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The dissimilar welding of titanium to steel enables the integration of the advantageous properties of both metals, facilitating the design of lightweight, corrosion-resistant, and high-strength multifunctional composite structures. However, significant differences in their thermophysical properties pose substantial technical challenges in practical welding scenarios, necessitating careful selection of process parameters to enhance the quality and performance of the weld joint. This article establishes a support vector machine (SVM) model with laser power, welding speed, and laser spot diameter as independent variables, and the maximum residual stress and minimum yield strength of the weld joint as dependent variables. To improve prediction accuracy, the SVM model is optimized using the beluga whale optimization (BWO) algorithm. Taking the established model as the objective function, the multi-objective salp swarm algorithm (MSSA) is employed to optimize the laser welding process
Zhu, YubinMeng, XiangliZhang, Xinran
Super Duplex Stainless Steels (SDSS) are attracting attentions of the manufacturing industries due to the excellent corrosion resistance to critical corrosion. But SDSS2507 is the hardest to machine with lowest machinability index among DSS family. Moreover, formation of built-up layer (BUL) and work hardening tendency makes it further difficult to machine. Researchers have the conflict in opinions on using wet machining or dry machining using tool coatings. In this investigation SDSS2507 machining is carried out using uncoated and PVD–TiAlSiN-coated tools. The wet and dry machining environment are compared for increase in cutting speed from 170 m/min to 230 m/min. Excellent properties of PVD–TiAlSiN coatings exhibited microhardness of 39 GPa and adhesion strength of 88 N, which outperformed the uncoated tools. Tool life exhibited by coated tools was four times higher than uncoated tools. Wet machining was found to be ineffective when PVD-coated tools are used, exhibiting the same
Sonawane, Gaurav DinkarBachhav, Radhey
Modeling the thermal behavior of dry sliding contacts is complex due to nonlinear thermal boundary conditions and intricate surface interactions. This study reviews and analyzes various thermal models applicable to dry sliding contacts, employing finite element analysis-based numerical simulations for model validation and deeper insights into the system’s physics. The primary goal is to assess the average contact temperatures in sliding pairs of copper-graphite, bronze-graphite, and graphite-graphite. A thermal model is developed, incorporating experimentally measured temperatures taken 2 mm from the contact point and considering the experimental setup’s boundary conditions. The temperature distribution in both the pin and the disc under different loads shows maximum temperatures at the contact point, decreasing with distance both laterally and in depth, reaching a minimum at the outer edges. Results show that the highest temperatures are observed at the contact points, with
Mouadji, YoucefYounes, RassimKhima, SalimBradai, Mohand AmokraneBouchoucha, AliHadidi, Haitham
Recent developments in manufacturing techniques and the development of Al7075 metal matrix composites (MMCs) with reinforcements derived from industrial waste have been steadily gaining popularity for aerospace and automobile applications due to their outstanding properties. However, there are still a lot of limitations with these composite materials. A great deal of research has been done to create new Al7075 MMC materials with the use of economic fly ash (FA) that possesses superior mechanical properties, corrosion resistance, density, and cycle cost. This review outlines different synthesis techniques used in the development of Al7075 MMCs using stir casting. Effects of FA along with other reinforcements on the mechanical, wear, machining, and microstructural properties of the composite are also discussed. Finally, a summary of the application of FA-based MMCs and a recap of the previous discoveries and challenges are reported. Future scope and potential areas of application are
Kumar, RandhirMondal, Sharifuddin
This specification covers a corrosion-resistant, premium aircraft-quality alloy steel in the form of bars, forgings, and stock for forging
AMS F Corrosion and Heat Resistant Alloys Committee
This specification covers a titanium alloy in the form of sheet and strip up to 0.143 inch (3.63 mm), inclusive, in nominal thickness (see 8.6
AMS G Titanium and Refractory Metals Committee
This SAE Standard for reliability-centered maintenance (RCM) is intended for use by any organization that has or makes use of physical assets or systems that it wishes to manage responsibly
G-11M, Maintainability, Supportability and Logistics
This test code describes tests for determining characteristics of hydraulic positive displacement pumps used on off-road self-propelled work machines as referenced in SAE J1116
CTTC C1, Hydraulic Systems
This specification covers an aluminum alloy in the form of die forgings up to 4 inches (102 mm), inclusive, in thickness and hand forgings up to 6 inches (152 mm), inclusive, in thickness (see 8.6
AMS D Nonferrous Alloys Committee
This test code describes tests for determining characteristics of hydraulic positive displacement motors as used on off-road self-propelled work machines as referenced in SAE J1116
CTTC C1, Hydraulic Systems
This specification covers a titanium alloy in the form of round bar and wire 0.625 inch (15.88 mm) and under in nominal diameter or thickness (see 8.7
AMS G Titanium and Refractory Metals Committee
This SAE Standard defines the method for deriving and verifying the peening intensity exerted onto a part surface during shot peening or other surface enhancement processes
Surface Enhancement Committee
To determine the ability of a fuel/water separator to separate emulsified or finely dispersed water from fuels. This test method is applicable for biodiesel fuel
Filter Test Methods Standards Committee
This specification establishes requirements for titanium forgings of any shape or form from which finished parts are to be made (see 2.4.4, 8.3, and 8.6
AMS G Titanium and Refractory Metals Committee
This specification covers a tantalum alloy in the form of bars and rods up through 3.5 inches (88.9 mm), inclusive (see 8.5
AMS G Titanium and Refractory Metals Committee
This test method provides a standardized procedure for evaluating the electrochemical resistance of automotive coolant hose and materials. Electrochemical degradation has been determined to be a major cause of EPDM coolant system hose failures. The test method consists of a procedure which induces voltage to a test specimen while it is exposed to a water/coolant solution. Method #1, referred to as a “Brabolyzer” test, is a whole hose test. Method #2, referred to as a “U” tube test, uses cured plate samples or plates prepared from tube material removed from hose (Method No. 2 is intended as a screening test only). Any test parameters other than those specified in this SAE Recommended Practice, are to be agreed to by the tester and the requester
Non-Hydraulic Hose Committee
This specification covers a silicone (MQ/VMQ/PVMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be designated for use in molded O-rings and molded O-ring cord, molded rings, compression seals, molded-in-place gaskets, and plate seals for aeronautical and aerospace applications
AMS CE Elastomers Committee