Implementation of progressive failure for fatigue based on cycle-dependent material property degradation model
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ORIGINAL PAPER
Implementation of progressive failure for fatigue based on cycle-dependent material property degradation model Joshuah Nakai-Chapman1 · Young H. Park1
· James Sakai1
Received: 21 June 2020 / Accepted: 2 September 2020 © Springer Nature Switzerland AG 2020
Abstract Anisotropic composite materials have been extensively utilized in mechanical, automotive, aerospace and other engineering areas due to high strength/weight ratio, superb resistance to corrosion and excellent thermos-mechanical properties. As the use of composite materials increases, determination of material properties, mechanical analysis and failure of the structure become essential for the design of composite structure. In particular, the fatigue failure is important to ensure that structures can survive in harsh environmental conditions. The non-homogeneous character of composites induces diverse failure modes of the constituent including fiber fracture, matrix cracking, fiber-matrix interface failure, and delamination, which makes their fatigue behavior very complex in comparison with traditional engineering materials. In this study, based on different failure modes of a unidirectional ply under multiaxial stress states, a progressive damage theory is extended to simulate fatigue failure in composite laminates subjected to cyclic loadings. A cycle-dependent material property degradation model was employed to predict deterioration of the material properties due to arbitrary stress state and ratio. This cycle-dependent material property degradation rule is implemented into user subroutine USDFLD in ABAQUS through which cycle-dependent material degradation states are updated over fatigue loading. The present computational implementation is tested by comparing the experimental fatigue behavior of a 30-degree off-axis specimen with the simulation result obtained by the present implantation. The comparison between the experimental and simulation results demonstrates the successful simulation capability of the present implementation. Keywords Fiber-reinforced composite · Three-dimensional failure · Fatigue life · Material degradation
1 Introduction The benefits of composite materials, high strength/stiffnessto-weight ratio, superb thermos-mechanical properties and exceptional resistance to corrosion, have led engineers and scientists to continue to push their boundaries and find better material combinations, better manufacturing methods, and new design and analysis methods. However, modern engineering composites still present a challenge for analysis and design even after decades of research and use in manufacturing. Unlike metals which are homogenous and isotropic, composite materials are non-homogenous and anisotropic and thus their behavior under loading is much more complicated and more difficult to predict. Fatigue life is one area
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Young H. Park [email protected] Mechanical and Aerospace Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA
where continued research is needed to allow more efficient use o
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