Browsing by Author "Politis, Denis J."
Now showing items 1-13 of 13
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An analysis of the tooth stress distribution of forged bi-metallic gears
Politis, Denis J.; Politis, Nicholas J; Lin, Jianguo; Dean, Trevor A; Balint, Daniel S (2018)The work described in this paper is an evaluation of the contact characteristics of bi-metallic gears forged through a novel bi-metallic gear forging process. Finite element analysis of the contact characteristics of single ...
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Article
Coating effects on the galling behaviour of aluminium metal forming processes
Yang, Xiao; Hu, Yiran; Zheng, Yang; Politis, Denis J.; Wang, Liliang (2019)This paper investigates the effect of coatings on the galling behaviour in metal forming processes. To investigate this phenomenon, pin-on-disc tests were conducted on the Anton Paar THT tribometer with discs manufactured ...
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Coupled thermal-electrical finite element analysis of electrical resistance heating in hot stamping of ultra-high strength steel tubes
Loh-Mousavi, Mohsen; AhmadiRad, Mehdi; Maeno, Tomoyoshi; Politis, Denis J.; Wang, LiLiang (2018)A hot metal gas stamping process of an ultra-high strength steel tube has been investigated using a coupled thermal-electrical finite element analysis. In this process, a quenchable air filled steel tube was quickly heated ...
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Development of a computational optimisation system to determine constitutive equation constants for metal alloys
Politis, Nicholas J; Politis, Denis J. (2019)Simulations of metal forming processes typically use constitutive equations to describe material properties over a wide range of temperatures and strain rates. Classically, determining a set of values for the large number ...
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Development of an interactive friction model to predict aluminum transfer in a pin-on-disc sliding system
Hu, Y.; Zheng, Y.; Politis, Denis J.; Masen, M. A.; Cui, J.; Wang, L. (2019)In aluminum forming processes, it is observed that the coefficient of friction increases and a transfer layer is formed on the tool surfaces. In the current paper, this phenomenon is studied via pin-on-disc dry sliding ...
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Development of the post-form strength prediction model for a high-strength 6xxx aluminium alloy with pre-existing precipitates and residual dislocations
Zhang, Qunli; Luan, Xi; Dhawan, Saksham; Politis, Denis J.; Du, Qiang; Fu, Ming Wang; Wang, Kehuan; Gharbi, Mohammad M.; Wang, Liliang (2019)The applications of lightweight and high strength sheet aluminium alloys are increasing rapidly in the automotive industry due to the expanding global demand in this industrial cluster. Accurate prediction of the post-form ...
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Effect of porosities on tensile properties of laser-welded Al-Li alloy: an experimental and modelling study
He, Enguang; Liu, Jun; Lee, Junyi; Wang, Kehuan; Politis, Denis J.; Chen, Li; Wang, Liliang (2018)Aluminium–lithium (Al-Li) alloys are very attractive for aerospace applications due to their outstanding properties, such as high specific strength, high rigidity and good resistance to corrosion and fatigue, compared to ...
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Formability and microstructure evolution mechanisms of Ti6Al4V alloy during a novel hot stamping process
Kopec, Mateusz; Wang, Kehuan; Politis, Denis J.; Wang, Yaoqi; Wang, Liliang; Lin, Jianguo (2018)A novel hot stamping process for Ti6Al4V alloy using cold forming tools and a hot blank was presented in this paper. The formability of the material was studied through uniaxial tensile tests at temperatures ranging from ...
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The Galling Behavior of Advanced Coating Contacts with Aluminium Alloy during Sliding Wear
Hu, Yi Ran; Gharbi, Mohammad M.; Liang, Vivian; Zheng, Yang; Politis, Denis J.; Wang, Li Liang (2018)This paper investigates the galling behaviour of a range of hard coatings applied to tooling surfaces during the sheet forming of an aluminium alloy workpiece. A total of three types of tooling materials were investigated, ...
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Investigating the quench sensitivity of high strength AA6082 aluminium alloy during the new FAST forming process
Zhang, Qunli; Luan, Xi; Dhawan, Saksham; Politis, Denis J.; Cai, Zhaoheng; Wang, Liliang (2018)Optimised manufacturing rates offer enormous cost saving benefits to industry. FAST (Fast light Alloys Stamping Technology) has been recently developed to rapidly and economically manufacture high-strength panel components ...
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A review of force reduction methods in precision forging axisymmetric shapes
Politis, Denis J.; Politis, Nicholas J.; Lin, Jianguo; Dean, Trevor A. (2018)This paper provides a review of the methods developed over the years for reducing working forces for the precision metal forming processes. Precision forging normally involves completely, or near completely closed cavity ...
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A review on forming techniques for manufacturing lightweight complex—shaped aluminium panel components
Zheng, Kailun; Politis, Denis J.; Wang, Liliang; Lin, Jianguo (2018)Aluminium alloys are being increasingly utilised in the automotive and aerospace industries to reduce the weight of vehicles. Extensive research has been conducted to overcome the poor ductility of aluminium alloys at room ...
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Springback characteristics of a martensitic steel for warm U-shape bending: Experiments and FE simulation
Sun, Y.; Cai, Z.; Politis, Denis J.; Luan, X.; Chen, G.; Wang, L. (2019)Martensitic (MS) steel, a modern type of Ultra-high Strength Steel (UHSS), offers a significantly improved strength-to-weight ratio compared to conventional cold rolled steel grades. This is especially important for weight ...