scholarly journals Masonry and Earthquakes: Material Properties, Experimental Testing and Design Approaches

10.5772/29280 ◽  
2012 ◽  
Author(s):  
Thomas Zimmermann ◽  
Alfred Strauss
Keyword(s):  
Material Properties ◽  
Experimental Testing

Using Indentation Test to Evaluate the Properties of Metallic Material with Strain Aging

2015 ◽  
Vol 751 ◽  
pp. 131-136
Author(s):  
Jie Tang ◽  
Mao Cheng ◽  
Guo Gen Huang ◽  
Hong Shu ◽  
Hui Ting Xu
Keyword(s):  
Nondestructive Testing ◽  
Experimental Verification ◽  
Material Properties ◽  
Strain Aging ◽  
Experimental Testing ◽  
Indentation Test ◽  
Metallic Materials ◽  
Metallic Material ◽  
Testing Method ◽  
Nondestructive Testing Method

In this paper, research on a testing method of indentation test proposed by F M Haggag is discussed first, and the experimental testing research on metallic material properties with strain aging is carried out and discussed using indentation test. The authors proposed to use indentation test to measure the properties of metallic materials with strain aging embrittlement based on experimental verification. And it provides a possibility to measure the properties of metallic materials with strain aging using nondestructive testing method.

Kinematic Precision Scaling With Physical Errors in Miniaturization of Four-Bar Polymer Compliant Machines

2006 ◽  
Vol 129 (5) ◽  
pp. 951-960
Author(s):  
R. J. Chang ◽  
Y. L. Wang
Keyword(s):  
Numerical Analysis ◽  
Material Properties ◽  
Compliant Mechanism ◽  
Experimental Testing ◽  
Signal To Noise Ratio ◽  
Kinematic Model ◽  
Experimental Tests ◽  
Signal To Noise ◽  
Compliant Joints ◽  
Noise Ratio

A precision-scaling kinematic model with the effects of physical error is investigated in the miniaturization of four-bar polymer machines with compliant joints. A pseudolinkages model (PLM) for the multiple-links compliant machine is formulated. A scaling formulation of the multiple-links compliant machine and its associated PLM is developed. A method for scaled-up test and scaled-down analysis of the compliant mechanism with the considerations of physical errors of fabrication processes, material properties, and experimental tests is proposed. By defining an index of signal-to-noise ratio, the performance of the miniature realization under physical errors is evaluated. The applications of the scaling PLM for the miniature realization of a compliant machine are illustrated by performing both numerical analysis and experimental testing on four-bar compliant polyethylene machines.

scholarly journals Numerical prediction of mechanical properties of zirconium alloy with hydrides using finite element method

Energetika ◽  
2018 ◽  
Vol 64 (1) ◽  
Author(s):  
Remigijus Janulionis ◽  
Gintautas Dundulis ◽  
Rita Kriūkienė ◽  
Albertas Grybėnas
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Zirconium Alloy ◽  
Experimental Testing ◽  
Zirconium Alloys ◽  
Numerical Prediction ◽  
Alternative Methods ◽  
Zirconium Hydride ◽  
Fe Method

During nuclear power plant (NPP) operation, degradation effects like ageing, corrosion, fatigue, and others may significantly impact component integrity. One of the degradation mechanisms is hydrogen absorption. High levels of hydrogen in zirconium alloys can lead to the formation of zirconium hydrides and that can influence material properties. Therefore, determination of material properties under different levels of hydrogen concentration in zirconium alloys is important. It is not always possible to conduct an experimental testing. Therefore, there is a need for alternative methods for determination of material properties. This article presents the numerical prediction of material properties of zirconium 2.5% niobium alloy with hydrides. According to the objective of the work, numerical prediction was performed using the finite element (FE) method. This was done by creating a finite element model of zirconium hydride embedded in zirconium alloy. The geometry and size of hydride were measured from a real specimen. The size of zirconium alloy surrounding the hydride was selected in such a way that hydride volume part in the model would match experimental measurements. The prognosis results were compared with the experimental data.

scholarly journals Hourglass-shaped specimen: compressive strength of concrete and mortar (numerical and experimental analyses)

2016 ◽  
Vol 9 (4) ◽  
pp. 510-524 ◽  
Author(s):  
U. T. BEZERRA ◽  
S. M. S. ALVES ◽  
N. P. BARBOSA ◽  
S. M. TORRES
Keyword(s):  
Material Properties ◽  
Failure Modes ◽  
Experimental Testing ◽  
Cementitious Materials ◽  
Cement Ratio ◽  
Modes Of Failure ◽  
Mode Of Failure ◽  
Compressive Strength Of Concrete ◽  
Cylindrical Samples ◽  
Negligible Influence

Abstract Cylindrical specimens whose diameter is equal to half its height have been used worldwide. The statistical scattering in experimental testing of cementitious materials is a phenomenon known in literature and one reason is linked to the geometry of the specimens, which implies the possibility of different failure modes. This paper shows the evaluation of an hourglass-shaped sample , in which the highest stress occurs at the centre of the specimen, with negligible influence of stress distribuition from its ends. An amount of 260 cylindrical and hourglass samples were tested, with varying water/cement ratio and age. FEM analyses showed that stress in the central part of the hourglass specimens is 2.25 higher than that present at its ends. Modes of failure occured in differente ways in cylindrical specimens, whereas only one mode of failure was verified in hourglass specimens. The cylindrical samples showed bimodal frequency distribution, demonstrating the influence of the central part (material properties) and of its ends (boundary conditions), while the hourglass displayed a Gaussian distribution.

scholarly journals Finite element analysis of mechanical response of a bed side rail

2006 ◽  
Vol 54 (2) ◽  
pp. 59-66
Author(s):  
Petr Koňas ◽  
Milan Šimek
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Properties ◽  
Efficient Solution ◽  
Mechanical Response ◽  
Experimental Testing ◽  
Furniture Design ◽  
Element Analysis ◽  
Test Room ◽  
Side Rail

According to non-existence of mechanical material properties for selected combination of materials it is appropriate to give a notice, that suggested solution should be examined in test-room of furniture by related norms. The suggested verification was finally realized on furniture test-room by Departure of Furniture, Design and habitation and approved availability of suggested numerical solution for defined tasks. If we take into account large amount of variants, which were modelled by this method (and which are not mentioned in this project) without requirements of experimental testing for each suggestion it is appropriate to remind the significant financial saving, due to realized numerical simulations which allowed to find efficient solution and which may not be attainable by experimental way (mainly with regard to financial severity).

Towards a Safer Design of Helmets: Finite Element and Experimental Assessment

2016 ◽  
Author(s):  
Sari Kassar ◽  
Sarah Siblini ◽  
Bilal Wehbi ◽  
Omar Abro ◽  
Mutasem Shehadeh
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Experimental Testing ◽  
Linear Acceleration ◽  
Road Accidents ◽  
Micro Structure ◽  
Experimental Assessment ◽  
Liner Material ◽  
Ratchet Mechanism ◽  
Motorcycle Helmets

Motorcycle helmets are vital to protect from recurrent road accidents as they prove crucial in reducing brain trauma. This research piece presents a new and plausible bio-inspired design affined to the foam liner material and structure in helmets. The proposed liner design is inspired from animal horn micro-structure and tubule arrangement. An innovative drop-testing apparatus is presented with a spring-ratchet mechanism for experimental testing. The aim is to validate the new design by meeting the ECE 22.05 standard for motorbike helmets using peak linear acceleration and HIC criteria. Experimental results are partly verified against FEA simulations for two proposed samples. Further samples call for more complex simulations at a later stage to best describe material properties and structures.

Strain Gage Ramifications on Mistuning in As-Manufactured Models and Experimental Testing

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Daniel L. Gillaugh ◽  
Alexander A. Kaszynski ◽  
Jeffrey M. Brown ◽  
Joseph A. Beck ◽  
Joseph C. Slater
Keyword(s):  
Material Properties ◽  
State Of The Art ◽  
Experimental Testing ◽  
Model Identification ◽  
Finite Element Models ◽  
Strain Gages ◽  
Wave Excitation ◽  
Engine Operation ◽  
Optical Topography ◽  
Engine Development

Abstract Blade-mounted strain gages are vital during rig and engine development to ensure safe engine operation. However, they also enable a change in dynamics of integrally bladed rotors (IBRs). State-of-the-art IBR dynamic response predictions are accomplished using as-manufactured models (AMMs) generated via optical topography measurements and mesh morphing. Two AMM finite element models (FEMs) are created of a 20-bladed IBR. One FEM has no strain gages present, where the second FEM includes strain gages on six blades. Traditionally, strain gages and lead wires are treated as the same material property as the IBR itself. It will be shown that the inclusion of strain gages in AMM's using this method changes the IBR's predicted mistuning. An alternative AMM approach is developed that changes the material properties of the finite elements attributed to the strain gages. The predicted mistuning for each AMM is accomplished using the fundamental mistuning model identification (FMM ID), where the predicted mistuning will be compared to both traveling wave excitation (TWE) experiments and a rotating, single stage compressor rig. Findings show mistuning predictions of the nonstrain gaged AMM compare far better to the experiments compared to the inclusion of the strain gages in the AMM. Additionally, altering material properties of the strain gages in the AMM improve mistuning prediction compared to treating the strain gages as the parent IBR material. Therefore, AMM should be acquired using clean, nonstrain gaged rotors or the material properties of strain gaged elements need to be altered to more accurately model the component.

Strain Gage Ramifications on Mistuning in As-Manufactured Models and Experimental Testing

2019 ◽  
Author(s):  
Daniel L. Gillaugh ◽  
Alexander A. Kaszynski ◽  
Jeffrey M. Brown ◽  
Joseph A. Beck ◽  
Joseph C. Slater
Keyword(s):  
Material Properties ◽  
Traveling Wave ◽  
State Of The Art ◽  
Experimental Testing ◽  
Finite Element Models ◽  
Strain Gages ◽  
Wave Excitation ◽  
Engine Operation ◽  
Optical Topography ◽  
Engine Development

Abstract Blade mounted strain gages are vital during rig and engine development to ensure safe engine operation. However, they also enable a change in dynamics of integrally bladed rotors (IBR). State-of-the-art IBR dynamic response predictions are accomplished using as-manufactured models (AMM) generated via optical topography measurements and mesh morphing. Two AMM finite element models (FEMs) are created of a 20 bladed IBR. One FEM has no strain gages present, where the second FEM includes strain gages on six blades. Traditionally, strain gages and lead wires are treated as the same material property as the IBR itself. It will be shown that the inclusion of strain gages in AMM’s using this method changes the IBR’s predicted mistuning. An alternative AMM approach is developed that changes the material properties of the finite elements attributed to the strain gages. The predicted mistuning for each AMM is accomplished using the Fundamental Mistuning Model (FMM ID), where the predicted mistuning will be compared to both Traveling Wave Excitation (TWE) experiments and a rotating, single stage compressor rig. Findings show mistuning predictions of the non-strain gaged AMM compare far better to the experiments compared to the inclusion of the strain gages in the AMM. Additionally, altering material properties of the strain gages in the AMM improves mistuning prediction compared to treating the strain gages as the parent IBR material. Therefore, AMM should be acquired using clean, non-strain gaged rotors or the material properties of strain gaged elements need to be altered to more accurately model the component.

Numerical and Experimental Testing of Composite Rings for Reciprocating Compressor Valves

2013 ◽  
Author(s):  
Claudio Annicchiarico ◽  
Alberto Babbini ◽  
Renzo Capitani ◽  
Pierluigi Tozzi
Keyword(s):  
Numerical Simulation ◽  
Material Properties ◽  
Experimental Testing ◽  
Reciprocating Compressor ◽  
Short Fibers ◽  
Test Rig ◽  
New Material ◽  
University Of Florence ◽  
The University ◽  
Critical Class

Valves are one of the most critical class of components for the reliability of reciprocating compressors. Many failures of reciprocating compressor valves are due to valve ring failure. Investigating the failure mode of rings is complicated because of the ring composite material properties, which randomly and locally range from orthotropic to anisotropic due to the random disposition of the reinforcement, usually consisting of short fibers. In this paper, a cooperation between GE Oil & Gas and the University of Florence, the results of a numerical simulation campaign will be presented, along with its correlation with the experimental evidence arising from a purpose-built test rig. This work guided the design of a new material for rings, whose characteristics have been tailored based on the results of this experimental and numerical campaign.

Fatigue Assessment of High Loaded Bolted Bar Connection Using Strain-Life Approach

2006 ◽  
Vol 324-325 ◽  
pp. 711-714 ◽  
Author(s):  
Srečko Glodež ◽  
Marko Knez ◽  
Janez Kramberger ◽  
Boris Aberšek
Keyword(s):  
Service Life ◽  
Material Properties ◽  
Reasonable Agreement ◽  
Computational Analysis ◽  
Experimental Testing ◽  
High Strength ◽  
Local Strain ◽  
Fatigue Tests ◽  
Bolted Connection ◽  
Life Evaluation

The paper deals with the problem of service life evaluation of counterweight bar bolted connection by means of computational analysis and experimental testing. Computational analysis has been performed using the local strain-life approach (ε-N), where appropriate material properties for treated high strength steel S1100Q has been determined previously. Experimental fatigue tests of bars were carried out in a specially constructed hydraulic pulsation machine. Comparison of computational and experimental results shows a reasonable agreement.

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