An empirical model to describe performance degradation for warranty abuse detection in portable electronics

作者：Oh Hyunseok; Choi Seunghyuk; Kim Keunsu; Youn Byeng D^*; Pecht Michael

来源：Reliability Engineering & System Safety, 2015, 142: 92-99.

DOI：10.1016/j.ress.2015.04.019

• Accelerated life test
• Liquid damage indicator
• Performance degradation model
• Warranty abuse detection

Portable electronics makers have introduced liquid damage indicators (LDIs) into their products to detect warranty abuse caused by water damage. However, under certain conditions, these indicators can exhibit inconsistencies in detecting liquid damage. This study is motivated by the fact that the reliability of LDIs in portable electronics is suspected. In this paper, first, the scheme of life tests is devised for LDIs in conjunction with a robust color classification rule. Second, a degradation model is proposed by considering the two physical mechanisms (1) phase change from vapor to water and (2) water transport in the porous paper for LDIs. Finally, the degradation model is validated with additional tests using actual smartphone sets subjected to the thermal cycling of -15 degrees C to 25 degrees C and the relative humidity of 95%. By employing the innovative life testing scheme and the novel performance degradation model, it is expected that the performance of LDIs for a particular application can be assessed quickly and accurately.

• 出版日期2015-10