Advanced materials in automotive engineering by Jason Rowe

By Jason Rowe

The car is less than consistent strain to layout automobiles in a position to assembly more and more difficult demanding situations equivalent to better gas financial system, superior defense and powerful emission regulate. starting with a finished advent to complicated fabrics for automobile lightweighting and automobile purposes, complicated fabrics in car engineering is going directly to ponder nanostructured metal for car physique buildings, aluminium sheet and excessive strain die-cast aluminium alloys for car purposes, magnesium alloys for light-weight powertrains and automobile our bodies, and polymer and composite moulding applied sciences. the ultimate chapters then think about a number of layout and production concerns that have to be addressed whilst operating with complicated fabrics, together with the layout of complex automobile physique constructions and closures, applied sciences for decreasing noise, vibration and harshness, becoming a member of platforms, and the recycling of car fabrics.

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The plastic strain at fracture is reduced at increased strain rates. 001 s–1) than during forming operations (typically between 1 s–1 and 10 s–1). These considerations are mostly of importance for forming of steels as aluminium alloys are not affected that much by strain rate sensitivity at the strain rates usually experienced during forming operations. 1 Introduction Depending on the material used (iron, magnesium, aluminium, carbon steel or stainless steel) several forming techniques are available to the automotive engineer to produce parts, such as casting, extrusion, forging and cutting.

To fill in the missing points various criteria have been developed, such as Tresca and Von Mises. Each of these criteria will give a different shape of curve. Tresca assumes a straightforward linear relation between measured points. Von Mises assumes an elliptical shape, predicting higher yield stresses (see Fig. 5). , in finite element simulations) these models have been found to be inaccurate. 5 Yield locus according to Tresca and Von Mises. to better estimate the shape of the curve. The Vegter-criterion, for instance, is based on the measurement of the uniaxial, plane strain, shear and equibiaxial points.

Materials with high values of n show good formability. They can work harden sufficiently in critical areas to better distribute the strains over other areas thus reducing local build up of strains. 7 Logarithmic representation of true stress-strain curve with n the work hardening exponent. , the major and minor stresses where local necking occurs. Although cracks are the ultimate limit in forming operations, local necking is usually considered undesirable. FLDs can be generated by mapping the failure criteria on a graph of two axes representing major and minor strains.

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