physical, mechanical, and erosion wear of fixed wooden dust (4 wt.%) filled hybrid epoxy composites. Experimental results reveal improved impact strength, hardness, and compressive and tensile strength with an increment of fiber loading from 5–15 wt.%. The density of the composites was found to increase, whereas void content decreases with an increase in cotton fiber. The erosion wear of the composites has been studied using an L27 orthogonal array to assess the effects of various parameters such as fiber loading, erodent size, impact velocity, impingement angle, and stand-off distance. The erosion wear increased with impact velocity and remained highest for 60° of impingement angle. The most significant parameter affecting the erosion wear was determined as impact velocity followed by impingement angle. Surface morphologies of eroded samples reveal the fiber pull-out, and fiber breakage was the prominent phenomenon for the erosion wear of the evaluated composites.


2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yuanbo Chu ◽  
Zhaohui Yuan ◽  
Wenchao Chang

The nozzle flapper pressure servo valve is a kind of high-precision hydraulic component that can be widely used in the aircraft brake system. In actual service, the dynamic erosion wear behavior will occur at the pilot stage because of the gradual contamination of oil and the variable distance between nozzle and flapper. For this purpose, the paper proposes a dynamic erosion wear characteristics analysis and service life prediction method in which firstly the structural feature and working principle of the nozzle flapper pressure valve are analyzed using the brake cavity as the load blind cavity. Secondly, the dynamics simulation model and the performance experiment system of the pressure valve are separately constructed, and then the validation of the constructed model is conducted by contrasting the results between simulation and experiment. Finally, the mathematical models of the degradation process induced by the dynamic erosion wear are established, and then the dynamic erosion wear characteristics under dynamic structural distance and contamination conditions are analyzed, which are combined with the failure threshold value determined by the dynamics simulation to finish the service life prediction of the nozzle flapper pressure servo valve.


2017 ◽  
Vol 751 ◽  
pp. 79-83 ◽  
Author(s):  
Anurag Hamilton ◽  
Ashok Sharma ◽  
Upender Pandel

In the present investigation, WC–10Co–4Cr coating was deposited by high velocity oxy-fuel (HVOF) process on CA6NM hydro turbine steel to improve its erosion resistance. The coating was characterized in term of crossectional microstructure, phase, microhardness and fracture toughness using a field emission scanning electron microscope (FESEM), X-ray diffractometer and microhardness tester respectively. Solid particle erosion resistance of the substrate and coating were evaluated by air jet erosion tester at two different impingement angles (30° and 90°). Coating microstructure has shown a homogeneous and well-bonded laminar morphology. The microhardness of the coating was observed more than three times higher than CA6NM substrate. This resulted in significant improvement in erosion resistance of coated CA6NM steel at both impingement angles.


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