首页 | 本学科首页   官方微博 | 高级检索  
     


Progressive damage and nonlinear analysis of pultruded composite structures
Affiliation:1. CENTEC – Centre for Marine Technology and Ocean Engineering, Instituto Superior Técnico, Universidade de Lisboa, Portugal;2. CERIS – Civil Engineering Research and Innovation for Sustainability, Instituto Superior Técnico, Universidade de Lisboa, Portugal;3. IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico (IST), Universidade de Lisboa, Portugal;1. University of Palermo, Department of Civil, Environmental, Aerospace, Materials Engineering, Viale delle Scienze, 90128 Palermo, Italy;2. School of Mechanical and Aerospace Engineering – Queen’s University Belfast, Ashby Building, Stranmillis Road, Belfast BT9 5AH, United Kingdom;1. ICIST, Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;2. LAETA, IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;1. Department of Bridge Engineering, Tongji University, Shanghai, China;2. Department of Civil and Environment Engineering, University of California, Irvine, CA, USA;3. School of Civil Engineering, Changsha University of Science & Technology, Hunan, China;4. Department of Civil and Environment Engineering, Rice University, TX, USA;1. ICIST, Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;2. LAETA, IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
Abstract:This study combines a simple damage modeling approach with micromechanical models for the progressive damage analysis of pultruded composite materials and structures. Two micromodels are used to generate the nonlinear effective response of a pultruded composite system made up from two alternating layers reinforced with roving and continuous filaments mat (CFM). The layers have E-glass fiber and vinylester matrix constituents. The proposed constitutive and damage framework is integrated within a finite element (FE) code for a general nonlinear analysis of pultruded composite structures using layered shell or plate elements. The micromechanical models are implemented at the through-thickness Gaussian integration points of the pultruded cross-section. A layer-wise damage analysis approach is proposed. The Tsai–Wu failure criterion is calibrated separately for the CFM and roving layers using ultimate stress values from off-axis pultruded coupons under uniaxial loading. Once a failure is detected in one of the layers, the micromodel of that layer is no longer used. Instead, an elastic degrading material model is activated for the failed layer to simulate the post-ultimate response. Damage variables for in-plane modes of failure are considered in the effective anisotropic strain energy density of the layer. The degraded secant stiffness is used in the FE analysis. Examples of progressive damage analysis are carried out for notched plates under compression and tension, and a single-bolted connection under tension. Good agreement is shown when comparing the experimental results and the FE models that incorporate the combined micromechanical and damage models.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号