299 research outputs found
Steeb Hall
No full textEntry created by John Herrick May 6, 1972.John H. Herrick Archives: Documenting Structures at The Ohio State UniversityThe University Archives has determined that this item is of continuing value to OSU's history.Steeb Hall is located at 70 West 11th Avenue. This structure was officially named "Steeb Hall" by the Board of Trustees on September 1, 1958, in memory of Business Manager and Secretary of the Board of Trustees Carl E. Steeb. It is also known as East Addition to Baker Hall and Building No. 4, 11th Avenue Residence Halls for Men, and Carl E. Steeb Hall. All of the dormitories south of West 12th Avenue are frequently referred to as the "South Dorms"
Direct and Indirect Measurement of Complex Poisson's Ratio - Direct Measurement in Tension
No full textThis data set contains directly determined complex Poisson's ratio from axial and transversal strain measurements. Here, the axial and transverse strains were measured locally with strain gauges (K-CXY3-0015-3-350-O, HBK, Darmstadt, Germany) on cylindric polymethyl methacrylate (PMMA, EH-Design, Wörrstadt, Germany) samples with a diameter of d = 5 mm.
Frequency measurements were performed with a rheometer (MCR 702, linear motor, Anton-Paar, Graz, Austria) in the range of 1 Hz to 100 Hz with an axial strain of 0.01 % at constant temperatures in the range of 15 °C to 105 °C. 500 periods were measured per frequency and recorded using a measuring amplifier (Universal Amplifier MX1615B, HBK, Darmstadt, Germany).
Transversal and axial strain is then measured on the PMMA sample with strain gauges in tension mode.
The material response in the time domain is transformed to the frequency domain using the Fast Fourier Transform. This gives the axial and transverse amplitude as well as the axial and transverse phase shift. With the variable from the frequency domain, the complex Poisson's ratio is calculated in post-processing.
The data set contains the calculated complex Poisson's ratio of three measured PMMA samples
micro-XRCT data set of Carrara marble with artificially created crack network: fast cooling down from 600°C
No full textmicro-XRCT data set (projection and reconstructed images) of a Carrara marble core with a diameter of 5 mm. The sample was extracted with a water-cooled diamond drill from a bigger sample with a diameter of 30 mm and a length of 80 mm which was before subjected to following thermal treatment to initiate cracks:
Starting at room temperature (20°C) the sample was heated up with a rate of 3 K/min to 600°C. After a holding time of 2 hours at this temperature, the sample was subsequently quenched in water at room temperature (20°C)
micro-XRCT data set of Carrara marble with artificially created crack network: slow cooling down from 600°C
No full textmicro-XRCT data set (projections and reconstructed images) of a Carrara marble core with a diameter of 5 mm. The sample was extracted with a water-cooled diamond drill from a bigger sample with a diameter of 30 mm and a length of 80 mm which was before subjected to following thermal treatment to initiate cracks:
Starting at room temperature (20°C), the sample was heated up with a rate of 3 K/min to 600°C. After a holding time of 2 hours at 600°C, the sample was subsequently slowly cooled down in the closed oven back to room temperature (20°C)
Steeb House
No full textEntry created by John H. Herrick August 25, 1972.John H. Herrick Archives: Documenting Structures at The Ohio State UniversityThe University Archives has determined that this item is of continuing value to OSU's history.Steeb House was originally located on the site of the present President's Residence (Bldg. 959). For indexing purposes, the original location of this structure was arbitrarily listed as 250 West 12th Avenue. Steeb House was moved to 198 West Eleventh Avenue in order to clear the site for the erection of the President's Residence. This structure was never officially named by the Board of Trustees. It was also known as the Astronomer's Residence, the Astronomer's House, the Observatory Residence, the Secretary's Residence, the Emerson McMillin Observatory Dwelling House, and the Lord, H.C., Residence
micro-XRCT data set of Carrara marble with artificially created crack network: fast cooling down from 500°C
No full textmicro-XRCT data set (projection and reconstructed images) of a Carrara marble core with a diameter of 5 mm. The sample was extracted with a water-cooled diamond drill from a bigger sample with a diameter of 30 mm and a length of 80 mm, which was previously subjected to the following thermal treatment to initiate cracks:
Starting at room temperature (20°C), the sample was heated up at a rate of 3 K/min to 500°C. After a holding time of 2 hours at this temperature, the sample was subsequently quenched in water at room temperature (20°C).
Additionally, a segmentation result, into solid and crack regions, is provided using the U-Net model based on the code provided by Lee et al. (2021, 2022). Note that the segmentation result significantly overestimates the crack volume as described and discussed in detail in Lee et al. (2022) and Ruf et al. (2025). A way to tackle this problem is shown in the related publication Ruf et al. (2025)
Direct and Indirect Measurement of Complex Poisson's Ratio - Direct Measurement in Compression
No full textThis data set contains directly determined complex Poisson's ratio from axial and transversal strain measurements. Here, the axial and transverse strains were measured locally with strain gauges (K-CXY3-0060-3-350-O, HBK, Darmstadt, Germany) on cylindric polymethyl methacrylate (PMMA, EH-Design, Wörrstadt, Germany) samples with a diameter of d = 30 mm.
Dynamic mechanical analysis (DMA) was performed with the piezoelectric actuator (8P-035.20P, Physik Instrumente, Karlsruhe, Germany) driven by the high power amplifier (E-482, Physik Instrumente, Karlsruhe, Germany). Small strain amplitudes
excitation in the frequency range from 0.1 Hz to 1000 Hz are performed. To ensure the oscillation around a strain amplitude, a static preload is applied by a universal testing machine (RM50, Schenk, Germany).
Transversal and axial strain is then measured on the PMMA sample with strain gauges in compression mode. The material response in the time domain is transformed to the frequency domain using the Fast Fourier Transform. This gives the axial and transverse amplitude as well as the axial and transverse phase shift. With the variable from the frequency domain, the complex Poisson's ratio is calculated in post-processing.
The data set contains the calculated complex Poisson's ratio of three measured PMMA samples
micro-XRCT datasets of stochastically reconstructed 3D porous media micromodels manufactured by additive manufacturing
No full textThis dataset contains micro X-ray Computed Tomography (micro-XRCT) scan data sets (projection, reconstructed, and binarized images) of 3D porous media micromodels manufactured by additive manufacturing using the Material Jetting (MJ) method.
The micromodel geometries were designed using the stochastic model proposed by Quiblie (1984), Adler et al. (1990), and Hyman et al. (2014). For this study, four samples were fabricated, all possessing the same porosity of 0.45, but with varying correlation lengths (id: 15, 25, 35, and 45) that define the pore size distribution. The four cylindrical samples have a length of 50 mm and a diameter of 16 mm. For more details, see the related publication Lee et al. (2023)
The samples were completely scanned. Due to the limitation of the field of view at the required resolution, first the bottom part followed by the top part of the respective sample was scanned. Reconstruction was carried out separately for the top and bottom scans. Merging of the bottom and top parts was performed based on the reconstructed images. During the merging process, duplicated slices were naturally eliminated. The grayscale images obtained after the reconstruction and merging processes underwent segmentation, distinguishing between solid phase and pore space regions based on intensity values. Subsequently, the misclassified voxels resulting from the inherent noise in the micro-XRCT data were adjusted accordingly by assessing the connectivity between pixels (isolated pixels were reclassified to the neighboring class).
Simulations using the lattice Boltzmann method to determine the permeability of the scanned mircomodels can be found in the related dataset Lee et al. (2023)
Direct and Indirect Measurement of Complex Poisson's Ratio - Indirect Measurement in Torsion and Tension
No full textThis data set contains indirectly calculated complex Poisson's ratio by determining the complex Young's E* and complex shear modulus G* from torsion and tension measurements. The measurements were performed on cylindric polymethyl methacrylate (PMMA, EH-Design, Wörrstadt, Germany) samples with a diameter of d = 3 mm. Frequency measurements were performed with a rheometer (MCR 702, linear motor, Anton-Paar, Graz, Austria) in a angular frequency range of 0.628 rad/s to 188 rad/s with an axial strain of epsilon = 0.01 % and shear strain of gamma = 0.01 % at constant temperatures in the range of 15 to 105 °C. The Elastic Viscoelastic Correspondence Principle (EVCP) is applied to calculate the complex Poisson's ratio
Numerical investigation results of 3D porous structures using stochastic reconstruction algorithm
No full textThis dataset contains the outcomes of conducted numerical simulations, rooted in designs generated using a stochastic algorithm devised by Quiblie (1984), Adler et al. (1990), and Hyman et al. (2014).
Moreover, the investigation employed Lattice Boltzmann simulation, as used in previous study by Psihogios et al. (2007), where the simulations were focused on determining the permeability of the formulated domains. These domains encompassed a diverse array of porosities (0.15, 0.25, 0.35, and 0.45) and a range of correlation lengths (lambda : 15, 25, 35, and 45) that define pore size distributions. Additionally, to evaluate the influence of domain size, numerical simulations were carried out across a spectrum of domain sizes ranging from 100 to 700.
Furthermore, the numerical results derived from micro X-ray computed tomography scans of four micromodels (porosity : 0.45; lambda : 15, 25, 35, and 45) manufactured by additive manufacturing have also been incorporated within this dataset, for details cf. the realated dataset Ruf et al. (2023) and publication Lee et al. (2023)
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