Failure Analysis of CFRP Multidirectional Laminates Using the Probabilistic Weibull Distribution Model under Static Loading
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The application of carbon fiber reinforced polymer (CFRP) Multidirectional (MD) laminates in aircraft structure have motivated the manufacturers to tailor the mechanical strength in desired directions. The complex stress field owing to multiple orientations with the loading direction increases the intricacy of failure analysis. Hence, the macroscopic and microscopic fracture behaviour of MD CFRP laminates under static loading needs to be explored further. In this study, four different MD CFRP laminates were fabricated using IMA/M21 prepregs by the autoclaving technique. Effect of fiber orientation on static strength i.e. tensile and compressive strength was studied. The strength decreased with the increase in orientation angle. Scanning electron micrographs revealed that irrespective of the lay-up sequence individual layers failed parallel to the fiber direction. Fiber breakage and delamination were the major failure modes in tensile specimens while kinking, matrix failure, in-plane shear, stepped fracture, and fiber-matrix debonding were dominated in compression specimens. The theoretical and experimental data was in good agreement with the Weibull distribution model.
KeywordsCFRP Multidirectional Tensile strength Compressive strength SEM
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The authors express their sincere thanks to Director, VNIT, and Head of Department of Metallurgical & Materials Engineering, VNIT, Nagpur for providing testing facilities, support, and encouragement for this work. The authors gratefully acknowledge Dr. C.M. Manjunatha, Senior Principal Scientist, Structural Technologies Division, CSIR-NAL, Bangalore for his valuable guidance and advice to carry this research.
- 7.M. Daniel and O. Ishai, “Engineering Mechanics of Composite Materials”, 2nd ed., pp.316–329, Oxford University Press, New York, 2006.Google Scholar
- 13.M. S. Hussain, A. R. Anilchandra, N. Jagannathan, and C. M. Manjunatha, Mater. Perform., 5, 132 (2016).Google Scholar
- 29.W. Weibull, J. Appl. Mech., 18, 293 (1951).Google Scholar
- 34.ASTM D3039, “Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials”, ASTM International, West Conshohocken, PA, www.astm.org, 2017.Google Scholar
- 35.ASTM D3410, “Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading”, ASTM International, West Conshohocken, PA, www.astm.org, 2016.Google Scholar
- 42.M. H. Dirikolu, A. Aktas, and B. Birgoren, Turkish J. Eng. Environ. Sci., 26, 45 (2002).Google Scholar