Surface topography in autobody manufacture—the state of the art

Abstract

The continued globalization of the automotive industry, market saturation and escalating legislative requirements are placing demands on European automotive manufacturers. In response, manufacturers and their supply chains are striving to reduce cost and weight and to extend product lifecycle times while enhancing quality to maintain competitiveness with North America and the Far East, to meet legislation and to increase penetration into new markets. In response to this there has been an increasing emphasis on the three-dimensional nature of surfaces and the relationship to pressing performance. This is re¯ected in the fact that the European Union is sponsoring two major projects in the area of three-dimensional surface metrology. The object of this paper is to review the literature published to date in the area of automotive pressing performance and to draw general conclusions, which will set directions for future research.

Using matrix methods to characterise the evolution of deformation induced surface roughness in aluminium sheet

“…As a result, there is a strong demand for analytical techniques that reliably characterise the evolution of plastic deformation induced surfaces in three dimensions. 18 This paper presents a surface characterisation of deformed commercial aluminium sheet using a measurement and sampling protocol that integrates high resolution topographical imaging and rigorous matrix based threedimensional methods. The advantages of this protocol are compared to a traditional roughness profile analysis and are presented from the perspective of improving the reliability of the surface roughness data used in numeric predictions of sheet metal formability.…”

Surface roughness of heat protective clothing textiles

“…For, white noise has dependence of log(PSD) on the log(frequency) nearly horizontal plateau for all frequencies (the ordinates of PSD are independent and exponentially distributed with common variance (Ott et al, 1994)). More complicated rough surfaces as a result of grinding can be modelled by the Markov type processes (Sacerdotti et al, 2000). For these models the dependence of log(PSD) on the log(frequency) has plateau at small frequencies than bent down and are nearly linear at high frequencies.…”