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Abstract

The paper is basically focused on the process of form finding by the dynamic relaxation method (DRM) with the aid of computational tools that enable us to make many calculations with different inputs. There are many important input values with a significant impact on the course of the calculations and the resulting displacement of a structure. One of these values is Young’s modulus of elasticity. This value has a considerable impact on the final displacement of a grid shell structure and the resulting internal forces.

Abstract

Porous structures made of metal or biopolymers with a structure similar in shape and mechanical properties to human bone can easily be produced by stereolithographic techniques, e.g. selective laser melting (SLM). Numerical methods, like Finite Element Method (FEM) have great potential in testing new scaffold designs, according to their mechanical properties before manufacturing, i.e. strength or stiffness. An example of such designs are scaffolds used in biomedical applications, like in orthopedics’ and mechanical properties of these structures should meet specific requirements. This paper shows how mechanical properties of proposed scaffolds can be estimated with regard to total porosity and pore shape.

References ASTM E132 – 17. Standard Test Method for Poisson’s Ratio at Room Temperature. ASTM E111 – 17. Standard Test Method for Young’s Modulus, Tangent Modulus, and Chord Modulus. Ashikuzzaman, Md., Tarif Uddin, A., Zahidul, A., Altaf Hossain, Md. (2018). Effect of Brick Forming Load on Mechanical Properties of FlyAsh Bricks. Tr Civil Eng & Arch , 3 (2), 1–6. TCEIA.MS.ID.000157. DOI: 10.32474/TCEIA.2018.03.000157 Bednarski, L., Sienko, R., Howiacki, T. (2014). Oszacowanie wartosci i zmiennosci modulu sprezystosci betonu w istniejacej konstrukcji na podstawie

Abstract

Dynamical mechanical analysis yields information about the mechanical properties of a material as a function of deforming factors, such as temperature, oscillating stress and strain amplitudes. GaAs and Mn-doped GaAs at varied levels, used in making electronic devices, suffer from damage due to changes in environmental temperatures. This is a defective factor experienced during winter and summer seasons. Hence, there was a need to establish the best amount of manganese to be doped in GaAs so as to obtain a mechanically stable spin injector material to make electronic devices. Mechanical properties of Ga1-xMnxAs spin injector were studied in relation to temperatures above room temperature (25 °C). Here, creep compliance, Young’s moduli and creep recovery for all studied samples with different manganese doping levels (MDLs) were determined using DMA 2980 Instrument from TA instruments Inc. The study was conducted using displace-recover programme on DMA creep mode with a single cantilever clamp. The samples were prepared using RF sputtering techniques. From the creep compliance study it was found that MDL of 10 % was appropriate at 30 °C and 40 °C. The data obtained can be useful to the spintronic and electronic device engineers in designing the appropriate devices to use at 30 °C and above or equal to 40 °C.

Abstract

The Gabčíkovo hydroelectric power plant is located in a complicated geological environment (gravel sub-soil and a high groundwater level). Excavation work started after the withdrawal of water in the autumn of 1984 and lasted until the autumn of 1986. A basic geodetic control network with a special monument was founded before the excavation work began. This network served for the setting-out of the hydroelectric power plant as well as for the control of the excavation work. The repeated geodetic control measurements have been evaluated and presented at many seminars and conferences. Monitoring the horizontal and vertical stability of the geodetic control network during the general site excavation showed significant horizontal and vertical deformations. The paper is focused on an estimation of an effective Young's modulus of elasticity in the area studied.

. Wasé and E. Heier, “Fatigue crack growth thresholds—the influence of Young’s modulus and fracture surface roughness,” Int. J. Fatigue , vol. 20, no. 10, pp. 737–742, 1998. [51] S. Groh, S. Olarnrithinun, W. A. Curtin, A. Needleman, V. S. Deshpande, and E. Van der Giessen, “Fatigue crack growth from a cracked elastic particle into a ductile matrix,” Philos. Mag. , vol. 88, no. 30–32, pp. 3565–3583, Oct. 2008. [52] Y. Xiang, Z. Lu, and Y. Liu, “Crack growth-based fatigue life prediction using an equivalent initial flaw model. Part I: Uniaxial loading,” Int. J

Abstract

This study deals with experimental thermodynamic and rheological characterization of kaolin. Water sorption isotherms of kaolin were determined for three temperatures (30, 50 and 70°C). Desorption isotherms were fitted by using five models (GAB, BET, Henderson modified, Adam and Shove, Peleg) among the most used ones in literature. The GAB model was found to be the most suitable for describing the relationship between equilibrium moisture content and water activity for the whole range of temperature (30-70°C) and relative humidity(0-100%). Desorption enthalpy and entropy were determined. The desorption enthalpy decreases with increasing moisture content. The density and the shrinkage of the material and the Young’s modulus variations as a function of moisture content were determined experimentally. The Young modulus varies between 0.1 MPa and 14 MPa. The viscoelastic parameters of kaolin were also determined by using a series of Prony.

of the Knee. Knee Surgery & Related Research 28(4) (2016) 289–296. 22. Pal S., Design of Artificial Human Joints & Organs. Springer, 2014, 23–40. 23. Balijepalli S.K., Donnini R., Kaciulis S., Montanari R., Varone A., Young’s Modulus Profile in Kolsterized AISI 316L Steel. Materials Science Forum 762:183 (2013). 24. Human knee joint model from CT scan data, (source: https://grabcad.com/library/human-knee-1 availability on 05.04.2018). 25. Lai Y-S., Chen W-C., Huang C-H., Cheng C-K., Chan K-K., Chang T-K., The Effect of Graft Strength on Knee Laxity and Graft In

Abstract

A method of detecting honeycombing damage in a reinforced concrete beam using the finite element model updating technique was proposed. A control beam and two finite element models representing different severity of damage were constructed using available software and the defect parameters were updated. Analyses were performed on the finite element models to approximate the modal parameters. A datum and a control finite element model to match the datum test beams with honeycombs were prepared. Results from the finite element model were corrected by updating the Young’s modulus and the damage parameters. There was a loss of stiffness of 3% for one case, and a loss of 7% for another. The more severe the damage, the higher the loss of stiffness. There was no significant loss of stiffness by doubling the volume of the honeycombs.

Abstract

Samples made from Vanadis 6 PM ledeburitic tool steel were surface machined, ground and mirror polished. Prior the deposition, they were heat treated to a hardness of 60 HRC. Cr2N- and Cr2N/Ag-coatings were deposited by magnetron sputtering technique, using pure Cr and Ag targets, in a composite low pressure nitrogen/argon atmosphere and at a temperature of 500 °C. The contents of silver in Cr2N/Ag coatings were established 3, 7, 11 and 15 wt. %. Incorporation of silver in the Cr2N-matrix influence the growth rate, namely from the content of 11 wt. %. The nanohardness and Young´s modulus do not change until the content of 11 wt. % where slightly increased but further increasing of silver led to decreasing these values rapidly. The best adhesion was established for coatings with 3 and 7 wt. % of silver.