Experimental study of post-buckled single-stringer composite specimens under fatigue loads with different load levels and load ratios

A Numerical Assessment of the Influence of Local Stress Ratio in the Fatigue Analysis of Post-Buckled Composite Single-Stringer Specimen

“…The numerical results in terms of load vs. applied displacement are shown in Figure 9, compared with the results of the experimental quasi-static test [24]. displacement are shown in Figure 9, compared with the results of the experimental quasistatic test [24]. The numerical results in Figure 9 are in good agreement with the experimental data in terms of initial stiffness, buckling load and skin-stringer separation opening load and displacement.…”

“…The test campaign included two specimens subjected to quasi-static compressive loads with a loading rate of 0.1 mm/min. The numerical results in terms of load vs. applied displacement are shown in Figure 9, compared with the results of the experimental quasi-static test [24]. displacement are shown in Figure 9, compared with the results of the experimental quasistatic test [24].…”

“…In this paper, a numerical study on fatigue delamination growth in a Single-Stringer Compression (SSC) specimen subjected to post-buckling fatigue load is performed using the "Min-Max Load Approach". Compared to previous research activities, in this paper, the developed numerical methodology is validated with results obtained from an extensive in-house experimental testing campaign, which provided access to unique data not available in the literature [24]. Few works of research can be found in the literature where the buckling and post-buckling behavior of composite stiffened structures under fatigue compressive loads is experimentally investigated for different type of stringer [25,26].…”

“…Several experimental test campaigns were conducted on SSC specimens with a focus on examining the damage tolerance and fatigue life of specimens with initial delamination or indentation damage [28,29]. However, the experimental studies in the literature focus solely on a particular combination of load level and loading ratio, whereas various combinations of these parameters are analyzed in [24].…”

A review on buckling of the laminated composite panel under in-plane load

“…The experimental analysis was carried out on two stiffened panels with three stringers under compression load to find the buckling load and post-buckling behavior of the panels for determination of failure pattern and failure location, and also numerical analysis was done to predict the bucking shape of the stiffened panel [48]. By using digital image correlation and an ultrasonic system to measure displacements, strains, and the extension of the delamination length, researchers were able to experimentally monitor the damage tolerance of stiffened composite with an initial delamination in skin-stringer debonding under quasi-static and fatigue loads [49].…”