| Description |
xv, 166 leaves : illustrations ; 29 cm |
| Summary |
"In recent years fuel economy has become one of the major criteria for the the design of automobiles. In order to improve the efficiency of their vehicles many automotive designers are substituting high strength sheet steels for traditional materials of lower strength. This thesis discusses experimental work which was done to determine the representative mechanical properties and stress-strain relationships of a select group of high strength sheet steels with nominal yield strengths ranging from 80 to 140 ksi. The results show that high strength sheet steels are quite anisotropic with the variation in measured properties depending on the type of sheet steel, the direction of testing and the type of testing. The literature was reviewed in depth to determine the effects of strain rate and fatigue on the design of automotive components using high strength sheet steels. It was found that increasing strain rates generally increased the strength of these steels while decreasing their ductility. The literature review of fatigue analysis revealed that even the most accurate fatigue analysis methods currently available to the automotive engineer predict fatigue lives that differ substantially from the actual lives obtained from tests "--Abstract, leaf ii. |
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