Solid Lab Report Detail Design and Valid-Mechanical Engineering, Lecture notes of Mechanical Engineering

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3/14/25, 1:10 PM about:blank Solid Lab Report Detail Design and Valid Solid Lab Report Detail Design and Validation for a Light Aircraft Wing Strut 1, Introduction This experiment is in order to design a safer strut for an aircraft wing as shown in figure 1. And this report is a full description about this experiment including lab procedures, details about design and the comparison of theoretical analysis and experimental results. Figure 1 Geometrical Relationship ofthe wing strut Basically, there are two key challenges in this experiment, On the one hand, the resistance of buckling for the primary structure of this, strut—aluminum beam is a significant value to judge strength of this strut. In other words, itis necessary to analyze the ability of this aluminum beam about supporting a defined oad within a reasonable stress and an acceptable deflection [1]. On the other hand, for the end fittings of this beam, spot-welding ‘method was used to fix them to two steel plates. Specifically, spot-welding method gained its popularity in resistance welding area because of the conveniences, simplification and low technic skills requirements [2]. Hence the strength and the stiffness of the welding part will also effect on the stability of this strut. To be specific, this strut will carry 2.6KN load on axial direction of the aluminum beam and the requirement here is the transverse deflection of the central point of this beam cannot larger than Smm. Moreover, the failure of the welding part is required to happen after the buckling failure. On the basis of this, coupon test—to analyze the strength and stiffness of the welding points will happen before the strut design. In addition, the objectives of this report are shown as follows: 1, In Part two—Procedure, the objective here is going to provide a full description of the experiment, such as coupon test, experimental set-up, procedures, and the analysis of the testing group data will also be provided in this part as well. Finally, the experimental results of the two welding points under aluminum-steel and steel- steel conditions will be obtained. Morcover, author will also provide an error analysis in this part. 2. In Part three—Results, the design of author’s group will be shown in details, and the explanation of why we doing like that will also be provided. 3. In Part Four—Discussion and Conclusions, a comparison of the design of author’s group and the designs of other groups will be shown. And finally, on the basis of the comparison, an optimal design will be obtained. Furthermore, these objectives are perfectly met in this report. 2. Procedure 2.1 First experiment—Coupon test This experiment consists of 4 parts, coupon, test, strut design & manufacturing, welding and test. For the coupon test, the performance of spot- welding method such as stiffness and strength 118