TY - JOUR

T1 - A finite element-based continuum damage model for mechanical joints in fiber metal laminates under static and fatigue loading

AU - Gerendt, Christian

AU - Hematipour, Maryam

AU - Englisch, Nils

AU - Scheffler, Sven

AU - Rolfes, Raimund

N1 - The work presented in this paper was funded by the Federal Ministry of Education and Research of the Federal Republic of Germany under the project LENAH - Hybrid laminates and nanoparticle reinforced materials for improved rotor blade structures (grant number 03SF0529A) and by the Federal Ministry of Economics and Energy under the project HANNAH - Challenges of the industrial application of nanomodified and hybrid material systems in lightweight rotor blade construction (grant number 0324345A).

PY - 2023/5/15

Y1 - 2023/5/15

N2 - In this study the theory and experimental validation of a novel continuum damage modeling framework for highly predictive strength and fatigue analyses of mechanical joints in fiber-reinforced polymer (FRP) composites with local metal hybridization is presented. In contrast to existing damage modeling approaches for mechanical joints in fiber metal laminates (FML), the herein presented framework is able to predict the joint's failure mode both under static and fatigue loading, which is an indispensable feature for the identification of damage tolerant lightweight joint designs. For this purpose, the laminate's constituent materials (i.e. the metallic inlays and the FRP plies) are simulated individually by physically motivated static-fatigue continuum damage models. Here, the elastic and plastic mechanical strain energy is utilized to compute the materials’ damage parameters. In this way, the models are (i) able to suppress any mesh-dependence during material softening, (ii) able to account for damage initiation and growth, and (iii) applicable both in the low- and high-cycle fatigue regime. The algorithms are implemented as user-material (UMAT) subroutine for the commercial finite element software ABAQUS. The damage modeling framework is validated for open hole tension and T-bolt joint setups both under static and fatigue loading.

AB - In this study the theory and experimental validation of a novel continuum damage modeling framework for highly predictive strength and fatigue analyses of mechanical joints in fiber-reinforced polymer (FRP) composites with local metal hybridization is presented. In contrast to existing damage modeling approaches for mechanical joints in fiber metal laminates (FML), the herein presented framework is able to predict the joint's failure mode both under static and fatigue loading, which is an indispensable feature for the identification of damage tolerant lightweight joint designs. For this purpose, the laminate's constituent materials (i.e. the metallic inlays and the FRP plies) are simulated individually by physically motivated static-fatigue continuum damage models. Here, the elastic and plastic mechanical strain energy is utilized to compute the materials’ damage parameters. In this way, the models are (i) able to suppress any mesh-dependence during material softening, (ii) able to account for damage initiation and growth, and (iii) applicable both in the low- and high-cycle fatigue regime. The algorithms are implemented as user-material (UMAT) subroutine for the commercial finite element software ABAQUS. The damage modeling framework is validated for open hole tension and T-bolt joint setups both under static and fatigue loading.

KW - Continuum damage mechanics

KW - Experimental validation

KW - Fiber metal laminates

KW - Finite element method

KW - Mechanical joints

UR - http://www.scopus.com/inward/record.url?scp=85149287480&partnerID=8YFLogxK

U2 - 10.1016/j.compstruct.2023.116797

DO - 10.1016/j.compstruct.2023.116797

M3 - Article

VL - 312

JO - Composite structures

JF - Composite structures

SN - 0263-8223

M1 - 116797

ER -