A pressure-sensitive film was used to characterize the asperity contacts along a polymethyl methacrylate (PMMA) interface in the laboratory. The film has structural health monitoring (SHM) applications for flanges and other precision fittings and train rail condition monitoring. To calibrate the film, simple spherical indentation tests were performed and validated against a finite element model...

Single asperity friction experiments using atomic force microscopy (AFM) have been conducted on chemical vapor deposited (CVD) graphene grown on polycrystalline copper foils. Graphene substantially lowers the friction force experienced by the sliding asperity of a silicon AFM tip compared to the surrounding oxidized copper surface by a factor ranging from 1.5 to 7 over loads from the adhesive m...

Surface fatigue wear widely exists, and it occurs as long a sufficient number of loading–unloading cycles are applied. Slowing down surface requires understanding the evolution damage in surface. Real surfaces composed many asperities; therefore, is important to study single asperity. A finite element model an asperity subjected cyclic elastic–plastic normal loading was developed under friction...

the doruneh fault is one of the longest and most prominent faults in iran. however, only two recorded historical earthquakes with magnitudes more than 7 might be related to this fault. for getting more information on this fault more investigation in different fields are required. fault displacement is one of the most important parameters needed to explore the fault activity. in this study, with...

This paper proposes an improved thermal asperity (TA) detection and correction technique for perpendicular recording channels, which performs better than the conventional one. The TA detection method is a threshold-based approach, while the TA correction method is performed by averaging the readback signal and applying a curve-fitting technique to estimate the TA signal. Then, the corrected rea...

(paper pages 133-156) zagros active fold-thrust belt lies on the northern margin of the arabian continental crust it is a young fold-thrust mountain belt currently shortening, thickening and uplifting as a result of the collision of the arabian and iranian plates. rethickening of crust during collisional orogenies could have been carried out by reversal of fault motion along the mesozoic normal...

the nnw-trending dena fault, with 140 km length, cuts the major structures of zagros fold-thrust belt in borujen region. the fault has divided the region in two zones, in which different structural, andmorphological features as well assedimentation and seismtectonic characteristics have developed. this study presents a new interpretation for the kinematics of dena fault based on field evidence....

In this paper, a generalized self-consistent scheme, or “three phase model”, is used to set up a micro-mechanics model for rough surface contact with randomly distributed asperities. The dimensionless average real pressure p is obtained as function of the ratio of the real contact area to the apparent contact area, 0 / A Ar . Both elastic and plastic materials are considered, and the influence ...

Abstract When an electric current flow across interface between two contacting solids a change in the potential occur over interface. One part of contact resistance is due to constrictions at asperity regions. Barber has shown that constriction can be related interfacial stiffness. I discuss relation classical (approximate) Holm theory for and (exact) involving Graphical