Experimental Investigation of Process Specific Material Behavior of Thermoplastic Hybrid Yarn Textiles

2015 ◽  
Vol 18 (3) ◽  
pp. 397-402 ◽  
Author(s):  
Michael Krahl ◽  
Frank Adam ◽  
Teresa Möbius ◽  
Jana Kubitz ◽  
Niels Modler
Keyword(s):  
Experimental Investigation ◽  
Material Behavior ◽  
Hybrid Yarn ◽  
Specific Material

Finite Element Analysis on Nitinol Medical Applications

2002 ◽  
Author(s):  
Xiao-Yan Gong ◽  
Alan R. Pelton
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Element Analysis ◽  
Highly Nonlinear ◽  
Device Applications ◽  
Specific Material

Nitinol, an alloy of about 50% Ni and 50% Ti, is a very unique material. At constant temperature above its Austenite finish (Af) temperature, under uniaxial tensile test, the material is highly nonlinear and capable of large deformation to the ultimate strain on the order of 15%. This material behavior, known as superelasticity, along with its excellent biocompatibility and corrosion resistance, makes Nitinol a perfect material candidate for many medical device applications. However, the nonlinear material response also requires a specific material description to perform the stress analysis. The user developed material subroutine from HKS/West makes the simulation of the Nitinol devices possible. This article presents two case studies of the nonlinear finite element analysis using ABAQUS/Standard and the Nitinol UMAT.

Experimental Investigation of Coke Drum Material Behavior Under Complex Thermal-Mechanical Loading

2011 ◽  
Author(s):  
Jie Chen ◽  
Zihui Xia
Keyword(s):  
Experimental Investigation ◽  
Mechanical Stress ◽  
Mechanical Loading ◽  
Axial Stress ◽  
Circumferential Stress ◽  
Pressure Vessels ◽  
Material Behavior ◽  
Damage Mechanisms ◽  
Delayed Coking ◽  
Stress Cycling

Coke drums are vertical pressure vessels used in the delayed coking process in petroleum refineries and oil sands plants. Significant temperature variation during the delayed coking process causes damage in coke drums in the form of bulging and cracking. In order to better understand the damage mechanisms, an experimental investigation of coke drum material behavior under various thermal-mechanical loading conditions was performed. A thermal-mechanical material testing system is successfully designed and implemented. Six types of various thermal-mechanical cyclic tests were performed: 1. cyclic thermal loading under constant uniaxial stress; 2. in-phase thermal and mechanical stress cycling; 3. out-of-phase thermal and mechanical stress cycling; 4. fully-reversed uniaxial cyclic loading with in-phase thermal cycling; 5. in-phase thermal-axial stress cycling with constant circumferential stress; 6. in-phase thermal-axial stress cycling with mean stress. Some of theses tests are similar to the actual loading scenario experienced by the coke drums. The experimental findings lead to better understanding of the damage mechanisms occurring in coke drums such as bulging.

Investigation of Warm Prestress for the Case of Small ΔT During a Reactor Loss-of-Coolant Accident

1979 ◽  
Vol 101 (4) ◽  
pp. 298-304 ◽  
Author(s):  
F. J. Loss ◽  
R. A. Gray ◽  
J. R. Hawthorne
Keyword(s):  
Experimental Investigation ◽  
Statistical Analysis ◽  
Vessel Wall ◽  
Crack Extension ◽  
Crack Tip ◽  
Material Behavior ◽  
Virgin Material ◽  
Loss Of Coolant Accident ◽  
Loss Of Coolant ◽  
Failure Temperature

An experimental investigation was conducted to characterize the benefits of warm prestress (WPS) in limiting crack extension in the wall of a nuclear vessel during a LOCA-ECCS. The present research emphasized material behavior under conditions of a small ΔT between the temperature of WPS and the failure temperature as might occur during a LOCA. The results have demonstrated that fracture will not occur during a simultaneous unloading and cooling of the crack-tip region following WPS even though the critical KIc of the virgin material is achieved. Based on a statistical analysis, it is concluded that WPS produces an “effective” elevation in KIc; furthermore, it is suggested that this elevation will limit crack extension in the vessel wall so as to retain the coolant.

Do moods and expectancies have unique or interactive effects?: An experimental investigation

2014 ◽  
Author(s):  
Shane Close ◽  
Victoria Adkins ◽  
Kandice Perry ◽  
Katheryn Eckles ◽  
Jill Brown ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Interactive Effects

Visually-induced motion sickness: An experimental investigation

2004 ◽  
Author(s):  
Mustapha Mouloua ◽  
Janan Smither ◽  
Robert C. Kennedy ◽  
Robert S. Kenned ◽  
Dan Compton ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Motion Sickness ◽  
Visually Induced Motion Sickness ◽  
Induced Motion
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