Life Time Estimation and Reliability Model for Cellulose Insulation

Since the life time estimation and prediction of materials/products is very time-consuming, so it is necessary to do accelerated tests. In this paper, accelerated thermal air ageing test has been carried out at three different temperatures, 120, 140 and 160 centigrade in the ageing time. Due to rather coordinated variations and correlate to time, tensile strength has been chosen as a significant indicator to determine the life time of paper insulations. Life time comes to an end when this parameter decreases to the half of its primary amount Therefore tensile strength test on cellulose paper insulation has been done in different thermal stresses and it has been used in new model of life time (or ageing) estimation. New life model has been formulated and called power-exponential model. This model in life time estimations obtained which have good accuracy in comparison to other models such as Arrhenius model. Also we show that is possible to estimation the reliability of paper insulation under thermal stress using this accelerated ageing test. Therefore exponential distribution that it is simple distribution and very common in reliability is used for application coupled with the new model.