caa a22 4500 469124075 CHVBK 20180323133146.0 cr unu---uuuuu 170328e19920201xx s 000 0 eng 10.1007/BF00034183 doi (NATIONALLICENCE)springer-10.1007/BF00034183 Toribio J. Department of Materials Science, Polytechnical University of Madrid, E.T.S.I., Caminos, Ciudad Universitaria, 28040, Madrid, Spain aut Stress intensity factor solutions for a cracked bolt loaded by a nut [Elektronische Daten] [J. Toribio] This paper presents the calculation of stress intensity factor (K) solutions for surface cracks in the thread ground of bolts subjected to axial loading directly applied by the nut. The stress-strain computations have been done by means of the finite element method with quarter-point singular isoparametric elements along the crack front. The stress intensity factor is calculated through the stiffness derivative method, by using a virtual crack extension technique to compute the energy release rate. Two modifications are made to improve the accuracy of the results: the displacement not only of the main node, but also of the quarter-point nodes located in the normal plane and the adjacent nodes in the crack line, avoiding both the change of the singularity and the crack curving. The results show that direct loading on the thread flank by a nut increases the stress intensity factor. This effect decreases with the crack length. For the deepest circular cracks, however, nut loading relaxes the K-value, mainly at the crack surface. Kluwer Academic Publishers, 1992 International Journal of Fracture Kluwer Academic Publishers 53/4(1992-02-01), 367-385 0376-9429 53:4<367 1992 53 10704 https://doi.org/10.1007/BF00034183 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00034183 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Toribio J. Department of Materials Science, Polytechnical University of Madrid, E.T.S.I., Caminos, Ciudad Universitaria, 28040, Madrid, Spain aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 53/4(1992-02-01), 367-385 0376-9429 53:4<367 1992 53 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer