TY - JOUR
T1 - Experimental Study on Variable-Amplitude Fatigue of Welded Cross Plate-Hollow Sphere Joints in Grid Structures
AU - Jiao, Jin Feng
AU - Lei, Hong Gang
AU - Chen, Y. Frank
N1 - Publisher Copyright:
© 2018 Jin-Feng Jiao et al.
PY - 2018
Y1 - 2018
N2 - The fatigue stress amplitude of the welded cross plate-hollow sphere joint (WCPHSJ) in a grid structure varies due to the random loading produced by suspending cranes. A total of 14 specimens considering three different types of WCPHSJs were prepared and tested using a specially designed test rig. Four typical loading conditions, "low-high,""high-low,""low-high-low,"and "high-low-high,"were first considered in the tests to investigate the fatigue behavior under variable load amplitudes, followed by metallographic analyses. The experimental and metallographic analysis results provide a fundamental understanding on the fatigue fracture form and fatigue mechanism of WCPHSJs. Based on the available data from constant-amplitude fatigue tests, the variable-amplitude fatigue life of the three types of WCPHSJs was estimated using the Miner rule and Corten-Dolan theory. Since both accumulative damage theories yield virtually same damaging results, the Miner rule is hence suggested to estimate the fatigue life of WCPHSJs.
AB - The fatigue stress amplitude of the welded cross plate-hollow sphere joint (WCPHSJ) in a grid structure varies due to the random loading produced by suspending cranes. A total of 14 specimens considering three different types of WCPHSJs were prepared and tested using a specially designed test rig. Four typical loading conditions, "low-high,""high-low,""low-high-low,"and "high-low-high,"were first considered in the tests to investigate the fatigue behavior under variable load amplitudes, followed by metallographic analyses. The experimental and metallographic analysis results provide a fundamental understanding on the fatigue fracture form and fatigue mechanism of WCPHSJs. Based on the available data from constant-amplitude fatigue tests, the variable-amplitude fatigue life of the three types of WCPHSJs was estimated using the Miner rule and Corten-Dolan theory. Since both accumulative damage theories yield virtually same damaging results, the Miner rule is hence suggested to estimate the fatigue life of WCPHSJs.
UR - http://www.scopus.com/inward/record.url?scp=85166009912&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85166009912&partnerID=8YFLogxK
U2 - 10.1155/2018/8431584
DO - 10.1155/2018/8431584
M3 - Article
AN - SCOPUS:85166009912
SN - 1687-8434
VL - 2018
JO - Advances in Materials Science and Engineering
JF - Advances in Materials Science and Engineering
M1 - 8431584
ER -