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Free delivery. Arrives by Friday, Oct Pickup not available. About This Item We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it. See our disclaimer. Learn how ART and ADT can reduce cost, time, product recalls, and customer complaints This book provides engineers with the techniques and tools they need to use accelerated reliability testing ART and accelerated durability testing ADT as key factors to accurately predict a product's quality, reliability, durability, and maintainability during a given time, such as service life or warranty period.
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Customer Service. In The Spotlight. Another way to accelerate tests is to determine the time wasted in the test. For example, an automobile company specified an 8-hour thermal cycling test to verify solder joints were robust to extreme thermal cycles. The test specified maximum ramp rates of 4C per minute.
At each temperature, the product dwelled for 2 hour. This is captured in figure 1. To identify wasted test time, the thermal response of an engine control module was measured in a thermal shock chamber.
The internal module temperatures near the printed circuit board followed an exponential distribution. A way to reduce test time is to increase stress levels during the test.
This method works until the higher stresses causes a new failure mode. The Physics of Failure for a failure mode of the part relates the aging of the part in the field to the aging of the part during a test. Some stress examples are. Generally, a product development program specifies a suite of tests to verify product function and reliability. The Physics of Failure approach can be applied to many of the tests.
Accelerated Reliability and Durability Testing Technology - Wavesound Pty Ltd
An electronic engine controller is mounted in the engine compartment of a vehicle where it operates at different temperatures. These temperatures are dictated by the local ambient conditions, the duration of the trip, and the engine loads. A proposed distribution of temperatures is captured in table 1. For a 95 th percentile customer operation of 7, hours, these operating percentages may be converted to time at the different temperatures. The physics of failure model that describes the aging of electronic components is the Arrhenius model, equation 1.
The acceleration factor associated with testing at C instead of C is This calculation is repeated for each row, yielding table 2.
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The 10 year life requirement of hours for this engine controller has been reduced to hours, or about 78 days. For reliability test, this plan is reasonable.