초가속 수명 시험과 Virtual Qualification을 이용한 자동차용 전장 부품의 신뢰성 평가

Highly Accelerated Life Test(HALT) uses stimulation to find out the weakness of the product thus to improve the quality. The current HALT test has its limitations. HALT is used to quickly expose the weakness of the product, but it doesn't predict the life of product. Virtual qualification is used to identify the dominant failure sites and to predict the life of the component under environmental/operational loads. In this study, HALT was performed to find out the weakness of the Auto Temperature Controller and to measure the strains at weakness points in order to predict the life of product. And a 2-D finite element model of weakness point was built to determine the strains in the critical solder joint due to flexure induced by vibration. The life of product was predicted at each vibration level using finite element method.