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The use of hat-shaped specimens for dynamic shear testing

Peirs J., Verleysen P., Degrieck J.

Foundations of Civil and Environmental Engineering

2008

No. 11

97-111

In recent decades, specimens with hat-shaped geometry have been used to study materials with respect to their shear behavior including strain localization and adiabatic shear banding (ASB). However, the interpretation of the experimental results is still not straightforward because of the complex stress distribution in the shear region of the specimen. More comprehensive use of the hat-shaped specimen is possible when a better description of the distribution and evolution of the stress state in the specimen is available. This paper presents the results of dynamic and static experiments on Ti-6Al-4V and numerical simulations in ABAQUS/Explicit. The stress, strain and temperature distribution and evolution is examined for specimens with varying dimensions. The aim is to identify the important factors that affect the experimental results.

Behaviour of yarn interacted with high-speed object under sideways-constraint

Vu Hung D., Degrieck J., Van Langenhove L., Kiekens P.

Autex Research Journal

2002

Vol. 2, no. 1

46--56

This paper presents an investigation of the dynamic behaviour of a yarn in an interaction with a high-speed object, for the lower warp sheet during the weaving process. The yarn movement on the object can be described in four stages from non-contact, contact, drop-off and withdrawal. A model is developed to predict this interaction, taking into account several factors such as yarn length, yarn tension, object speed, object orientation and object profile. A comparison of theoretical predictions and experimental measurements for different yarns indicates a good agreement. The theoretical model can be used to optimise the object profile in order to reduce the interactive yarn tension and to avoid any yarn damage.