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Get Price2018-10-1 · These merge into the ‘Ultra-High Performance Polymers’, with very high melting points, higher strength such as the polyaramids (e.g. Kevlar) and the PAEK family which includes Polyetheretherketone, or ‘PEEK’, with σ B up to 100 MPa, melting point around 343 °C and a usable temperature range to 250 °C, produced by specialist companies, with prices beginning in the region of …
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Get Price2021-5-1 · 2021-5-1 · For instance, controlling of machining-induced integrity is crucial when it comes to ultra-high-strength (UHS) steels for landing gear systems. Early studies on UHS steels investigated their HCF strength after grinding, turning and milling, with best performance exhibited by ground surfaces . However, at that time it was not possible to fully address the nature of the observed performance, as …
Get Price2020-12-1 · 2020-12-1 · Pure electrolytic copper (99.9 %) of 10 mm diameter was utilized as tool electrode in a high accuracy CNC machine tool. Surface roughness was found to rise as gap current and duty factor rises. Surface roughness was achieved in the range of 2.30–3.33 μm by rotating electrode; in contrast, stationary electrode gave surface roughness in the range of 2.50–3.50 μm.
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Get Price2018-3-1 · 2.1. Manufacturing processes for alloys. The AM processes fall into two categories defined by ASTM Standard F2792 as Directed Energy Deposition (DED) and Powder Bed Fusion (PBF). A further distinction is provided as a function of the primary heat source; we will use the nomenclature for laser (L), electron beam (EB), plasma arc (PA), and gas metal arc (GMA) heat sources as PBF-L, PBF-EB, …
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Get Price2018-10-1 · 2018-10-1 · Many different polymers and polymer composites are used for engineering applications in which friction and wear are critical issues. This article briefs (a) the importance of polymer tribology in general, (b) the special design principles of polymer composites for low friction and wear under sliding against smooth metallic counterparts, and (c) synergistic effects of nano-particles and ...
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Get Price2021-5-1 · 2021-5-1 · New concepts are being developed by the research community to understand the influence of micro-mechanical states locally generated by machining (as outlined in Part I of this review []) and address their influence on the fatigue performance of machined parts.A close relationship exists between the machining-induced surface integrity, the behaviour of the machined surface under …
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Get Price2018-3-1 · 2.1. Manufacturing processes for alloys. The AM processes fall into two categories defined by ASTM Standard F2792 as Directed Energy Deposition (DED) and Powder Bed Fusion (PBF). A further distinction is provided as a function of the primary heat source; we will use the nomenclature for laser (L), electron beam (EB), plasma arc (PA), and gas metal arc (GMA) heat sources as PBF-L, PBF-EB, …
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