Sökning: "Jens Bergström"
Visar resultat 6 - 10 av 24 avhandlingar innehållade orden Jens Bergström.
6. Wear mechanisms in sheet metal forming : Effects of tool microstructure, adhesion and temperature
Sammanfattning : The general trend in the car body manufacturing industry is towards low-series production and reduction of press lubricants and car weight. The limited use of lubricants, in combination with the introduction of high and ultrahigh-strength sheet materials, continuously increases the demands on the forming tools. LÄS MER
7. On the deformation behavior and cracking of ductile iron; effect of microstructure
Sammanfattning : This thesis focuses on the effect of microstructural variation on the mechanical properties and deformation behavior of ductile iron. To research and determine these effects, two grades of ductile iron, (i) GJS-500-7 and (ii) high silicon GJS-500-14, were cast in a geometry containing several plates with different section thicknesses in order to produce microstructural variation. LÄS MER
8. Very high cycle fatigue of tool steels
Sammanfattning : An increasing number of engineering components are expected to have fatigue life in the range of 107 - 1010 load cycles. Some examples of such components are found in airplanes, automobiles and high speed trains. LÄS MER
9. Lära för framtiden : Transfer i teknisk yrkesutbildning
Sammanfattning : Den här avhandlingen handlar om transfer i relation till tekniklärande och teknisk yrkesutbildning. Transfer är centralt för all utbildning och att kunna använda och bygga vidare på tidigare kunskaper och erfarenheter i nya situationer är nödvändigt i ett föränderligt samhälle med en snabb teknisk utveckling. LÄS MER
10. Residual Stresses and Fatigue of Shot Peened Cast Iron
Sammanfattning : The complex geometry of cylinder head in heavy-duty diesel engine makes grey cast iron or compact graphite iron a perfect material choice due to its castability, thermal conductivity and damping capacity. To increase the efficiency of the engine, the fatigue property of the material needs to be improved. LÄS MER