{"id":38224,"date":"2019-10-09T19:24:35","date_gmt":"2019-10-09T19:24:35","guid":{"rendered":"\/forum\/forums\/topic\/shear-stresses-in-the-homogenized-core-of-sandwich-panel\/"},"modified":"2019-10-09T19:24:35","modified_gmt":"2019-10-09T19:24:35","slug":"shear-stresses-in-the-homogenized-core-of-sandwich-panel","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/shear-stresses-in-the-homogenized-core-of-sandwich-panel\/","title":{"rendered":"shear stresses in the homogenized core of sandwich panel"},"content":{"rendered":"

I am trying to simulate the 3 point bending test of sandwich composite. For this i replaced the honeycomb core geometry by solid core after giving the same orthotropic properties to the solid core.(homogenized)<\/p>\n

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The bending stress in the face sheet and the central deflection of the sandwich matches the analytical result.<\/p>\n

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 The value of shear stress in the honeycomb core by analytical method is 0.369 Mpa. While the shear stress in the solid core is about 0.471 Mpa.<\/p>\n

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My questions are:<\/p>\n

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1. This method holds good for the deflection and bending stress in the face sheet but can i expect the similar accuracy in the stresses in solid core.<\/p>\n

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2.The below research paper suggests the relation between the shear stresses in the solid core geometry to the honeycomb geometry. But when i put the values to check it , the difference between the analytical and FEA values increases by a great margin.<\/p>\n

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LITERATURE <\/strong><\/p>\n

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ANALYTICAL METHOD TO FIND OUT SHEAR STRESS IN HONEYCOMB CORE:-<\/em><\/p>\n

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shear stress in xz plane = P\/(D+C)xB<\/p>\n

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Where P is the load = 400  <\/p>\n

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C is core height = 12.7 mm<\/p>\n

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Dis sandwich height=13.1 mm<\/p>\n

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b is sandwich width=42 mm<\/p>\n

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so value comes out to be = 0.369 MPa<\/em><\/p>\n

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ANSYS:-<\/strong><\/p>\n

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Shear stress in the xz plane is 0.471 Mpa\"\" <\/p>\n

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LITERATURE 2<\/strong><\/p>\n

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Another research paper established a relationship between the shear stresses in the actual honeycomb core and homogenized solid core.\"\"<\/p>\n

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\"\"<\/p>\n

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b = 5.499mm , t =0.2 mm <\/p>\n

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so as per the first relation <\/p>\n

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shear stress in the honeycomb core = (b\/t)x shear stress in XZ plane of solid core.<\/p>\n

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b\/t = 27.496<\/p>\n

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But<\/p>\n

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shear stress in honeycomb core =0.369Mpa<\/p>\n

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shear stress in homoginesed core ( by ansys) =0.471 Mpa<\/p>\n

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so the above relation is not satisfied.<\/p>\n

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here is the research paper.<\/p>\n","protected":false},"template":"","class_list":["post-38224","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t