Abstract
AbstractBiaxial tensile tests allow the investigation of damage evolution in sheet molding compound under biaxial stress states. This is of particular interest due to the different damage phenomena in composite materials. A key challenge is to find a suitable specimen design, because typical cruciform specimens fail in the arms before damage occurs in the area of interest which is the area of the biaxial stress state in the center area of the specimen. A specimen was found which enables the observation of anisotropic stiffness degradation which is one phenomenon of damage. In this proceedings the results of the experiments are presented.
Highlights
Sheet molding compound (SMC) as a discontinuous fiber reinforced composite combines high strength and stiffness and a low density with an economical production and is, an ideal lightweight material
The focus of the present work lies on biaxial tensile testing of SMC
Biaxial stress and strain states cover a wide range of application loads
Summary
Sheet molding compound (SMC) as a discontinuous fiber reinforced composite combines high strength and stiffness and a low density with an economical production and is, an ideal lightweight material. The detailed understanding of the mechanical behavior of SMC presents, a challenge to composite material science. The focus of the present work lies on biaxial tensile testing of SMC. The cruciform specimen design is the basic prerequisite for suitable experiments. In [5] and [6] different specimen designs are investigated and compared with respect to different optimality criteria, where the most important criterion is the highest strain in the area of interest which is a measure for the likelyhood to observe damage in this area. The present work shows investigations with this specimen where anisotropic stiffness degradation is observable
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