The exact stress–strain curve can be directly identified from uniaxial tension experiments up to the point of onset diffuse necking. To gain insight into post-necking hardening response metals, other experimental methods such as bulge, compression or torsion are typically employed. Here, we introduce idea using surround DIC obtain accurate specimen shape measurements tensile specimens with rect...

The blade pitch of a Vertical Axis Wind Turbine can have profound impact on the aerodynamic loading experienced by turbine. This in turn impacts structural loads and performance machine. In order to characterize effects changing pitch, studies are conducted with fixed offsets from neutral position open jet wind tunnel TU Delft. Measurements strain gages bonded turbine struts used estimate norma...

A high strain rate tensile testing technique for sheet materials is presented which makes use of a split Hopkinson pressure bar system in conjunction with a load inversion device. With compressive loads applied to its boundaries, the load inversion device introduces tension into a sheet specimen. Two output bars are used to minimize the effect of bending waves on the output force measurement. A...

An algorithm is discussed that may be used to estimate tare loads of wind tunnel strain–gage balance calibration data. The algorithm was originally developed by R. Galway of IAR/NRC Canada and has been described in the literature for the iterative analysis technique. Basic ideas of Galway’s algorithm, however, are universally applicable and work for both the iterative and the non–iterative anal...

For application in structural health monitoring, a folded patch antenna has been previously designed as a wireless sensor that monitors strain and crack in metallic structures. Resonance frequency of the RFID patch antenna is closely related with its dimension. To measure stress concentration in a base structure, the sensor is bonded to the structure like a traditional strain gage. When the ant...

In this work, an image colorization algorithm based on convolutional neural networks is explored as approach to predict tensile plane-strain field components of microstructures featuring porosity defects. For the same, various shapes, sizes, area fractions and number densities were sampled gage section ASTM-E8 sized numerical specimens whose deformation was simulated in plane strain mode using ...

Fatigue-crack-growth (FCG) rate tests were conducted on compact specimens made of an Inconel-718 alloy to study the behavior over a wide range in load ratios (0.1 6 R 6 0.95) and a constant Kmax test condition. Previous research had indicated that high R (>0.7) and constant Kmax test conditions near threshold conditions were suspected to be crack-closure-free and that any differences were attri...