A New Fatigue Life Calculation Method Based on Non-Linear Cumulative Damage Theory

Operating characteristics of small and medium tonnage lattice boom crane which withstand fatigue loads was analyzed in this paper. It showed that the lattice boom crane utilization level is in the overlap zone of low cycle fatigue and high cycle fatigue. There may be some plastic deformation in the...

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Bibliographic Details
Published inApplied Mechanics and Materials Vol. 423-426; no. Applied Materials and Technologies for Modern Manufacturing; pp. 2116 - 2122
Main Authors Wang, Xin, Cai, Fu Hai, Zhao, Fu Ling
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 01.09.2013
Subjects
Amplitudes
Boom
Cranes
Fatigue (materials)
Lattices
Mathematical analysis
Nonlinearity
Welded joints
Strain-Life Data
K-Type Welded Joints
Non-Linear Cumulative Damage Theory
Fatigue Life Evaluation
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Summary:Operating characteristics of small and medium tonnage lattice boom crane which withstand fatigue loads was analyzed in this paper. It showed that the lattice boom crane utilization level is in the overlap zone of low cycle fatigue and high cycle fatigue. There may be some plastic deformation in the structure. So the total damage calculated by the Palmgren-Miner rule had a large scatter. Typical operating conditions was analyzed that K-type welded joints of the boom is under axial load and in-plane bending loads. Several critical areas of K-type welded joints were determined by ANSYS finite element calculation software where the stress amplitude was larger on the single side of the lattice boom. A new stress spectrum acquisition method based on the “measured+statistics+compare+simulation” integrated strategy of crane K-type welded joints was proposed. Based on a simplified Huffman non-linear cumulative damage theory, fatigue life of crane K-type welded Joints were calculated based on the strain parameters. They were compared with Palmgren-Miner rule and together with fracture mechanics method. Results showed that although they were all conservative compared with test results, the new method can be applied easily in for engineering applications because it only need amplitude constant amplitude fatigue strain-life data.
Bibliography:Selected, peer reviewed papers from the Third International Conference on Applied Mechanics, Materials and Manufacturing (ICAMMM 2013), August 24-25, 2013, Dalian, China
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISBN:9783037858882
3037858885
ISSN:1660-9336
1662-7482
1662-7482
DOI:10.4028/www.scientific.net/AMM.423-426.2116