scholarly journals Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

2019 ◽  
Vol 162 ◽  
pp. 515-519 ◽  
Author(s):  
Mostafa Hassani-Gangaraj ◽  
David Veysset ◽  
Victor K. Champagne ◽  
Keith A. Nelson ◽  
Christopher A. Schuh
Keyword(s):  
Cold Spray ◽  
Adiabatic Shear ◽  
Shear Instability ◽  
Adiabatic Shear Instability

scholarly journals Adiabatic shear instability is not necessary for adhesion in cold spray

2018 ◽  
Vol 158 ◽  
pp. 430-439 ◽  
Author(s):  
Mostafa Hassani-Gangaraj ◽  
David Veysset ◽  
Victor K. Champagne ◽  
Keith A. Nelson ◽  
Christopher A. Schuh
Keyword(s):  
Cold Spray ◽  
Adiabatic Shear ◽  
Shear Instability ◽  
Adiabatic Shear Instability

Numerical Simulation of Solid Ti6AI4V Particles Impinging on a Stainless-Steel Substrate at High Speed: Influence of the Particle Temperature

2021 ◽  
Author(s):  
P. Khamsepour ◽  
C. Moreau ◽  
A. Dolatabadi
Keyword(s):  
Stainless Steel ◽  
Cold Spray ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Particle Temperature ◽  
Adiabatic Shear ◽  
Shear Instability ◽  
Main Concern ◽  
Particle Deformation ◽  
Adiabatic Shear Instability

Abstract Additive manufacturing processes have been used to produce or repair components in different industry sectors like aerospace, automotive, and biomedical. In these processes, a part can be built by either melted particles as in selective laser melting (SLM) or solid-state particles as in the cold spray process. The cold spray has gained significant attention due to its potential for high deposition rate and nearly zero oxidation. However, the main concern associated with using the cold spray is the level of porosity in as-fabricated samples, altering their mechanical properties. These pores are primarily found in the regions where adiabatic shear instability does not occur. It is worth noting that the deformation of the impacted solid particle plays a vital role in reaching the shear instability. Therefore, for investigating the adiabatic shear instability region, an elastic-plastic simulation approach has been used. For this purpose, it is assumed that an elevated temperature solid Ti6Al4V particle impacts on a stainless-steel substrate surface at high velocity. The results show that increasing particle temperature will significantly enhance particle deformation because of thermal softening. Additionally, they illustrate that a material jet responsible for producing a bonding between particle and substrate by ejecting the broken oxide layer will be formed when the particle has a temperature above 1073 K and substrate remains at room temperature. In the end, it should be noted that increasing particle temperature up to 723 K will not have a significant effect on substrate deformation and final substrate temperature.

Comment on ‘Adiabatic shear instability is not necessary for adhesion in cold spray’

2019 ◽  
Vol 162 ◽  
pp. 512-514 ◽  
Author(s):  
H. Assadi ◽  
F. Gärtner ◽  
T. Klassen ◽  
H. Kreye
Keyword(s):  
Cold Spray ◽  
Adiabatic Shear ◽  
Shear Instability ◽  
Adiabatic Shear Instability

A scuffing criterion of steels based on the friction-induced adiabatic shear instability

2020 ◽  
Vol 148 ◽  
pp. 106340
Author(s):  
Chuanwei Zhang ◽  
Bo Peng ◽  
Le Gu ◽  
Tingjian Wang ◽  
Liqin Wang
Keyword(s):  
Adiabatic Shear ◽  
Shear Instability ◽  
Adiabatic Shear Instability

Analytical Modeling to Predict Adiabatic Shear Critical Condition for Orthogonal Cutting

2012 ◽  
Vol 723 ◽  
pp. 41-49
Author(s):  
Qi Biao Yang ◽  
Zhan Qiang Liu ◽  
Zhen Yu Shi
Keyword(s):  
Strain Rate ◽  
Shear Strain ◽  
Critical Condition ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Adiabatic Shear ◽  
Shear Instability ◽  
Shear Strain Rate ◽  
Hardening Coefficient ◽  
Adiabatic Shear Instability

As the deformation of chip increases with cutting speed, the morphology of chip changes from continuous to serrated type. It is supposed that serrated chips generate due to adiabatic shear instability in the primary deformation zone. A new analytical model for predicting adiabatic shear critical condition in orthogonal cutting is proposed by considering cutting conditions and properties of workpiece material. It is found that the influence of shear strain on the onset of adiabatic shear could be neglected. The shear strain rate and temperature, however, play a leading role on the onset of adiabatic shear. At lower cutting speed the shear strain rate plays a dominant role while at higher cutting speed the situation is just the reverse. With the increase of cutting speed, the yield stress, material characteristic constant and uncut chip thickness will facilitate adiabatic shear instability, while the coefficient of strain rate hardening, coefficient of strain hardening, coefficient of thermal softening, thermal diffusivity and tool rake angle have negative effect on adiabatic shear instability.

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