In ASTM D7250/7250M and ASTM C393/C393M mentions using short support span length , this statement is not specific by any simple rule , does any one has an idea how get value of short support span , where Iam using sandwich length 20 cm and 15 cm
Flexural Stress for Beams Tested at Large Support
Spans (s f)—
If support span-to-depth ratios greater than 16 to
1 are used such that deflections in excess of 10 % of the
support span occur, the stress in the outer surface of the
specimen for a simple beam can be reasonably approximated
with the following equation
stress=(3PL/2bd^2) [1+6 (D/L)^2-4(d/L)(D/L)]
if your case is short beam (span-to-depth) less than 16 to 1
you can use the nominal equation drived in strength of materials books
stress= 3PL/2bd^2
P=load
L=support span
b= width of tested beam
d=depth of tested beam
D = deflection of the centerline of the specimen at the
middle of the support span,
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