Environmental Performance Testing System for Thermostructure Materials Applied in Aeroengines

2006 ◽  
Vol 313 ◽  
pp. 183-0 ◽  
Author(s):  
Li Tong Zhang ◽  
Lai Fei Cheng ◽  
Xin Gang Luan ◽  
Hui Mei ◽  
Yong Dong Xu
Keyword(s):  
Environmental Performance ◽  
Thermal Stresses ◽  
Performance Test ◽  
Performance Testing ◽  
Ceramic Matrix Composites ◽  
Test Methods ◽  
Testing System ◽  
Matrix Composites ◽  
Innovative Methodology ◽  
Service Environments

The conventional ultimate performance test by applying a component in its true application (i.e., in an engine) is often very expensive and impractical when dealing with developmental materials. Simpler, less expensive, and more practical test methods must be utilized. The present work aims toward the applications of an innovative methodology for testing environmental performance of advanced Ceramic Matrix Composites (CMCs) in the presence of combined mechanical, thermal, and environmental applied conditions. To obtain a comprehensive understanding of how a composite might perform in certain application environments, a newly developed environmental performance testing system, which is able to provide the fundamental damage information of the composites in simulating service environments including variables such as temperature, mechanical and thermal stresses, flowing oxidizing gases and high gas pressure, is proposed. The system comprises of two subsystems: (1) equivalent experimental simulating subsystem, and (2) wind tunnel experimental simulating subsystem. The evolution mechanisms of the composites properties and microstructures can be achieved by the former, and then be validated and modified by the latter. Various loading (e.g. fatigue, creep), various atmospheres (e.g. argon, oxygen, water vapor, wet oxygen and molten salt vapor) and various temperature conditions (e.g. constant or cyclic temperatures) can be conducted on the system. Some typical experimental results are presented in this paper. Large quantities of tests have demonstrated the extraordinary stability and reliability of the system.

Cumulative Damage Mechanics: Characterization, Modeling, and Interpretation of Progressive Failure in Ceramics and Composites

2004 ◽  
Author(s):  
Michael G. Jenkins ◽  
Paul E. Labossie`re ◽  
Jonathan A. Salem
Keyword(s):  
Damage Mechanics ◽  
Progressive Failure ◽  
Ceramic Matrix Composites ◽  
Test Methods ◽  
Cumulative Damage ◽  
Material Behavior ◽  
Matrix Composites ◽  
Damage Models ◽  
Novel Design ◽  
Nonlinear Energy

Ceramic matrix composites (CMCs) have evolved to exhibit inherent damage tolerance through nonlinear energy absorption mechanisms while retaining the desirable attributes of their monolithic structural ceramic counterparts. Mathematical (analytic and numeric) models together with experimental measurements of this damage absorption have aided in understanding the thermomechanical behavior of CMCs. This understanding has led to improved test methods, better predictive modeling of material behavior, appropriate processing methods, and finally novel design methodologies for implementing CMCs. In this paper, background on CMC damage is presented, damage measurement and damage models are discussed and finally probabilistic aspects of constituent materials that can be used to illustrate the cumulative damage behavior of CMCs are described.

Research on Chinese Codes and Standards of Heat Transfer Performance Testing for Heat Exchangers

2020 ◽  
Author(s):  
Bin Ren ◽  
Xiaoying Tang ◽  
Facai Ren ◽  
Jibing Wang ◽  
Bofeng Bai
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Performance Test ◽  
Heat Transfer Performance ◽  
Performance Testing ◽  
Test Methods ◽  
Transfer Performance ◽  
Factors Affecting ◽  
Nonlinear Fitting ◽  
Test Standards

Abstract Heat exchanger is a device that transfers heat between hot and cold fluids. Due to the different size and type, the actual heat transfer performance is usually not the same as the design value. Meanwhile, various heat exchangers using new types of heat transfer elements have emerged, bringing the difficulty to obtain the heat transfer performance by only theoretical calculation. Therefore, studying test methods and developing test standards for heat exchangers have become the research focus in many countries. In this paper, the basic principles of various performance test methods are firstly introduced, including Wilson plot method, equal Reynolds number method and nonlinear fitting method. Then the restrictions on the use of these methods and the factors affecting the test results are analyzed. Finally, the Chinese codes and standards of performance testing for heat exchangers are listed, including JB/T 10379-2002, GB/T 27698-2011 and TSG R0010-2019. The test methods used in GB/T 27698 are described in detail. The results show that GB 27698 mainly focus on the specification of testing systems and procedures and can test heat transfer performance of almost all types of heat exchangers in industry under different heat transfer modes. However, there are lack of formulas and methods for calculating uncertainty of testing results.

Simulated Environments Testing System for Advanced Ceramic Matrix Composites

2006 ◽  
Vol 3 (3) ◽  
pp. 252-257 ◽  
Author(s):  
Hui Mei ◽  
Laifei Cheng ◽  
Xingang Luan ◽  
Litong Zhang ◽  
Yongdong Xu ◽  
...  
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Testing System ◽  
Matrix Composites ◽  
Advanced Ceramic ◽  
Simulated Environments

Constituent Development for Higher-Temperature Capable Ceramic Matrix Composites

2018 ◽  
Author(s):  
M. K. Cinibulk ◽  
Z. D. Apostolov ◽  
E. E. Boakye ◽  
T. S. Key ◽  
D. S. King
Keyword(s):  
Stress Rupture ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Turbine Engine ◽  
Sic Fiber ◽  
The Matrix ◽  
Higher Temperature ◽  
Oxidation Resistant ◽  
Service Environments ◽  
And Behavior

This paper highlights research that is addressing the need for improved high-temperature-capable CMCs, with a focus on CMC constituents and an understanding of their processing, microstructure, and behavior in relevant service environments. The most pervasive lifetime and temperature limitations for SiC/SiC CMCs are related to oxidation, creep and stress rupture of the fibers, oxidation-induced instability of the fibermatrix interface, and instability of the matrix at temperatures > 1400°C. Consequently, we are addressing these shortcomings by developing technologies to enable higher-temperature capable SiC fiber, oxidation-resistant fiber-matrix interfaces, and improvements in processing of refractory matrices for both turbine engine and hypersonic applications.

Integrating the ASME Performance Test Code 19.1 Approach of Calculating Measurement Uncertainty With the Regression Based Test Methods for Reporting Photovoltaic System Performance

2015 ◽  
Author(s):  
Cecil Lawrence
Keyword(s):  
Uncertainty Analysis ◽  
Measurement Uncertainty ◽  
High Performance ◽  
Power Plants ◽  
Performance Test ◽  
Performance Testing ◽  
Test Methods ◽  
Photovoltaic System ◽  
Section 8 ◽  
Rating Method

Solar Photovoltaic (PV) power plants have high performance test measurement uncertainty due to instrument precision limitations and spatial variations associated with irradiance and soiling measurement. Accurate prediction of the measurement uncertainty is critical for both the Owner and the EPC contractor to appropriately manage their risk. While there are several methods for testing the performance of PV plants, regression analysis based methods, like the PVUSA Method and the PPI rating method, are widely used. However, there is limited guidance on uncertainty analysis when using these methods. Most utilities and power producers have familiarity with the ASME PTC 19.1 code for measurement uncertainty analysis and often require the guidelines of PTC 19.1 be followed for evaluating the measurement uncertainty for the performance testing of PV plants. However there is lack of published literature on using the ASME PTC 19.1 approach with regression based PV performance test methods. This paper expands on the limited guidance provided by ASME PTC 19.1 Section 8-6 for regression based analysis and presents a detailed approach of calculating measurement uncertainty for PV power plants when using regression based testing methods. The paper also presents the importance of obtaining a good regression fit to the measurement uncertainty and elaborates on methods to reduce the measurement uncertainty. The overall approach discussed in this paper was applied on performance testing of two large utility-scale PV plants.

scholarly journals ASME Code Rules and ASTM Standards Integration for Ceramic Composite Core Materials and Components1

2021 ◽  
Vol 2048 (1) ◽  
pp. 012020
Author(s):  
J W Geringer ◽  
Y Katoh ◽  
S Gonczy ◽  
T Burchell ◽  
M Mitchell ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Test Methods ◽  
Code Design ◽  
Matrix Composites ◽  
Asme Code ◽  
Ceramic Composite Materials ◽  
American Society

Abstract Fiber-reinforced ceramic matrix composites have many desirable properties for high-temperature nuclear applications, including excellent thermal and mechanical properties and reasonable to outstanding radiation resistance. Over the last 20 years, the use of ceramic composite materials has already expanded in many commercial nonnuclear industries as fabrication and application technologies mature. The new ASME design and construction rules under Section III, Subsection HH, Subpart B lay out the requirements and criteria for materials, design, machining and installation, inspection, examination, testing, and the marking procedure for ceramic composite core components, which is similar to the established graphite code under Section III, Subsection HH, Subpart A. Moreover, the general requirements listed in Section III, Subsection HA, Subpart B are also expanded to include ceramic composite materials. The code rules rely heavily on the development and publication of standards for composite specification, classification, and testing of mechanical, thermal, and other properties. These test methods are developed in the American Society for Testing and Materials Committee C28 on Advanced Ceramics with a current focus on ceramic composite tubes. Details of the composites code, design methodology, and similarities to the graphite code, as well as guidance for the development of specifications for ceramic composites for nuclear application and recent standard developments, are discussed. The next step is to “close the gap” to support licensing aspects by validating the code with benchmarking data.

ANALYSIS OF CERAMIC MATRIX COMPOSITES WITH BRIDGING CRACKS IN THE PRESENCE OF CREEP

1998 ◽  
Vol 22 (4B) ◽  
pp. 447-456
Author(s):  
V. Birman ◽  
L.W. Byrd
Keyword(s):  
Thermal Stresses ◽  
Tensile Load ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Effect Of Temperature ◽  
Uniaxial Tensile ◽  
Matrix Composites ◽  
Mechanical Loads ◽  
Aerospace Applications ◽  
Matrix Cracks

Ceramic matrix composites (CMCs) represent an attractive class of materials, particularly in aerospace applications where a combination of thermal and mechanical loads may present a challenge for a designer. An important feature of these materials is their ability to withstand damage without immediate failure. This emphasizes a significance of studies of damaged CMCs, particularly at high temperatures. In particular, the analysis of creep of CMCs with matrix cracks is important to accurately predict the response and reliability of such materials. The solution presented in this paper concentrates on creep in the presence of bridging cracks and uniaxial tensile load. Residual thermal stresses and the effect of temperature on the rate of creep are incorporated into the formulation.

The Research of Performance Test System of Seals in Hydraulic Support Column

2012 ◽  
Vol 468-471 ◽  
pp. 2542-2545
Author(s):  
Xi Zhang ◽  
Ping Zhao ◽  
Yu Bai
Keyword(s):  
Performance Test ◽  
Performance Testing ◽  
Hydraulic Cylinder ◽  
Test System ◽  
Testing System ◽  
Test Bed ◽  
Hydraulic Support ◽  
Practical Applications ◽  
Testing Method ◽  
Purchasing Process

In order to solve the problem that there is no appropriate testing method for the purchasing process of sealing washer in hydraulic support producing company at present, the author designed a test bed used to test the seal performance of hydraulic cylinder in the mine hydraulic support to provide database supports for purchasing sealing washer for hydraulic support manufacturers, by using the performance testing system of sealing washer worked upright column for hydraulic support. The introduction of the principles, constitutions and functions of the test bed will be shown in this paper. After a number of experiments, it is reflected by the practical applications that the test bed is operating stably, accurately and efficiently which could be used for testing sealing washer.

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