本文，对混凝土弯曲试样进行了测试，并用四种不同的方法进行了平面应变断裂韧性的计算和比较。

In this paper, the test results of bending concrete specimens are shown, and the vlues of plane-strain fracture toughness, calculated by four different methods, are compared with one another.

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指出对这样的管材做小试样的J积分试验来测试其断裂韧性既方便、合理，又经济。

And points out simultaneously it is convenient, reasonable and economic for the pipe product to be tested for its fracture toughness of J integration with small samples.

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采用缺口和裂纹两种试样测定合金的断裂韧性；

The fracture toughness of the alloys was measured on single-edge notched beam and cracked beam specimens.

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