Computational model of spalling and effective fibers on toughening in fiber reinforced composites at an early stage of crack formation

• Autor(a) principal: Wang,Chong
• Data de Publicação: 2013
• Outros Autores: Friedrich,Leandro Ferreira
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Latin American journal of solids and structures (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252013000400008
• topic: Fiber reinforced composite; toughening; spalling; bridging stress; fiber/matrix interface; Kelvin fundamental solution

This work suggests a computational model that takes account of effective fibers on toughening in FRC at an early stage of crack formation. We derived the distribution of pressure provoked by a random inclined fiber in the matrix and calculated stresses through integrating the pressure and tangent stress along the fiber/matrix interface with the Kelvin's fundamental solution and the Mindlin's complementary solution. The evolution of spalling in the matrix was traced. The percentages of effective fibers were evaluated with variations in strength, interface resistance, diameter and elasticity modulus. The main conclusion is that low elasticity modulus combined high strength of fibers raises dramatically the effective fibers, which would benefit toughening.