本文分析了薄焊接试板弯曲试样失效的原因，并对减少失效的可能性作出了阐述。
The paper discusses the reasons why the welded test sample loses its efficiency and suggests how to reduce possibilities of such failure.
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.
在各弯曲试样得到不同的预应变后，又对其进行反向加载，记录不同预应变下各试样反向加载的弯矩随表面应变的变化曲线。
In these experiments, specimens were bending to produce different pre-strain respectively, and then reverse bending were taken one by one.
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