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| FRACTURE TOUGHNESS TEST BY IMPACT-FATIGUE METHOD |
| Yang Zheng (North-West Engineering Institute) |
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Cite this article:
Yang Zheng (North-West Engineering Institute). FRACTURE TOUGHNESS TEST BY IMPACT-FATIGUE METHOD. Acta Metall Sin, 1978, 14(4): 409-468.
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Abstract The crack tip stress intensity factor under impact-fatigue conditions expressed by the equation K_I=(AE/BW)~(1/2)·F(a/W) may be used as a measure of fracture toughness of materials on condition that a proper calibration of K_I with the compliance measurements is made. The fracture toughness values obtained by the above method are equivalent to the dynamic fracture toughness K_(Id) with loading rate of the order (?)=10~5kg/mm~(3/2)/sec, and would be valid as the critical crack length of the fracture surface of specimens are constrained within the range of a/W=0.36-0.6.The above method is simple and convenient for testing fracture toughness of materials. The testing results may be obtained directly from a ready made curve provided that the critical crack length on fracture surface has been predetermined. It can be recommended as a screen method in practical work.
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Received: 18 April 1978
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[1] 陈篪,力学,1974,№ 4,121．
[2] 北京钢铁研究院断裂韧性研究组,金属学报,13(1977) ,214．
[3] Turner, C.E., Impact Testing of Metals, Amer. Soc. Test. Mater., Spec. Tech. Publ. № 466, (1970) , p. 93．\ |
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