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Bonded repair of composite structures in aerospace application: a review on environmental issues
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Advanced Book Search Browse by Subject. Make an Offer. As to the sample with opening, strain of the location far away from opening is somewhat lower than failure strain of the sample without opening. There is stress and strain concentration around opening, which is also the location where failure first occurs. The conservative quantity of the sample with 6 mm opening is 1.
It is a. Figure 1. Nominal strength change law for openings of different diameters and typical failure of sample. Figure 2. Typical stress-strain curves of samples without opening and sample with 6mm opening. When formula 2 is met, failure occurs on the plate with opening hole. Stress analysis is conducted under linear condition for the semi-infinite plate with opening hole, obtaining the ratio of the strength of plate with opening hole to that of plate without opening hole:.
As a geometric parameter relevant to the failure region, a specific physical interpretation has not yet been given for , which generally can be obtained by finite element calculation and test.
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Considering the stress distribution obtained by finite element method has some human assumption factors, in this paper, the characteristic dimension is obtained from the measured strain data of a test specimen with 6 mm opening hole under tensile failure load, which is 4. According to tensile and in-plane shear test specimen without opening hole, obtain that , , , substitute these data into the above formulas, obtain the ratio of the strength of plate with opening hole to that of plate without opening hole, which is 0. Thus, this shows that the point strength criterion, as a simple but effective forecasting method, has a good applicability in the test.
The reason why the theoretical result is slightly higher is that the directly used characteristic dimension measured from the test is slightly larger, which should include the influence of test error, dispersion of subsample and distinguishing method of singular data near the failure load. Correct the theoretical result, then a relatively identical and safe result can be obtained when.
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The characteristic dimension is relevant to several factors such as material, opening hole size, edge condition, etc. To different practical situations, it should be determined through a large number of tests. The bearing capacity of circular shaft is the key of thermal structure such as rudder and flaperon, etc.
The stress state near the position of opening hole is complicated, which needs to consider many factors. To ensure enough loading transfer capacity, the circular shaft is usually adapted as bolted joint with double-column and even multi-column opening hole.
The Strength Characters of C/C Composite Material with Opening Hole and Typical Application
So, it is necessary to analyze the effect of extruding and tensile load to each hole, and to ensure the bearing rationality of the hole in each column. Establish the relationship of ratio between the extruding and tensile stress of the loaded hole of shear bolted joint sample, which can reflect the combined action effect of the two. The formula is determined through below:.
According to the formula in related article   and using the test specimen with 8mm opening hole in this paper, the sketch map of failure envelope for a single opening hole under the combined action of tension and extrusion is shown in the figure below.
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Extrusion failure occurs on the joint structure in the grey OAB area, and tensile failure occurs on the joint structure in the white OBC area. By Figure 3 , tensile failure should be more attention for this sort of opening hole. For the actual circular shaft, factors need to be considered when structural design include shape of opening hole, size dimension, interval and stiffness of connecting bolt, moment of pre-tension and interval, etc. It is necessary not only to achieve the optimization under normal temperature, but also to consider the possible influence of high-temperature thermal expansion and additional heat stress.
Under normal conditions, the need for large diameter of opening hole of circular shaft and for proper stiffness of bolt is somewhat contradictory.
Airframe Structures and Materials
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