Direct assessment of tensile stress-crack opening behavior of Strain Hardening Cementitious Composites (SHCC)

• Autor(a) principal: Pereira, E. N. B.
• Data de Publicação: 2012
• Outros Autores: Fischer, G., Barros, Joaquim A. O.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/21536
• topic: Fiber reinforcement; Tensile properties; Finite element analysis; Crack detection; Material design; Crack detection material design; Crack detection material design (B); Fiber reinforcement (E); Finite element analysis (C); Tensile properties (C); Science & Technology

The process of designing Strain Hardening Cementitious Composites (SHCC) is driven by the need to achieve certain performance parameters in tension. These are typically the pseudo-strain hardening behavior and the ability to develop multiple cracks. The assessment of the tensile load-deformation of these materials is therefore of great importance and is frequently carried out by characterizing the material tensile stress-strain behavior. In this paper an alternative approach to evaluate the tensile performance of SHCC is investigated. The behavior of the material in tension is studied at the level of a single crack and the tensile performance is evaluated in terms of the tensile stress-crack opening behavior. The experimental procedure and test setup used are discussed. The derived tensile stress-crack opening behavior is utilized to analyze and compare the influence of various composite parameters on the resulting tensile behavior. The deformations occurring during tensile loading are furthermore examined using a digital image analysis technique to gain detailed insight into the crack formation, propagation and opening phases.