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# Orthotropic material

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 maartenbrink (Mechanical) 16 Dec 10 6:51
 Can anyone clarify the conventional equivalent to the suggested form of orthotropic properties in NX5.0 Nastran?This question is asked before by potrero (http://www.eng-tips.com/viewthread.cfm?qid=223824&page=128), who suggested the following interpretation;Poissons_Ratio_X     =    XYPoissons_Ratio_Y     =    YZPoissons_Ratio_Z     =    ZXShear_Modulus_X      =    XYShear_Modulus_Y      =    YZShear_Modulus_Z      =    ZXHowever, on the following URL another interpretation is given; http://iberisa.com/soporte/femap/composites/nafems_benchmark_composite_test_r0031_3.htmPoissons_Ratio_X     =    XYPoissons_Ratio_Y     =    XZPoissons_Ratio_Z     =    YZShear_Modulus_X      =    XYShear_Modulus_Y      =    XZShear_Modulus_Z      =    YZWhich is correct?Regards

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