TY - JOUR
T1 - A state-space model of fatigue crack growth
AU - Patankar, Ravindra
AU - Ray, Asok
AU - Lakhtakia, Akhlesh
N1 - Funding Information:
∗ The research work reported in this paper is supported in part by the National Science Foundation under Research Grants No. DMI-9424587 and CMS-9531835 and NASA Langley Research Center under Grant No. NCC-1-249. ∗∗ Author for correspondence; e-mail: [email protected].
PY - 1998
Y1 - 1998
N2 - This paper proposes a nonlinear dynamic model of fatigue crack growth in the state-space setting based on the crack closure concept under cyclic stress excitation of variable amplitude and random loading. The model state variables are the crack length and the crack opening stress. The state-space model is capable of capturing the effects of stress overload and underload on crack retardation and acceleration, and the model predictions are in fair agreement with experimental data on the 7075-T6 aluminum alloy. Furthermore, the state-space model recursively computes the crack opening stress via a simple functional relationship and does not require a stacked array of peaks and valleys of stress history for its execution; therefore, savings in both computation time and memory requirement are significant. As such, the state space model is suitable for real-time damage monitoring and control in operating machinery.
AB - This paper proposes a nonlinear dynamic model of fatigue crack growth in the state-space setting based on the crack closure concept under cyclic stress excitation of variable amplitude and random loading. The model state variables are the crack length and the crack opening stress. The state-space model is capable of capturing the effects of stress overload and underload on crack retardation and acceleration, and the model predictions are in fair agreement with experimental data on the 7075-T6 aluminum alloy. Furthermore, the state-space model recursively computes the crack opening stress via a simple functional relationship and does not require a stacked array of peaks and valleys of stress history for its execution; therefore, savings in both computation time and memory requirement are significant. As such, the state space model is suitable for real-time damage monitoring and control in operating machinery.
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U2 - 10.1023/A:1007491916925
DO - 10.1023/A:1007491916925
M3 - Article
AN - SCOPUS:0032269327
SN - 0376-9429
VL - 90
SP - 235
EP - 249
JO - International Journal of Fracture
JF - International Journal of Fracture
IS - 3
ER -