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A platform for research: civil engineering, architecture and urbanism
Wrinkling analysis of flat faced sandwich panels with respect to bonding strength and core properties with mineral wool as core material
In this work the wrinkling behaviour of flat faced sandwich panels with a core of mineral wool is studied. The study is done using a geometrical and material non-linear finite element method. The calculated results are compared to available experimental data. The behaviour and specific properties of mineral wool when used as a core material is studied in detail. Specifically the influence of strength properties, in particular in connection to initial imperfections in the form of out-of-flatness, is studied. In order to study the influence of bonding strength separated from the core strength a bar model is used. From this part of the study the following conclusions are drawn: 1. In the compression stress-strain curve for mineral wool there is normally a sway in the beginning of the curve. This has a reducing effect on the wrinkling strength. 2. Of the material parameters the core properties have a greater influence on the wrinkling strength than the yield strength of the face material. 3. The out-of-flatness has a minor role as a separate parameter. Only in combination with high or medium stiffness properties and low bonding strength it has a dominant role for the wrinkling strength. 4. The bonding strength itself has a dominant role for the wrinkling strength especially in the region below 50 kPa and up to 50% of the wrinkling strength might be lost when the bonding strength is reduced from 80 kPa to 20 kPa. 5. The proposed reduction formula for low bonding strength gives an estimate of the strength that is supported by the results in this study and gives good agreement for panels with medium or high core stiffness and strength values. For panels with low core stiffness values this reduction is on safe side.
Wrinkling analysis of flat faced sandwich panels with respect to bonding strength and core properties with mineral wool as core material
In this work the wrinkling behaviour of flat faced sandwich panels with a core of mineral wool is studied. The study is done using a geometrical and material non-linear finite element method. The calculated results are compared to available experimental data. The behaviour and specific properties of mineral wool when used as a core material is studied in detail. Specifically the influence of strength properties, in particular in connection to initial imperfections in the form of out-of-flatness, is studied. In order to study the influence of bonding strength separated from the core strength a bar model is used. From this part of the study the following conclusions are drawn: 1. In the compression stress-strain curve for mineral wool there is normally a sway in the beginning of the curve. This has a reducing effect on the wrinkling strength. 2. Of the material parameters the core properties have a greater influence on the wrinkling strength than the yield strength of the face material. 3. The out-of-flatness has a minor role as a separate parameter. Only in combination with high or medium stiffness properties and low bonding strength it has a dominant role for the wrinkling strength. 4. The bonding strength itself has a dominant role for the wrinkling strength especially in the region below 50 kPa and up to 50% of the wrinkling strength might be lost when the bonding strength is reduced from 80 kPa to 20 kPa. 5. The proposed reduction formula for low bonding strength gives an estimate of the strength that is supported by the results in this study and gives good agreement for panels with medium or high core stiffness and strength values. For panels with low core stiffness values this reduction is on safe side.
Wrinkling analysis of flat faced sandwich panels with respect to bonding strength and core properties with mineral wool as core material
Knickuntersuchungen von ebenen Sandwichplatten im Zusammenhang mit der Haftfestigkeit und den Kerneigenschaften bei Mineralwollplatten
Heselius, Lars (author)
2005
113 Seiten, Bilder, Tabellen, 24 Quellen
Theses
German
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