Accelerated Test Techniques

2000 ◽  
Vol 43 (2) ◽  
pp. 21-25 ◽  
Author(s):  
Mike Raymond
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Methods ◽  
Vibration Test ◽  
Accelerated Test ◽  
Element Analysis ◽  
Individual Test ◽  
Pneumatic Impact ◽  
Considerable Debate ◽  
Series Of Experiments

Currently there is considerable debate over the relevance and adequacy of emerging vibration test methodologies. This paper details a controlled series of experiments designed to evaluate the nature and consistency of failures produced from several test methodologies including single-axis step stress, skewed-fixture step stress, pneumatic impact, and finite element analysis. Details regarding the test article, individual test methods, and a summary of conclusions are presented.

Finite element analysis of a vibration test bed frame

2017 ◽  
Vol 59 (2) ◽  
pp. 183-187 ◽  
Author(s):  
Dong Lei ◽  
Rui Jiang ◽  
Pengxiang Bai ◽  
Feipeng Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Vibration Test ◽  
Test Bed ◽  
Element Analysis

Die design by a void index in multi-pass drawing

2002 ◽  
Vol 216 (11) ◽  
pp. 1043-1049 ◽  
Author(s):  
T Kuboki ◽  
H Furuta ◽  
H Yoshikawa ◽  
Y Neishi ◽  
M Akiyama
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Void Fraction ◽  
Void Growth ◽  
Cold Working ◽  
Die Design ◽  
Element Analysis ◽  
Series Of Experiments

Die design was optimized for suppressing the void growth in multi-pass drawing. The void index to evaluate the void fraction in multi-pass drawing was first proposed, based on the well-known equation to predict the fracture limit in cold working. Using finite element analysis, the influence of die geometries on the void index was investigated and dies were designed to have the effect of suppressing void with the least minimum die length. A series of experiments was then carried out to verify the validity of the numerical analysis. The densities of drawn bars were measured and voids in microstructures were observed to verify the validity of the proposed void index.

Effect of Osteoporosis on Natural Frequencies in Mouse Femur: Vibration Test and Micro-CT Based Finite Element Analysis

2006 ◽  
Vol 326-328 ◽  
pp. 851-854 ◽  
Author(s):  
Yoon Hyuk Kim ◽  
Chang Hwan Byun ◽  
Taek Yul Oh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mesh Generation ◽  
Natural Frequencies ◽  
Treated Group ◽  
Vibration Test ◽  
Micro Ct ◽  
Element Analysis ◽  
Generation Algorithm ◽  
The Finite Element Analysis

In this study, the change of the natural frequencies in mouse femurs with osteoporosis was investigated based on a vibration test and a finite element. Three groups of the femurs include the osteoporotic group, the treated group and the normal group. In the vibration test, the natural frequencies were measured by the mobility test. For the finite element analysis, the micro finite element model of the femur was reconstructed using the Micro-CT images and the Voxel mesh generation algorithm. From the results, the averaged natural frequencies in the osteoporotic group were the highest, followed by those in the treated group. The finite element models were validated within 15% errors by comparing the natural frequencies in the finite element analysis with those in the vibration test. The developed Micro-CT system, the Voxel mesh generation algorithm, the presented finite element analysis, and vibration test could be useful for the investigation of the structural change of the bone tissue, and the diagnosis and the treatment in the osteoporosis.

Numerical and Experimental Approach for Rectangular Cup of Li-Ion Battery Container with Extreme Aspect Ratio

2007 ◽  
Vol 340-341 ◽  
pp. 689-694 ◽  
Author(s):  
Tae Wan Ku ◽  
Ho Yeun Ryu ◽  
June Key Lee ◽  
Beom Soo Kang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Drawing Process ◽  
Element Analysis ◽  
Multi Stage ◽  
Analysis Scheme ◽  
Narrow Width ◽  
Series Of Experiments ◽  
Li Ion ◽  
Good Agreement

The main goal of this study was to develop the technique of process design and manufacturing for a rectangular deep drawn cup with very narrow width by using finite element analysis scheme and a series of experiments. The manufacturing process of this rectangular cup required several intermediate steps to generate the final shape. The multi-stage deep drawing process was applied to finite element analysis, and a continuous progressive press was employed in a series of experiments. Final specifications of the rectangular deep drawn cup were length of 33.70mm, height of 48.30mm and width of 3.46mm, respectively. In this study, finite element analysis for this drawing process was carried out from the first to the seventh stage, and a series of practical experiment was performed. These simulated results of the rectangular cup were compared with the prototypes of the experiments in view of the deformed shape in each mid-part. The results of finite element analysis showed good agreement with those from the experiments.

scholarly journals Real and Simulated Mechanical Tests

2015 ◽  
Vol 13 ◽  
pp. 160-167
Author(s):  
Mihai Gabriel Matache ◽  
Petru Cardei ◽  
Gheorghe Voicu ◽  
Valentin Vladut ◽  
Raluca Sfaru ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Testing ◽  
Mechanical Test ◽  
Mechanical Tests ◽  
Test Methods ◽  
Element Analysis ◽  
Physical Test ◽  
The Finite Element Analysis ◽  
Physical Tests

This paper presents the results obtained by the authors when applying mechanical test methods that are validated using fatigue testing under simulated regime with finite element analysis. In addition to the mostly mandatory physical tests, the simulated regime testing can validate emerging conclusions. Virtual testing conclusions (computer simulated via Cosmos finite element analysis software), strengthen, complement and increase the accuracy of physical test conclusions. During the investigation of the physical test results, there are cases where the simulated physical test is not always explainable. This paper presents a case study conducted on special constructed screws that are subjected to fatigue and verified using the finite element analysis. It presents the possibility for practical application of simulated tests in order to redesign structures that fail during physical tests.

Applications of Multi-Point Mirror Supporting

2013 ◽  
Vol 475-476 ◽  
pp. 1555-1558
Author(s):  
Ren Shan Zhuo ◽  
Dong Ge Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Studies ◽  
Design Requirement ◽  
Element Analysis ◽  
Primary Mirror ◽  
Supporting System ◽  
System A ◽  
Series Of Experiments ◽  
Supporting Structures

Primary mirror (PM) supporting system design is one of the key components to the design of a telescope. This paper presents applications of extended multi-point supporting structures that are employed in ground based theodolites, 3 points positioning-9 points supporting system and 18 points supporting system. A number of theoretical studies have been performed using Finite Element Analysis (FEA) on each supporting system, in which the extended multi-point supporting system to 0.6-m and 1-m diameter primary mirror is particularly focused. Analyzing Zerodur major mirrors with a diameter to thickness ratio less than 7.3, deformation due to supporting gives an RMS value less than 6-nm which is 24% of the design requirement of 60-nm. Series of experiments have also been conducted using 4-D interferometer. The deformation due to supporting of major mirror has been predominantly suppressed mainly by deformation during the fabrication process. This indicates that the above supporting systems perform an excellent task under given conditions.

Study on Fiber Laser Assisted Truing and Dressing of Diamond Wheel In-Process

2008 ◽  
Vol 53-54 ◽  
pp. 255-258 ◽  
Author(s):  
Yan Wang ◽  
Shi Ming Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Fiber Laser ◽  
Diamond Wheel ◽  
Dressing Method ◽  
Element Analysis ◽  
Field Simulation ◽  
The Finite Element Analysis ◽  
Series Of Experiments

A novel truing and dressing method, namely fiber laser assisted truing and dressing diamond wheel, is proposed to overcome the shortcomings associated with conventional mechanical dressing methods, ELID and ECD methods. A series of experiments have been conducted to prove that it achieves both high truing efficiency and good dressing quality. The finite element analysis of temperature distribution in fiber laser assisted truing and dressing diamond wheel using ANSYS is performed by author. Temperature field simulation helps to select optimized parameters under certain conditions.

Sign in / Sign up

Export Citation Format

Share Document