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Characterization of post-peak stress degradation of 3K70PW carbon fabric/INF114 for MAT 213 material model
Yerram, Ganesh Netha
Yerram, Ganesh Netha
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t24064_Yerram.pdf
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2024-12
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Modeling post-peak stress degradation or the softening behavior of 3K70PW Carbon Fabric/INF114 carbon fiber reinforced polymer (CFRP) is presented. Post-peak response delineates material response beyond its ultimate limit, represented by a softening curve. For characterizing this response, Over-height Compact Tension (OCT) and Over-height Compact Compression (OCC) specimens were mechanically tested in this study for stable measurement of post-peak stress degradation with digital image correlation (DIC) using GOM ARAMIS system for full-field displacement and strain mapping during the crack/crush growth. The tests were conducted under cyclic loading where unloading occurred after crack/crush growth, to capture a stable response. Non-destructive tests were conducted on tested specimens to determine the height of the damage process zone or characteristic height, which assisted in differentiating the strains within and outside the damage process zone. Post-peak stress degradation guided by strain-softening response was constructed for OCT test using the area and compliance calibration method, while for OCC tests, the equilibrium of forces and moments alongside the strains obtained just outside the damage process zone was used to construct the exponential softening response according to Keshavanarayana, S., Yerram, G., and Jagadheeswaran, S (2024) [48]. Finite element analysis was used to simulate and validate the behavior of OCT and OCC specimens by implementing the strain-softening curves scaled for different element sizes in LS-DYNA’s MAT 213 constitutive material model. The simulation results obtained were comparable to the experimental results, thus providing evidence for the experiments to be a promising tool for characterizing and validating the post-peak stress degradation response of a laminate during an impact event simulation using MAT 213 material model.
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Thesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Aerospace Engineering
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Wichita State University
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