Carbon-fiber-reinforced epoxy composite (CEC) has gained widespread acceptance as a structural material in various applications. Drilled holes are essential for assembling components. Reducing drilling-induced damage and temperature effects is crucial improved surface quality integrity of the drilled composite. In present work, drilling experiments were conducted on CEC, hexagonal-boron nitride...

This study compares the film thickness, lubricant temperature, and traction curves of two groups commonly used constitutive models for lubricants in thermo-elastohydrodynamic lubrication (TEHL) modelling. The first group consists Tait equation state, Doolittle Newtonian viscosity model, Carreau shear thinning model. second includes Dowson Roelands–Houpert Eyring simulations were conducted using...

The use of petro-lubricants in metal forming leads to lamination oxide on the extrudates due temperature increase and reaction base with some elements lubricant, hence resulting poor surface quality end product. non-biodegradability these lubricants also environmental pollution. Although De-oiled Jatropha Caked has been volarised for so many applications, oil left cake it can still be employed ...

Recent studies have shown the existence of two types of discontinuous lipid structures in the synovial fluid lubricant film: (i) the lipid multilayers which form the synovial fluidcartilage interface [Purbach, Clin.Orthop.Relat.Res.2002], and (ii) lipid vesicles present within lubricant films [Watanabe, Med.Electron.Microsc.2000]. The size of these lipid vesicles, compared to the thickness of t...

BACKGROUND Apart from penile-anal intercourse, other anal sexual practices (rimming, fingering and saliva use as a lubricant for anal sex) are common among men who have sex with men (MSM). The aim of this study is to evaluate whether these anal sexual practices are risk factors for rectal gonorrhoea in MSM. METHOD A cross-sectional survey was conducted among MSM attending Melbourne Sexual Hea...

objective: microbial plaque is among the main etiologies of periodontal disease, and tooth brushing with toothpaste is the most commonly used method of plaque control. this study aimed to compare the efficacy of tooth brushing with and without three different dentifrices.   methods: thirty dental students were randomly selected to participate in this clinical trial and were asked to refrain fro...

bstract Solid lubricating coatings comprise a large segment of tribological materials and under a spherical contact the coating/substrate interface xperiences cyclic shear stress that leads to delamination of the coatings from the substrate and premature failure. The polymeric solid lubricating oating used in this study is an expanded PTFE/epoxy composite. The coatings experience cumulative dam...

Quantum chemical investigations of the action of hindered phenol radical stabilizers in lubricant degradation chemistry have been completed. We are currently developing the first mechanistic models of lubricant degradation with the aim of including the chemistry of additives such as radical stabilizers that are found in commercial lubricant formulations. A key component of development of these ...