Historical Version s - view previous versions of standard. More D A K Ic value is believed to represent a lower limiting value of fracture toughness. This value has been used to estimate the relation between failure stress and defect size for a material in service wherein the conditions of high constraint described above would be expected.
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ASTM D characterizes the toughness of plastics in terms of the critical-stress-intensity factor, KIc, and the energy per unit area of crack surface or critical strain energy release rate, GIc, at fracture initiation. The property KIc GIc determined by ASTM D characterizes the resistance of a material to fracture in a neutral environment in the presence of a sharp crack under severe tensile constraint, such that the state of stress near the crack front approaches plane strain, and the crack-tip plastic or non-linear viscoelastic region is small compared with the crack size and specimen dimensions in the constraint direction.
A KIc value is believed to represent a lower limiting value of fracture toughness. This value may be used to estimate the relation between failure stress and defect size for a material in service wherein the conditions of high constraint described above would be expected.
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ASTM D5045 Fracture Toughness and Strain Energy Release Rate of Plastic Materials