Phosphoric iron of two different phosphorus content, namely P 1 (Fe-0.30P-0.226C), P 2 (Fe-0.11P-.028C) were first prepared by ingot casting route. The ingot were soaked and forged at 1150 o C. The microstructures of the phosphoric iron and its relevant mechanical properties such as hardness and tensile properties have been characterized. J-R curves of the material have been determined at room temperature. Fracture behaviour under tearing load has been studied through fracture toughness tests

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... phosphoric iron using Compact Tension (CT) specimens of Width (W) =50 mm and thickness (B) =12.5mm. J-R curves were obtained from specimens precracked to a/W = 0.5 .The single specimen unloading compliance method have been used for generating J-R curves. 1088 A. K. Vishnoi, B.K. Mishra, S. Prakash Vol.9, No.12 2.4.4 Generation of J-R curve: Calculation of J: The magnitude of J is the sum of its elastic and plastic component denoted by J el and J pl . The elastic component of J was calculated using the equation J = J el + J pl J el = K i 2 (1-ν 2 ) / E + J pl where K i the elastic stress intensity parameter is evaluated using the expression given below [15] 1092