Research On Combined Technology Of Aluminum Alloy Residual Stress Detection Method

Residual stress is an inherent stress prevalent in metal structural members.The existence of residual stress has obvious influence on the structural bearing capacity,buckling strength,brittle fracture,fatigue strength,stress corrosion and dimensional accuracy of aluminum alloy structural parts.Therefore,the characteristics of residual stress and its components are mastered in engineering design.The size and distribution pattern in the middle is especially important.At present,there are many methods for detecting residual stress at home and abroad.However,due to the limitations of instrumentation and detection methods,a single detection method is difficult to meet the requirements of aluminum alloy residual stress detection in engineering products.Therefore,it is of great engineering significance to study the combined technology of residual stress detection methods for aluminium alloys.This Article first analyzes the influence of the microstructure and detection parameters of the ray method on the detection results.According to the microstructure of the aluminum alloy commonly used in spacecraft,the detection parameters of the ray method are optimized,the parameters of the ultrasonic detection system are determined,and the unidirectional stress is derived.Under the acoustic elastic equation,the unidirectional stress coefficient of 5A06 and 5B70 aluminum alloys was calibrated by tensile test.Then,the equal-strength beam was designed as the method reference method.The cantilever-type equal-strength beam was detected by ray ultrasonic,and the plane-type equal-strength beam was detected by ray speckle.The test showed the residual stress detection by the ray method,the ultrasonic method and the speckle method.The consistency of the results proves that the three methods can be combined according to their respective applicability.Finally,for the typical wall structure of laser induced forming spacecraft,by analyzing the applicability of the detection method in thickness shape and surface state,the method of zone detection is adopted to comprehensively characterize the overall stress state of the wall plate structure,which is realized in U.The combination of the method of shape stress detection proves the feasibility of the method of combined technology,avoids the limitations of the single detection method and improves the detection efficiency.At the same time,the research on the stress distribution of the laser induced forming process makes up for The blank of laser induced forming stress detection provides an important basis for product reliability evaluation and processimprovement.And through the practical application of stress detection of typical products such as aerospace cabin,the practicality of the detection method is verified.