The main parameters affecting the assembly stress of clamps were derived through theoretical formulas and analyzed. Further more

the factors affecting the assembly stress of the clamps were systematically analyzed and researched by test method. In the test

the effects of bolt tightening torque

loading times

and assembly plans on the stress of the clamps were tested and statistically analyzed by using 3 types of clamps with 5 samples of each type as the test object. According to the research results

the surface of the clamp near the bolt hole was a stress concentration position. The stress of the clamp decreased with the increase of loading times

but the repeated loading times should not be too much

otherwise the local area of the clamp had large deformation and wear. The test results also showed that the method of adding a 2 mm gasket had the best effect on reducing the stress level of the clamp

and the reduction rate can reach 468%. In contrast

the reduction rate was 364% and 286% respectively by means of loading after restricting the displacement of the clamp and the method of correction after loading.