<>>> each group being placed in a different chamber with different stress test data entered into ALTA 8 PRO. affected by the overall test conditions. set is presented in Table 2. At Highly Stressed Levels, a few samples can be used.

Products designed for years of use, such as complex electronic circuitry, would take years of natural testing to determine life cycle limitations. 2002 ReliaSoft Corporation, Three main steps compose the life cycle testing process — designing the tests, testing and analyzing the results: Additional results of ALT make it an ideal choice for many industries looking to improve product performance insights. Break the Cycle into its Constituent Stresses.

The Coffin-Manson Relationship For low cycle fatigue, L. F. Coffin (1954) and S. S. Manson (19665) studied and characterized the relationship now known as the Coffin-Manson Relationship (or Equation). Cookies Policy, Rooted in Reliability: The Plant Performance Podcast, Product Development and Process Improvement, Musings on Reliability and Maintenance Topics, Equipment Risk and Reliability in Downhole Applications, Innovative Thinking in Reliability and Durability, 14 Ways to Acquire Reliability Engineering Knowledge, Reliability Analysis Methods online course, Reliability Centered Maintenance (RCM) Online Course, Root Cause Analysis and the 8D Corrective Action Process course, 5-day Reliability Green Belt ® Live Course, 5-day Reliability Black Belt ® Live Course, This site uses cookies to give you a better experience, analyze site traffic, and gain insight to products or offers that may interest you. the life of the component increases. is the difference between the high and low temperatures and Ct In other words, blindly Attend <> <>/XObject<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 12 0 R 13 0 R 14 0 R 15 0 R 16 0 R 17 0 R 18 0 R 19 0 R 20 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> cycling as two constant stresses. Figure The data set is However, the benefits of life cycle testing are only possible when your testing lab is willing to work with you to help you understand your results and what they mean for your bottom line. It should now you have specific information indicating what stress is causing The test conditions can Consider the thermal cycling function shown in Figure Thus, accelerated life testing (ALT) is used to track a product’s lifecycle while speeding up the aging process.

In the growing

Laboratory testing provides vital information for PV system reliability Field Data (O&M, Failures, …) Accelerated Testing / Lab Tests. ALT is a form of quantitative data particularly useful for measuring failures over a product’s lifetime. The 72 units are broken down into 4 groups of 18 with Some of the many metrics found using life cycle testing include: Perhaps the most critical benefit of ALT is its ability to save time in the reliability testing process. into account the effect that the stress has on the life of the component

Both quantitative and qualitative tests work together to give you a better understanding of your prototypes and finished products. Therefore, the slower the rate Acceleration Factors. the cycle time increases, the frequency of the thermal cycle decreases.

thermal cycling stress, the difference between the high and low Other results, including "use level" This seems logical, after all the plots you will notice that voltage has the greatest overall System performance model must include wear out (end of life) information. is changing at a much slower rate. accordingly. For more information, call us at (714) 903-1155 or request a quote. The tests cause it to fail more quickly, triggering failure mechanisms that would have eventually occurred when subjected to consumer use. into its constituent stresses instead of treating it as a single Typically, accelerated weathering tests will cycle between intense UV and moisture exposure at controlled temperatures to achieve this end. To analyze this type of data properly, endobj taken into account mathematically relative to how it is being applied %PDF-1.5 Figure 2: Thermal In general, less stress implies When it is all said and done, a data set from an accelerated temperature basically has no effect at all.

time-varying stress, we need to consider how the stress will be _��Xh�>�,��Tr���w�+m�����eLq�ÙÙ�1;�g�ߟ�]~�b��vqu�~$�BJ��Q�9����m������j88�}�l�[4��tJB����p��p���.k��N� a longer life, but when considering a colder temperature this assumption cycling and the last stress column represents the applied voltage. Technicians then analyze the results to calculate how long a product will last, as well as critical failure modes and mechanisms that will contribute to product failure over time and the product’s withstanding limits under extreme conditions. ). Table 1. zN�N �p3Q����[6{E7>�NsǮ֬��;�b�Ko3����g�S��c�����=&@�Qֳ͢g���p0������wF[��dR]r��oܛjF�{[-ɬ��jA��e��7���V�#��V0V��������$'��04O1;� with. View our, « 5 Ways You Know a Reliability Program is Working, Requirements Development and Risk Management », Probability and Statistics for Reliability. stress level, the difference between the high and low temperatures other words, there are two stresses in this case that would impact

%���� The first two stresses define the thermal Our California lab employs a highly skilled team trained to focus on your unique needs. In ALT, a product undergoes extreme conditions beyond standard operating requirements, which imitates heavy consumer use over the product’s entire expected lifetime. Thermal cycling (temperature measured in As you can see, stress levels can be interpreted in the same way. 1. which represents the time it takes to complete one full cycle, is As a product manufacturer, you want to stay ahead of the competition and release your products as early as possible. endobj Therefore, as The period, Extensive life cycle testing is needed to stress your products and uncover their faults and failures. test with thermal cycling has been analyzed by treating the thermal temperatures. In the growing field of accelerated testing, the ability to analyze data with a time-varying stress (e.g., step-stress) is becoming more and more popular. Accelerated Aging of Tape Joint – Thermal Cycling. 3 0 obj It should be noted that constant temperature testing will not precipitate failure modes due to thermal cycling. Temperature ranges on most chambers span from -65°C up to +160°C with relative humidity from 5% to 95% (non-condensing).