柱状多結晶氷の破壊じん性値に及ぼす試験温度の影響

概要

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The effects of test temperature on fracture toughness K_C and on the fracture surface of columnar grained ice specimens were investigated at -5, -10, -30℃ and -50℃. Sharply edge-notched specimens with section sizes of 25×50mm and 200×50mm were used. Three-point bending tests were conducted under the wide range of loaing rate K^^._I covering from 0.8 up to 3500 kPa√<m>/s. The pop-in crack propagation was also investigated at -10℃ using 25×50mm specimens under K^^._I≒0.8 kPa√<m>/s. The K_C value and its scatter obtained under K^^._I≧30 KPa√<m>/s were substantially unaffected by test temperature and K^^._I. In K^^._I<30 kPa√<m>/s, the effect of test temperature on the K_C value was observed. The macroscopic fracture surface was affected by test temperature and K^^._I. Two types of pop-in cracks which extended along the grain boundary or the plane of cleavage were observed.
一般社団法人日本機械学会の論文
1991-02-25