Electronical measurement of incision iron specimens’ fracture proceeding and calculation of the structure bearing capacity
WANG Li-Min SUN Ming-Yuan
山东理工大学 交通与车辆工程学院
Cite this article:
WANG Li-Min SUN Ming-Yuan. Electronical measurement of incision iron specimens’ fracture proceeding and calculation of the structure bearing capacity. Acta Metall Sin, 2008, 44(7): 853-858 .
Abstract The crack tip’s break damage process area of the material like cast iron, can be simplified for crack with cohesive force. To investigate the fracture process of iron and the calculation method of the specimens’ maximum bearing capacity, the three-point bending experiment of eight kinds of size incision specimens were tested, and two of the specimens was measured with electrical strain gages equipment. Through the experiment data, a series of curves were obtained and analyzed, such as the curves of displacement of load point with loading on the typical specimens, and the curve of fracture damaged area deformation with the loading, the relationship curve of beam neutral axes position and loading, the curve of position of cohesive crack tip and loading. The Stress Intensity Factor of the different size fracture specimens was calculated. For different size specimens, the computation method of structure bearing capacity was presented through the stress intensity factor’s computation formula and the fracture criterion. The theoretical calculated value was compared with the tested results, and the relative error of them is not big. Then, the method of estimating structures’ maximum bearing capacity is feasible.
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