HE Han,BAI Xiaoning,CAO Yang. Research on the prediction method of Ⅰ+Ⅱ mixed-mode crack growth rate in 6005A-T6 aluminum alloy based on limited samples[J]. Journal of Mechanical Strength,2025,47(10):131-138.
HE Han,BAI Xiaoning,CAO Yang. Research on the prediction method of Ⅰ+Ⅱ mixed-mode crack growth rate in 6005A-T6 aluminum alloy based on limited samples[J]. Journal of Mechanical Strength,2025,47(10):131-138. DOI: DOI:10.16579/j.issn.1001.9669.2025.10.015.
Research on the prediction method of Ⅰ+Ⅱ mixed-mode crack growth rate in 6005A-T6 aluminum alloy based on limited samples
To evaluate the performance of various equivalent stress intensity factor models in predicting mixed-mode fatigue crack growth and to address the challenge of parameter estimation under limited sample conditions. A crack growth parameter estimation method based on the Bootstrap method resampling technique was proposed firstly. Mode Ⅰ fatigue crack growth tests were conducted on CT specimens to obtain the material parameters
and the proposed method was employed to expand the sample set and mitigate the issue of data scarcity. Then
using the statistically augmented material parameters
mixed-mode Ⅰ+Ⅱ fatigue crack growth experiments were performed on 6005A-T6 aluminum alloy CTS specimens under loading angles of 0°
30°
45° and 60°
employing a Richard-type loading fixture
to validate the accuracy of various equivalent stress intensity
factor models. The results indicate that the Irwin model achieved the highest goodness-of-fit
with a value of 0.942 1
demonstrating the best crack growth prediction performance. Increasing the loading angle was found to reduce the initial crack growth rate
highlighting the need for angle-specific experiments to obtain appropriate Paris law parameters. This study confirms the applicability of multiple Δ
K
eq
models and provides theoretical support for fatigue life prediction in mixed-mode crack growth scenarios.
GAO Shuling , LI Ning , YUE Yanan , et al . Fatigue-damage early detection and residual life estimation of welded joints based on diffuse ultrasound field [J]. China Civil Engineering Journal , 2024 , 57 ( 9 ): 22 - 33 . (In Chinese)
HAN L , HE X F , NING Y , et al . An aircraft structural risk assessment method considering fatigue crack propagation based on fatigue damage diagnosis and prognosis [J]. International Journal of Fatigue , 2025 , 190 : 108650 .
ZHANG Z , YANG B , WANG Y D , et al . A hybrid distribution characteristics of equivalent structural stress method for fatigue evaluation of welded structures [J]. International Journal of Fatigue , 2024 , 179 : 108057 .
LIU Pengshuai , WANG Xiaowei , HOU Jun . Combined high and low cycle fatigue life prediction model taking account of coupled damage [J]. Journal of Mechanical Strength , 2024 , 46 ( 5 ): 1175 - 1183 . (In Chinese)
LESIUK G , SMOLNICKI M , MECH R , et al . Analysis of fatigue crack growth under mixed mode (I+II) loading conditions in rail steel using CTS specimen [J]. Engineering Failure Analysis , 2020 , 109 : 104354 .
SOUSA A D C , NUSSBAUMER A . Multiaxial ultra low cycle fatigue in welded high strength steel structural components [J]. Journal of Constructional Steel Research , 2019 , 153 : 473 - 482 .
MIAO Xinting , LIU Guoxu , ZHANG Jinbo , et al . Study on constraint of mixed mode crack and failure assessment diagram of pressure-bearing structure [J]. Journal of Mechanical Strength , 2025 , 47 ( 1 ): 113 - 122 . (In Chinese)
WANG Lianqing , KE Jin , WANG Hongying . Investigation on mixed modeⅠ-Ⅱfatigue crack of 7050 aluminum alloy [J]. China Measurement & Test , 2021 , 47 ( 1 ): 139 - 146 . (In Chinese)
DU Xuelin , YU Haikun , SHEN Deji , et al . Multi-axial fatigue performance and crack expansion behavior of 2198-T8 aluminum-lithium alloy [J]. Journal of Plasticity Engineering , 2024 , 31 ( 7 ): 223 - 231 . (In Chinese)
CHEOK E W W , CHEN C , QIAN X D , et al . A general maximum energy release rate criterion for mixed mode I/II fatigue crack growth under large-scale yielding [J]. Theoretical and Applied Fracture Mechanics , 2025 , 138 : 104899 .
QIAO K Q , LIU Z J , GUO Q Y , et al . Mixed-mode (I+II) fatigue crack growth of marine steels in Arctic environments [J]. Ocean Engineering , 2024 , 310 : 118686 .
RICHARD H A , BUCHHOLZ F G , KULLMER G , et al . 2D and 3D-mixed mode fracture criteria [J]. Key Engineering Materials , 2003 , 251/252 : 251 - 260 .
DEMIR O , AYHAN A O , SEDAT İ . A new specimen for mixed mode-I/II fracture tests:modeling,experiments and criteria development [J]. Engineering Fracture Mechanics , 2017 , 178 : 457 - 476 .
CAO Shusen , HE Xiaofan , YANG Boxiao , et al . Solution of stress intensity factor of surface cracked geometry with clamped ends [J]. Journal of Beijing University of Aeronautics and Astronautics , 2014 , 40 ( 11 ): 1637 - 1642 . (In Chinese)
ZHANG Z , WANG Y D , YU C Y , et al . Simulation and verification of master S - N curves of titanium alloy welded structures based on bootstrap method [J]. Advances in Mechanical Engineering , 2022 , 14 ( 7 ): 16878132221107441 .
SAJITH S , SHUKLA S S , MURTHY K S R K , et al . Mixed mode fatigue crack growth studies in AISI 316 stainless steel [J]. European Journal of Mechanics - A/Solids , 2020 , 80 : 103898 .