ポリカーボネートの計装化シャルピー衝撃特性 : 切欠長さと温度の影響

抄録

The impact bending characteristics of polycarbonate are investigated by means of an instrumented Charpy impact tester. The maximum load per unit area and the specific absorbed energy decrease with increase in the relative notch length. When the relationship between the absorbed energy and BWΦ is plotted as a straight line in an approximate method, the dynamic energy release rate, 𝒢 _ID, can be determined by the slope of the straight line, and the 𝒢 _ID values increase with increase in temperature. The relationship between the dynamic intensity factor, K_ID, which is determined by the dynamic energy release rate, and the temperature shows a tendency similar to the relationship between the maximum load per unit area and the temperature, and has the minimum value at a temperature of 0°C. It is observed that the area ratio of the huckle zone to the fracture surface is larger when the relative notch length is smaller, and ratio of the mist zone to the fracture surface is larger when the relative notch length is larger. It is also found that the crack growth rate is lower on the mist zone and higher on the huckle zone.