scholarly journals Life Prediction on a T700 Carbon Fiber Reinforced Cylinder with Limited Accelerated Life Testing Data

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Ma Xiaobing ◽  
Zhang Yongbo
Keyword(s):  
Carbon Fiber ◽  
Test Data ◽  
Life Prediction ◽  
Rupture Life ◽  
Accelerated Life Testing ◽  
Accelerated Life Test ◽  
Life Testing ◽  
Life Test ◽  
Failure Data ◽  
Accelerated Life

An accelerated life testing investigation was conducted on a composite cylinder that consists of aluminum alloy and T700 carbon fiber. The ultimate failure stress predictions of cylinders were obtained by the mixing rule and verified by the blasting static pressure method. Based on the stress prediction of cylinder under working conditions, the constant stress accelerated life test of the cylinder was designed. However, the failure data cannot be sufficiently obtained by the accelerated life test due to the time limitation. Therefore, most of the data presented to be high censored in high stress level and zero-failure data in low stress level. When using the traditional method for rupture life prediction, the results showed to be of lower confidence. In this study, the consistency of failure mechanism for carbon fiber and cylinder was analyzed firstly. According to the analysis result, the statistical test information of carbon fiber could be utilized for the accelerated model constitution. Then, rupture life prediction method for cylinder was proposed based on the accelerated life test data and carbon fiber test data. In this way, the life prediction accuracy of cylinder could be improved obviously, and the results showed that the accuracy of this method increased by 35%.

The Development, Dynamic Simulation and Verification of a Half-Vehicle Model for Durability Testing

1994 ◽  
Author(s):  
D. A. Belfiore ◽  
B. J. Gilmore ◽  
J. C. Wambold
Keyword(s):  
Dynamic Simulation ◽  
Accelerated Life Testing ◽  
Accelerated Life Test ◽  
Life Testing ◽  
Life Test ◽  
Vehicle Model ◽  
Transit Buses ◽  
Accelerated Life ◽  
Dynamic Simulation Model ◽  
Durability Testing

Abstract Accelerated life testing analysis for transit buses requires a dynamic simulation model using road profiles as excitation inputs. This paper presents the modeling and parameter estimation required to conduct such a dynamic simulation of a small bus. The simulation preclude the necessity of measuring actual vehicle response traversing portions of selected roads. The results from the simulation correlate well with actual results in both magnitude and frequency distribution and thus, may be used for accelerated life test purposes.

Research on a New Model for Accelerated Life Test of Pneumatic Cylinders

2010 ◽  
Vol 40-41 ◽  
pp. 760-765 ◽  
Author(s):  
Chuan Dong Bai ◽  
Yan Wang ◽  
De Yi Wang
Keyword(s):  
Test Data ◽  
Accelerated Life Testing ◽  
Accelerated Life Test ◽  
Pneumatic Cylinder ◽  
Life Test ◽  
Working Pressure ◽  
Accelerated Life ◽  
Long Lifetime ◽  
Log Linear ◽  
Pneumatic Cylinders

Pneumatic cylinders, as a long lifetime product, are used continuously under normal conditions. So Accelerated Life Testing is an important tool to get information quickly on lifetime which is achieved by subjecting the test cylinders to conditions that are more severe than the normal ones. This paper firstly analyze the failure mechanism of pneumatic cylinder, then based on the General Log-Linear relationship and Weibull distribution, describes a model for multiple stress-type accelerated life data analysis. The paper gives the parameter statistical method of the mode by using likelihood theory. Based on the test data from ALT of pneumatic cylinders which adopt four test stresses including air temperature, motion frequency, working pressure and operation velocity, the parameter of the model are fitted. According to the test data and the estimated model, the paper extrapolates the pneumatic cylinder’s lifetime information under the normal user level.

Analysis of Accelerated Life Test Data Involving Two Failure Modes

2011 ◽  
Vol 211-212 ◽  
pp. 1002-1006 ◽  
Author(s):  
R. Jiang
Keyword(s):  
Shape Parameter ◽  
Failure Modes ◽  
Risk Model ◽  
Accelerated Life Testing ◽  
Accelerated Life Test ◽  
Life Testing ◽  
Life Test ◽  
Life Distribution ◽  
Accelerated Life ◽  
Step Procedure

This paper presents an approach to analyze accelerated life testing (ALT) data involving two failure modes. The approach first transforms the ALT dataset into two new datasets that correspond to individual failure modes. Each transformed dataset is modeled using a two-step procedure, and the resulted models associated with individual failure modes are combined into a competing risk model. The approach is illustrated using the ALT data of industrial heaters from the literature. The analysis shows that the shape parameter of the life distribution can change with stress level.

A Study on Procedures of the Accelerated Life Testing for Hose Assemblies

2005 ◽  
Vol 297-300 ◽  
pp. 1870-1875
Author(s):  
Y.B. Lee ◽  
Hyoung Eui Kim ◽  
J.H. Park ◽  
J.M. Ko
Keyword(s):  
Accelerated Life Testing ◽  
Test Method ◽  
Life Testing ◽  
Life Test ◽  
Life Distribution ◽  
Burst Test ◽  
Manufacture Process ◽  
Accelerated Life ◽  
Long Time ◽  
Impulse Pressure

There are several types of life test method for hose assemblies. The two major tests used for hose assemblies are impulse test and burst test. And magnification adjustment of impulse pressure, heating of testing oil and repetitive motions of bending and straightening of testing hose are also performed for accelerating the life. According to the manufacture process of hose and swaging process of fitting, there is a difference in the life of hose assemblies from minimum 7 times to maximum 40 times during the life test in the same functioning condition. Like this, the life test of hose which has a wide scope of life distribution gives a problem that observation should take a long time to find out the existence of the bursting from the beginning of the test to the completion of bursting of hose assemblies. Therefore, this research proposes a process of concentrating on the defective section of hose assemblies and maximizing the life acceleration by giving ‘Knockdown stress’ to hose assemblies just until before the hose assemblies get out of order.

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