TY - JOUR
T1 - Fatigue analysis of a post-buckled composite single-stringer specimen taking into account the local stress ratio
AU - Raimondo, A.
AU - Bisagni, C.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - The fatigue life prediction of post-buckled composite structures represents still an unresolved issue due to the complexity of the phenomenon and the high costs of experimental testing. In this paper, a novel numerical approach, called “Min-Max Load Approach”, is used to analyze the behavior of a composite single-stringer specimen with an initial skin-stringer delamination subjected to post-buckling fatigue compressive load. The proposed approach, based on cohesive zone model technique, is able to evaluate the local stress ratio during the delamination growth, performing, in a single Finite Element analysis, the simulation of the structure at the maximum and minimum load of the fatigue cycle. The knowledge of the actual value of the local stress ratio is crucial to correctly calculate the crack growth rate. At first, the specimen is analyzed under quasi-static loading conditions, then the fatigue simulation is performed. The results of the numerical analysis are compared with the data of an experimental campaign previously conducted, showing the capabilities of the proposed approach.
AB - The fatigue life prediction of post-buckled composite structures represents still an unresolved issue due to the complexity of the phenomenon and the high costs of experimental testing. In this paper, a novel numerical approach, called “Min-Max Load Approach”, is used to analyze the behavior of a composite single-stringer specimen with an initial skin-stringer delamination subjected to post-buckling fatigue compressive load. The proposed approach, based on cohesive zone model technique, is able to evaluate the local stress ratio during the delamination growth, performing, in a single Finite Element analysis, the simulation of the structure at the maximum and minimum load of the fatigue cycle. The knowledge of the actual value of the local stress ratio is crucial to correctly calculate the crack growth rate. At first, the specimen is analyzed under quasi-static loading conditions, then the fatigue simulation is performed. The results of the numerical analysis are compared with the data of an experimental campaign previously conducted, showing the capabilities of the proposed approach.
KW - Composite structures
KW - Delamination
KW - Fatigue
KW - Local stress ratio
KW - Post-buckling
KW - Skin-stringer separation
UR - http://www.scopus.com/inward/record.url?scp=85082769999&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2020.108000
DO - 10.1016/j.compositesb.2020.108000
M3 - Article
AN - SCOPUS:85082769999
SN - 1359-8368
VL - 193
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 108000
ER -