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落锤试验所确定的NDT温度,是般体结构钢重要的抗断参数。本文就各型试样试验结果不一致所发生的争议进行了研究。研究工作分两步:首先,澄清试验事实。为此采用80mm厚902钢板,进行了系统试验。试验结果再次表明,即使在相同材质条件下,各型试样给出的NDT温度确实超出了试验误差范围。其次,根据几个型号的试样断口,对它们进行了裂纹扩展力的断裂力学标定,并按G=(1/2)(Δ/C)~2·(dc/dA)计算。结果分析表明:各型试样的NDT温度不相同是由于它们的裂纹扩展力不同所致。这就证实了试验结果和计算分析的一致性。 此外,根据NDT温度的分布特征,对T_s>T_(NDT)断裂判据的可靠度计算进行了讨论,给出了可靠度R的计算实例。 本文的试验研究为落锤试验方法相应部分的修订提供了依据。
The NDT temperature determined by the drop hammer test is an important resistance parameter of the structural steel. This article has carried on the research to the controversy that each kind of sample test result is inconsistent. The research work is divided into two steps: First, to clarify the experimental facts. For this purpose, using 80mm thick 902 steel, the system test. Test results again show that, even in the same material conditions, NDT temperature of each type of sample does not exceed the experimental error range. Second, fracture mechanics calibration of crack propagation force was carried out on several types of specimens according to G = (1/2) (Δ / C) ~ 2 · (dc / dA). The results show that: NDT temperature of each type of specimen is not the same due to their different crack propagation force. This confirms the consistency of the test results and the calculation and analysis. In addition, according to the distribution of NDT temperature, the reliability calculation of T_s> T_ (NDT) fracture criterion is discussed, and the calculation example of reliability R is given. The experimental study in this paper provides the basis for the revision of the corresponding parts of the drop-weight test method.