Fatigue Life Analysis And Research Of Corner-filleted Flexural Hinges

Since the21st century, People has higher requirement for the safety of the product since the impact of economic globalization, and they hope the product has a better durability and higher reliability. Therefore, in view of the people’s growing material and cultural needs, industry began to pay more attention to the quality of the products. The service life of these products must be consistent with the provisions of the product life, it also requires a lot of test samples for fatigue test of products, so as to guarantee the quality of product and service life.Compliant mechanism motion process is actually the process of deformation of flexible components, for some simple compliant mechanism, only need a action, that is, only need a deformation for flexible body, therefore, using the static failure in the material mechanics theory can analyze its fatigue life. However, some compliant mechanism which we often used has to take over ten thousands deformation for the flexible component. And a alternating stress of flexible member would be produced when repeated games happen, while fatigue failure would occur when the alternating stress far lower than the limit stress, and because of the flexible hinge is the weakest link of compliant mechanism, easily because of fatigue failure cause damage products, this is what we don’t expect to happen. Therefore, it is important to take analysis for flexure hinge with theoretical and experimental.This paper aims at the Corner-filleted flexural hinges. First of all, using the finite element analysis method in combination with the critical surface fatigue criterion, the fatigue life analysis model was established, then solve it with the dichotomy; Follow, through the simulation test, the fatigue life curve and the influence of single factor on fatigue life was obtained; Finally, research is mainly focused on the influence of driving force, thickness, radius and width on its fatigue life., the orthogonal experiment was designed by analysis the orthogonal experiment data analysis, results showed that the driving force, thickness, radius of three parameters effect on fatigue life were highly significant highly significant, and more significantly, respectively. Besides the width is not significant, and the influence degree from big to small in turn was driving force, the radius to thickness and width.In this paper, the research work can provide support for the design of flexure hinge, avoids the unreasonable distribution of life in the process of design, which has great significance for the research and development of the compliant mechanism is of great significance.