Study on Solving Contact Stress on the Blade Rabbet

The contact stress analysis is hard to be tested and calculated, but it is a very important difficulty for design. The contact stress distribution in the rabbet of the aircraft engine blade was determined by combining the experimental and numerical methods. The basic ideas were:1) using the experimental method to measure the stress or strain values of some points near by the contact surface of the blade rabbet; 2) using the numerical method to calculate stress distribution of the whole blade under the centrifugal load by exerting definite restriction conditions on the contact surface of blade rabbet and to work out contact stress distribution of the contact surface; 3) releasing the restriction conditions on the contact surface and exerting the contact load calculated on it,to calculate stress or strain distribution of the whole blade under the centrifugal load and the contact load and then compare the computed results with experimental ones; 4) modifying restriction conditions or calculation models and repeating the procedures above, until computed and experimental results be consistent well. The results indicate that the present method is rather exact to give load distribution on the contact surface. The rationality of restriction conditions can be judged simply and easily. Because of complexity of contact stress, it is necessary to study the problem further.