as cycles to failure for thermal shock and thermal cycling conditions in the range of 55?C to 125?C were compared. Projection to other temperature cycling ...
NASA Website
assemblies performed under different conditions, including ... rates are critical parameters and also affect cycles to failure. The NASA thermal cycling ...
... LIFE), HAZARDS, HIGH TEMPERATURE ... ENVIRONMENTAL TESTS, LIFE CYCLES ... STORAGE, AUSTRALIA, ACCELERATED TESTING, THERMAL ...
DTIC Science & Technology
For example, within Mil-STD-883, there are three levels of accelerated .... to failure. In the IPC report J-STD-012 (Joint Industry .... 129, 205, and 267 cycles. ...
... AGING(MATERIALS), HIGH TEMPERATURE ... THERMAL CYCLING TESTS, ACCELERATED TESTING, THERMAL ... SHELF LIFE, FOAM, GEL ...
This paper reviews the accelerated thermal cycling test methods that are currently used by industry to characterize the interconnect reliability of commercial-off-the-shelf (COTS) ball grid array (BGA) and chip scale package (CSP) assemblies. Acceleration...
National Technical Information Service (NTIS)
Cracking by thermal fatigue is its probable long-term failure mechanism, but it is not clear how to perform accelerated thermal-cycle tests to get a ...
May 1, 2002 ... Consequence of Cracked Die Failures. 3. Manufacturer ... CDI performed accelerated thermal cycle evaluation of NASA's residual uninstalled ...
Jan 23, 2001 ... These two bars pushed the coupons down onto the stationary ram with specified maximum deflections for mechanical cycling. ...
The influence of thermal cycling treatment on the mechanical and structural properties of low-carbon steels 08Kh2G2F and 08Kh2G2B was investigated. The specimens were hardened with lath martensite and a small quantity of bainite. Accelerated heating on an electric contact unit by direct passage of current was used for the ...
Energy Citations Database
The paper describes the principle of a thermal compressor, which is basically an ejector which utilizes the momentum of a high-velocity jet of vapor to entrain and accelerate a slower moving medium, and thereby achieve self-compression of the medium. Expressions describing the performance of thermal compressors are given. A solar ...
NASA Astrophysics Data System (ADS)
We report on an electron accelerator based on few-cycle (8 fs full width at half maximum) laser pulses, with only 40 mJ energy per pulse, which constitutes a previously unexplored parameter range in laser-driven electron acceleration. The produced electron spectra are monoenergetic in the tens-of-MeV range and virtually free of ...
PubMed
The accelerated thermal cycling facility at ESTEC is designed for testing of lightweight solar cell modules with an acceleration factor of 50 compared to low earth orbit conditions. A description of the principle and all technical aspects and critical areas are presented. These include thermal ...
A finite element model has been created to quantify the thermal fatigue damage of the CPV die attach. Simulations are used to compare to results of empirical thermal fatigue equations originally developed for accelerated chamber cycling. While the empirical equations show promise when extrapolated to the lower ...
In order to correctly interpret the observed emission from supernova remnants, one must find out how is the electron distribution partitioned into thermal and nonthermal component. Although the overall picture of the acceleration is generally accepted, the question "how does an electron start to accelerate" remains open and is the ...
For 20 Ah cylindrical cell with good thermal & cycling uniformity at beginning of life... ` Imbalance grows throughout life (T, Ah throughput, capacity loss) ` Acceleration...
National Renewable Energy Laboratory (NREL)
8 Accelerated Stress Test Failure Mode Thermal Cycles Broken interconnect Broken cell Solder bond failure Junction box adhesion Module open circuit - potential for arcing Damp...
An evaluation was made of thin film interfacial interconnections and insulating crossovers. The interconnections were subjected to -55C, 125C, and 200C storage for 1000 hrs. 100 thermal cycles from -65C to 125C; and an accelerated aging at 240C (Interfaci...
Nanostructured yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were produced by atmospheric plasma spraying. The microstructure of the sprayed coating was characterized by transmission electron microscope (TEM) and scanning electron microscope (SEM). The nano-coating had a higher porosity of ~25% than the conventional coating, which is mainly attributed to the ...
... thermal cycling. Flexural strength in high-fiber content specimens shows an increase with increased thermal cycling. Similar ...
A previously developed test design for accelerated aging of photovoltaic modules was experimentally evaluated. The studies included a review of relevant field experience, environmental chamber cycling of full-size modules, and electrical and physical evaluation of the effects of accelerated aging during and after the tests. The test ...
... Accession Number : ADD451974. Title : THERMAL SHOCK AND THERMAL CYCLING BEHAVIOR OF SILICON NITRIDE CERAMICS. ...
The objectives of the program were to: generate mechanical, thermal, and physical property test data for as-fabricated advanced materials; design and fabricate an accelerated thermal cycling chamber; and determine the effect of thermal cycling on thermomechanical properties ...
Recently proposed injector accelerator, Low Energy Ring (LER) for the LHC and fast cycling accelerators for the proton drivers (SF-SPS at CERN and DSF-MR at Fermilab) require that a new magnet technology be developed. In support of this accelerator program, a pair of power leads needs to be developed to close the ...
DOE Information Bridge
There are many aspects of the mechanical behavior of whisker reinforced alloys that are not well understood. The effects of thermal fatigue, for example, have been extensively studied for continuous-fiber composites but not for whisker composites. A model was developed here for thermal-fatigue damage in whisker-reinforced metal-matrix composites, taking ...
The successful operation of accelerator cavities has to satisfy both rf and mechanical requirements. It is highly desirable that electromagnetic, thermal and structural effects such as cavity wall heating and Lorentz force detuning in superconducting rf cavities can be addressed in an integrated analysis. Based on the SLAC parallel finite-element code ...
