How can calculate fracture load of three-point bending testing through strength and ductility data obtained from tensile testing?
and in three-point bending testing ,how to calculate stress distribution of crosssection beyond elasticity scope?
According to the current thinking you cannot do this, at least not universally, i.e. across all materials. Although there should be a link between tensile properties and fracture toughness, for the moment the toughness is considered a separate material property that needs to be measured, e.g. by 3PB specimen. Hence you need to measure the fracture load of such a specimen, not infer it from tensile test stress-strain curve.
Dear Andrey,
Tough I agree with you but a lot of experts may not agree with your comment. See the following discussion
https://www.researchgate.net/post/What_is_the_difference_between_toughness_and_ductility_of_a_material
Dear Hou,
for the second part of your question, see the attachment. Use the appropriate model which fits your material/condition the best.
Hello, Hao!
This problem can be solved by finite element method. You should create a detailed 3D model of your specimen and set material properties obtained from tensile test in a form of stress-strain curve (multilinear hardening). The criterion of fracture load can be reaching of critical stress in the tip of the notch or critical SIF, but in this case you need a certain meshing of model in near notch region.
Usually such tasks are solving using software like ANSYS or ABACUS.
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