Abstract:For highly innovative products the actual product use is often very uncertain. However, the uncertainty/variability in product use and its impact on product reliability has rarely been explored. The mismatch between the anticipated product use and the actual product use can lead to considerable unexpected technical and non-technical reliability risks. However, traditional reliability management techniques focus primarily on managing technical reliability risks. This situation results in an increasing amount of… Show more
“…As a result of the ion migration and dendrites growth, the surface insulation resistance (SIR) of the PCBs decreases significantly, which leads to a short circuit in the device and even catastrophic failure. PCBs under extreme environment (namely high humidity, temperature, and applied voltage) are prone to be unstable and ionized . Therefore, the severe operating environment creates new challenges to the reliability of PCBs.…”
In this paper, numerical control finished boards are employed as test samples to evaluate the effects of the environment and bias voltage on the surface insulation resistance of printed circuit boards. The results indicate that the surface insulation resistance degradation processes leading to failure exhibit a relative humidity threshold value, which is mostly related to temperature, test patterns, and bias voltage. Then, a humidity threshold model is built on the basis of electrochemical migration to quantify the relationship between the relative humidity threshold and conductor spacing and bias voltage under the controlled environments. Finally, experiments and tests have been carried out to validate the effectiveness and practicability of the model. Furthermore, the residual analysis is applied to check the fitting effect of the proposed model. According to the new model, the humidity threshold value can be obtained to provide the guidance for reliability problems in application. It is crucial to the design and deployment of reliable printed circuit boards. . Her main research interests include reliability analysis, reliability testing, reliability assessment, and reliability growth on numerical control system.Hangjun Zhang holds a Masters degree in Mechanical Engineering from the Tianjin University of Technology and Education, Tianjin, China. He is also a member
“…As a result of the ion migration and dendrites growth, the surface insulation resistance (SIR) of the PCBs decreases significantly, which leads to a short circuit in the device and even catastrophic failure. PCBs under extreme environment (namely high humidity, temperature, and applied voltage) are prone to be unstable and ionized . Therefore, the severe operating environment creates new challenges to the reliability of PCBs.…”
In this paper, numerical control finished boards are employed as test samples to evaluate the effects of the environment and bias voltage on the surface insulation resistance of printed circuit boards. The results indicate that the surface insulation resistance degradation processes leading to failure exhibit a relative humidity threshold value, which is mostly related to temperature, test patterns, and bias voltage. Then, a humidity threshold model is built on the basis of electrochemical migration to quantify the relationship between the relative humidity threshold and conductor spacing and bias voltage under the controlled environments. Finally, experiments and tests have been carried out to validate the effectiveness and practicability of the model. Furthermore, the residual analysis is applied to check the fitting effect of the proposed model. According to the new model, the humidity threshold value can be obtained to provide the guidance for reliability problems in application. It is crucial to the design and deployment of reliable printed circuit boards. . Her main research interests include reliability analysis, reliability testing, reliability assessment, and reliability growth on numerical control system.Hangjun Zhang holds a Masters degree in Mechanical Engineering from the Tianjin University of Technology and Education, Tianjin, China. He is also a member
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