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Variability of structural aluminium alloys mechanical properties
Graphical abstract
HighlightsA databank of results is analysed to provide reliable indicators of variability.Distributions of strength variables are a foundation for a reliability analysis.Evaluation of nominal values reveals unsafe and overly conservative values.Material partial factors discover if the desired level of reliability is achieved.Nominal values based on a uniform level of safety are proposed.
AbstractContent of alloying elements, type of treatment, welding and testing parameters result in variability of mechanical properties of aluminium alloys, which needs to be taken into account in design procedures. The degree of variability and current nominal values safety level were evaluated using a collection of results from published sources, expanded with experimental work. Processed results of proof and tensile strengths were fitted to distributions and cumulative function relevant fractiles for design purposes determined. It was established that ratios of characteristic to nominal values vary from 1.23 to 0.75, being unsafe or having a built in excess margin of safety, so new nominal values were proposed. These new values provide a more economical material partial factor value and a uniform reliability level.
Variability of structural aluminium alloys mechanical properties
Graphical abstract
HighlightsA databank of results is analysed to provide reliable indicators of variability.Distributions of strength variables are a foundation for a reliability analysis.Evaluation of nominal values reveals unsafe and overly conservative values.Material partial factors discover if the desired level of reliability is achieved.Nominal values based on a uniform level of safety are proposed.
AbstractContent of alloying elements, type of treatment, welding and testing parameters result in variability of mechanical properties of aluminium alloys, which needs to be taken into account in design procedures. The degree of variability and current nominal values safety level were evaluated using a collection of results from published sources, expanded with experimental work. Processed results of proof and tensile strengths were fitted to distributions and cumulative function relevant fractiles for design purposes determined. It was established that ratios of characteristic to nominal values vary from 1.23 to 0.75, being unsafe or having a built in excess margin of safety, so new nominal values were proposed. These new values provide a more economical material partial factor value and a uniform reliability level.
Variability of structural aluminium alloys mechanical properties
Dokšanović, Tihomir (author) / Džeba, Ivica (author) / Markulak, Damir (author)
Structural Safety ; 67 ; 11-26
2017-03-23
16 pages
Article (Journal)
Electronic Resource
English
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