Abstract
nitial crack widely exits in the welded crane members. These cracks are induced by defect of design and manufacturing and effect of alternate fatigue stress. The fatigue performance and remaining life of welded components which have initial crack is significantly reduced. In the paper the typical box-type welded components of crane are discussed. Based on fatigue propagation experiment of box-type specimen with initially prefabricated crack, the fatigue propagation feature of Q235 steel is studied. Meanwhile finite element software Ansys is used to calculate the stress intensity factor. Combining experimental data and calculated result of stress intensity factor, two important propagation parameters of Q235 steel are acquired. The experiment result can be applied to evaluate the remaining fatigue life of welded crane members with initial crack.
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