Research on the influence of prefabricated crack width for the stress intensity factor of variable size disc specimens
ZHANG Sheng
WANG Longfei
Abstract：In order to get the influence of prefabricated crack width on the dimensionless stress intensity of disc specimen with different sizes.ABAQUS software was used for,numerical analysis of cracked straight-through flattened Brazilian disc (CSTFBD).In the model,the sizes of disc diameter were 40mm,80mm,100mm,120mm and 200mm and the width of prefabricated crack ranged from 0mm to 2.0mm.The dimensionless stress intensity factors were calibrated by the equivalent zone integration method when the ratio of crack length to disc diameter was 0.55.Results show that the dimensionless stress intensity increase along with the increase of the crack width.The maximum relative error is 13.53％ when the disc specimens have same diameter sizes.If the size of disc diameter increase,the influence will be decreased,however the maximum relative error is still more than 3％.A revised formula of the dimensionless stress intensity factor was given to eliminate the influence of the prefabricated crack width.It provides a theoretical basis for determining the fracture toughness value by using cracked straight-through flattened Brazilian disc specimen.
Keywords：prefabricated crack widthdimensionless stress intensity factorequivalent area integral methodcracked straight-through flattened Brazilian disc (CSTFBD)
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 116-123 )