A critical evaluation of theories for predicting microcracking in composite laminates

Autor:	Shoufeng Hu, John A. Nairn, Jong Seok Bark
Rok vydání:	1993
Předmět:	Materials science Mechanical Engineering Epoxy Composite laminates Stress (mechanics) Cracking Flexural strength Mechanics of Materials Free surface visual_art Solid mechanics Ultimate tensile strength visual_art.visual_art_medium General Materials Science Composite material
Zdroj:	Journal of Materials Science. 28:5099-5111
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00361186
Popis:	We present experimental results on 21 different layups of Hercules AS4 carbon fiber/3501-6 epoxy laminates. All laminates had 90 deg plies; some had them in the middle, while some had them on a free surface. During tensile loading, the first form of damage in all laminates was microcracking of the 90 deg plies. For each laminate, we recorded both the crack density and the complete distribution of crack spacings as a function of the applied load. By rearranging various microcracking theories, we developed a master-curve approach that permitted plotting the results from all laminates on a single plot. By comparing master-curve plots for different theories, it was possible to critically evaluate the quality of those theories. We found that a critical-energy-release-rate criterion calculated using a 2D variational stress analysis gave the best results. All microcracking theories based on a strength-failure criteria gave poor results. All microcracking theories using 1D stress analyses, regardless of the failure criterion, also gave poor results.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f5f4d30ebbd8a893b60832860ad8eb33 https://doi.org/10.1007/bf00361186 Zobrazit plný text záznamu Full text from SpringerLink