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ARTICLE
Study on the stress intensity factor of a compact specimen under the pre-compressed load condition
1
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin, China
2
Aviation Engineering Institute, Civil Aviation University of China, Tianjin, China
3
The 18th Research Institute of China Electronics Technology Group Corporation, Tianjin, China
Submission date: 2022-10-05
Acceptance date: 2022-10-10
Online publication date: 2023-01-03
Publication date: 2023-01-30
Corresponding author
Dongquan Wu
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, China
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, China
Journal of Theoretical and Applied Mechanics 2023;61(1):37-47
KEYWORDS
TOPICS
ABSTRACT
Structural components are often operated under combined stress conditions (primary and
secondary stresses), but the stress levels generated by residual stress (or secondary stress) is
hardly ever evaluated. Hence, stress intensity factors at the crack tips of a compact tension
(CT) specimen under a pre-compressed load condition are analyzed using the finite element
method. Then, the average residual stress intensity factor is calculated and analyzed. As
the crack length α0/W increases, the average residual stresses σave/σ0 grows under the
same pre-compression load. σave/σ0 increases rapidly at a low range of the pre-compression
load but tends to a constant in a high range of the load. The distribution of the average
residual stress intensity factors Kave and Κave/σ0 of the CT specimen with same crack length
under different pre-compression loads have the same tendency. Additionally, the distribution
of Κave and KFEM under different pre-compression loads are also similar. Nevertheless,
Kave estimated by the average residual stress is too conservative and not accurate, and
the method is complex, which depends on the analysis of simulation. Therefore, a simple
method for calculating Mode I stress intensity factor K for this model is presented. A group
of examples is presented to verify the accuracy of the method.
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