延性不安定破壊条件に関する検討

概要

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In this paper, it is experimentally proved that the onset of tearing instability is evaluated simply through the equilibrium of stiffeness between the external structure and the crack member ; that is, the slope of the load versus the load line displacement (P-V_g) curve. A procedure to estimate the instability from the P-V_g characteritics of compact tension specimens with a wide range of crack length to width ratios loded in series with a spring is proposed, and it agreed well with the experiments for two materials. An approximate procedure to apply the concept to actual structures without using a fracture mechanics parameter such as J or T is discussed. An example of the practical application is shown, in determining expressions for the instability conditions of a circumferential or axial crack in a cylindrical vessel or pipe.
一般社団法人日本機械学会の論文
1988-01-25