Abstract
To ensure the usability of parts made of fiber-reinforced polymers, a lifetime assessment has to be made in an early stage of the development process. To describe the whole life cycle of these parts, continuous simulation chains can be used. From production to the end of the service life, all influences are mapped virtually. The later material strength is already given after the manufacturing process due to the process dependent fiber alignment. To be able to describe this fiber orientation within the lifetime assessment, this paper presents an approach for model calibration and data set determination to consider the local micro-structure. Therefore, quasi-static and cyclic tests were performed on specimens with longitudinal and transversal fiber orientation. A supplementary failure analysis provides additional information about the local micro-structure. The local fiber orientation is determined with µCT (micro computer tomography)-measurements, correlated to the extraction positions of the specimen, and implemented in a dataset. With an attached lifetime calculation on a demonstrator, a major influence of the local micro-structure on the calculation results can be shown. Therefore, it is indispensable to consider the local fiber orientation in the data set determination of short fiber reinforced polymers.
Highlights
Ever increasing requirements in terms of emission reduction, material utilization and light weight contribute to an increasing usage of short fiber reinforced thermoplastic composites instead of metals
To be able to describe this fiber orientation within the lifetime assessment, this paper presents an approach for model calibration and data set determination to consider the local micro-structure
Since the local material microstructure has a major influence on the mechanical behavior of inhomogeneous, anisotropic materials, such as fiber reinforced composites, all related influences must be considered in a lifetime assessment
Summary
Ever increasing requirements in terms of emission reduction, material utilization and light weight contribute to an increasing usage of short fiber reinforced thermoplastic composites instead of metals. To cover all effects during the product lifecycle, a simulation chain is established including the manufacturing process, the micro-structure simulation, and a lifetime assessment Within this simulation chain, several models and methods are combined to predict the lifetime (depending on the material), the load case, and the ambient conditions. To map the influence of fiber orientation in a simulation, several models are developed and described in literature Most of these models are based on the micro mechanical approaches, which go back to the work of Mori and Tanaka [13] and formulations for nonlinear mechanical material behavior according to Besson [14]. Most of these models focus on quasi-static material behavior and do not cover fatigue
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