What is it about?
To analyze the effect of the width of a prefabricated crack on the dimensionless stress intensity factor of notched semi-circular bend (NSCB) specimens, ABAQUS software was employed to perform numerical calibration of the crack tip for the width of prefabricated cracks in the range of 0.0-2.0mm. It provides a theoretical basis for a more accurate fracture toughness value measured using an NSCB specimen.
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Why is it important?
The relative errors of the dimensionless stress intensity factor for different widths of prefabricated cracks were analyzed. The results indicate that the dimensionless stress intensity factor shows an approximate linear increase as the width of the prefabricated crack increases. The longer is the length of the prefabricated crack, the “faster” is the increase in speed. The effect of the dimensionless support spacing on the increase in the speed of the dimensionless stress intensity factor due to the increase in crack width is minimal. When the prefabricated crack width is 2.0 mm, the maximum relative error of the dimensionless stress intensity factor is 4.325%. The new formula for the dimensionless stress intensity factor that eliminates the influence of the width of a prefabricated crack is given.
Perspectives
An artificial prefabricated crack has a certain width, which causes a non-strict correspondence relation between the dimensionless stress intensity factor given by the recommended formula substitution and fracture load obtained by experiments. The obtained fracture toughness exhibits a certain deviation from the true fracture toughness value. Our wok may find a way to reduce the erro by the artificial prefabricated crack with different width.
Sheng Zhang
Henan Polytechnic University
Read the Original
This page is a summary of: Numerical Simulation of the Influence of Width of a Prefabricated Crack on the Dimensionless Stress Intensity Factor of Notched Semi-Circular Bend Specimens, Shock and Vibration, May 2019, Hindawi Publishing Corporation,
DOI: 10.1155/2019/3291730.
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