Diamond-like carbon is one of the most studied and used solid lubricants on the market.Despite this large use and its outstanding mechanical and tribological properties,there are still some unclear aspects related to its self-lubricant properties,and some drawbacks in the deposition methods.We deposited soft DLC films on Si(100),iron,and stainless steel substrates by PVD magnetron A Chemical,Mechanical,and Tribological Analysis of DLC properties of DLC and AISI 304 steel,compared to pure iron ones.This res ult was in agreement with the higher adhesion of soft-DLC films on ha rd substrates found by Owens et al..COHESIVE AND ADHESIVE STRENGTH OF DLC ON DIFFERENT STEEL Instrumented scratch testing is carried out to assess the failure modes of two DLC coatings on different steel substrates.Scratch tip on the DLC sample.Figures - uploaded by Duanjie Li
Problem Brass rivets were cracking during assembly,when the rivets were being set.Failure analysis of the rivets was performed as part of the process to determine the root cause of the cracking.The rivets were manufactured by machining them from wire stock.The main requirements for the rivet material were Easy to machine rivet Design and Evaluation of a New Resin-Filled GFRP Pipe Figure 2.Failure modes of FRP bars spliced with the proposed connection system.In these failure modes,the desired one is FRP bar rupture which means the connec-tion system performs well in transfer the tensile force and the high strength of FRP bars can fully be utilized.Whereas the rest two prem ature failures (i.e.,GFRP pipe rupture andEvaluation of DLC coatings for spark-ignited,direct DLC coatings for automotive applications w4 x.They noted that the roughness and hardness of the substrate are important parameters in tailoring a coating-substrate system for performance.A paper by Erdemir et al.described the wear resistance of Argonnes DLC coating in diesel fuels with a variety of sulfur levels,including
Diamond-like carbon (DLC) films are extensively used in various industries due to their superior protective and lubrication properties.However,DLC films including sp2 and sp3 carbon bonding are metastable materials,which can be thermally degraded (or graphitized) at elevated temperature.In this study,a novel Raman spectroscopy technique was developed to evaluate the in-situ thermal Evaluation of failure properties of a DLC/steel system using combined nanoindentation and finite element approach Failing Culverts The Geotechnical Perspectiveand soil composite system.These impact factors change the structural properties of the pipe and/or the surrounding supporting soil that make the composite system stable.Deterioration of the properties of these structural elements leads to mechanical failure such as seam separation,buckling failure of the invert or crown as pipe material or
According to these results,the mechanical properties of the DLC coating remain almost stable up to a temperature of 350 °C.However,the coating fatigue endurance to repetitive impact loads progressively worsens up to around 150 deg;C due to its increasing deformation imposed byFatigue and adhesion characterization of DLC coatings on The mechanical properties of the DLC coating and its steel substrate were determined via nano-indentations and a FEM supported evaluation of the obtained results.The coating fatigue and adhesion were quantified by perpendicular and inclined impact tests respectively,coupled with appropriate finite element method (FEM) calculations.Fatigue and adhesion characterization of DLC coatings on The mechanical properties of the DLC coating and its steel substrate were determined via nano-indentations and a FEM supported evaluation of the obtained results.The coating fatigue and adhesion were quantified by perpendicular and inclined impact tests respectively,coupled with appropriate finite element method (FEM) calculations.
Fatigue life is a key concern in welded-steel frames for mobile equipment that experience large and varying dynamic loads.For engineers who design welded-steel structures subject to dynamic GEAR MATERIALS,PROPERTIES,AND MANUFACTUREFailure analysis,fatigue life prediction,and mechanical testing are examined in Chapters 13,14,and 15,respectively.In Chapter 13,Gear Failure Modes and Analysis, emphasis has been placed on two of the most common types of gear failurebending fatigue and contact fatigue.BendingGuidance for Performing Failure Mode and EffectsOverview Failure Mode and Effects Analysis (FMEA) is a structured way to identify and address potential problems,or failures and their resulting effects on the system or process before an adverse event occurs.In comparison,root cause analysis (RCA) is a structured way to address problems after they occur.FMEA
The DLC (Diamond-Like Carbon) coatings were not only having a low friction coefficient but also good wear and corrosion resistance.In this work,both the corrosion behavior and the adhesion of the DLC hard coating,deposited on nitrided and non-nitrided AISI 420 stainless steel substrates,were studied.How To Evaluate Materials - Properties To Consider MetalTekNov 23,2020·Mechanical properties are how the metal performs when different forces are applied to them.That includes things like strength,ductility,wear resistance,etc.The mechanical and physical properties of materials are determined by their chemical composition and their internal structure,like grain size or crystal structure.Introduction.Diamond-like carbon (DLC) coating is a functional coating material that possesses excellent mechanicalExperimental details.The carburizing and quenching,as well as low temperature tempering technologies are used asEvaluation of Adhesion and Wear Resistance of DLC Films The factor due to plastic deformation has been considered to be dominant for DLC coatings characterized by such properties as high hardness and thinness.However,the results of this study showed that the cyclic factor is a more important failure mode that fits the
Evaluation of the tribological properties of DLC for engine applications S D A Lawes,M E Fitzpatrick and S V The Diamond Like Carbon coatings (DLC) are gaining prime importance in the field PLATIT 80 coating system was used to deposit DLC coatings upon the above described substrates.Some results are removed in response to a notice of local law requirement.For more information,please see here.Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextEvaluation of Flow and Failure Properties of Treatedbased on calculating the critical failure strain,shown in Eq.8 .f ¼½D1 þD2e D3Q 1 þ D4ln _p 4130 steel is listed below in Table_0 ½1 þ D5T ð8Þ where f is the equivalent strain at failure,D1-D5 are all experimentally determined coefcients,and Q is the tri-axiality factor.The formulation of the failure strain Eq.8 is similar
Mar 19,2017·The steel structures can be used soon after their erection; No sudden failure Steel being a ductile material does not have sudden failure,rather it gives clear indication by deflection before failure.Formwork unneeded Unlike concrete structures,the steel structure does notStructural Failure Evaluation of a Substandard RC Building Aug 04,2020·Structural Failure Evaluation of a Substandard RC Building due to Basement Story Short-Column Damage both buildings have the same structural system and material properties.To let in daylight,ribbon windows were constructed on the partial infill walls adjacent to some of the columns at the basement story level,which resulted in the short The Effect of Hydrogen on Fatigue Properties of Metals The effect of hydrogen on the fatigue properties of alloys which are used in fuel cell (FC) systems has been investigated.In a typical FC system,various alloys are used in hydrogen environments and are subjected to cyclic loading due to pressurization,mechanical vibrations,etc.The materials investigated were three austenitic stainless steels (SUS304,SUS316 and SUS316L),one ferritic
DLC/steel a-C a-C:H Si-DLC Yes - - Pro-wear process must involve the presence of the steel counterface DLC/DLC No - - Sugimoto  DLC/steel a-C:H - - Yes Graphitization of the DLC followed by the formation of hard Mo compounds on the steel counterpace accelerating the wear on the DLC plate.2 Experimental details 2.1 Pin-on-plate testsThe study of adhesion and nanomechanical properties of DLC The main purpose of this study is to research the tribological properties and mechanical properties of diamond-like carbon coating (DLC) used unbalanced magnetron sputtering system (UBMS).Tribochemistry of Boundary Lubricated DLC/SteelA better understanding of DLC wear may lead to lubricant additive solutions being tailored for DLC surfaces to provide excellent durability (wear) as well as similar or increased fuel economy (low friction).In this work,the wear and friction properties of DLC coating under boundary lubrication conditions have been investigated.
The tribological tests were performed using steel/steel,steel/DLC and DLC/DLC contacts,and found that the coefficient of friction was 0.062,0.059 and 0.048,and the wear loss was 5.57 × 10 UDC 629 .11 .023 539 .43 62 - 752 Evaluation of ples of evaluation of such properties.2.Evaluation of Fatigue Properties of Members 2.1 Background Many of the members of a car body that must be mass produced are made of pieces of steel sheet joined together by,for example,spot or arc welding.These welds are subject to stress concentrationsWear Mechanisms of Hydrogenated DLC in Oils Containing Aug 26,2016·Diamond-Like Carbon (DLC) coatings are well known for offering excellent tribological properties.They have been shown to offer low friction and outstanding wear performance in both dry and lubricated conditions.Application of these coatings for automotive components is considered as a promising strategy to cope with the emerging requirements regarding fuel economy and durability.