My samples were of different thickness i calculated the span as per ASTM D790. But iam not sure what should be the overhanging on both sides. Does overhanging length have effect on the flexural properties.
You have to ensure only the the thickness to span ratio is maintained, the overhang length must be sufficient so that the sample does no slip in from the rollers. Excess overhang does not affect the test results.
Dear Shanti,
I experienced before, the overhanging parts bend opposite direction when I tested sandwich specimens. As Pramod commented, overhanging parts do not affect to bending properties for ordinal materials, but if it is soft in shear---like sandwiches---, overhangings surely affect. It must be long enough so that the shear deformation at the support point can be negligible. Laminated-composites are normally soft in shear, so you must be careful. FEA may help you to ensure your sample design.
Thank you for your valuable answers pramod vadavkar and Yoshiki Fukuda. One more doubt is whether the loading speed has to be changed with the thickness of the specimen ? What happens if the same speed is maintained for all thicknesses?
Dear Shanti,
I think following Q&A can help you concerning the loading speed.
https://www.researchgate.net/post/Is_Aluminium_sensitive_to_strain_rate
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