Aluminium Exhibition | Chinalco Materials Institute Achieves International Advanced Level in Technology and Equipment

Recently, the 'Full-Thickness Residual Stress Industrial Quantitative Characterization Technology and Equipment for Aerospace Aluminium Alloy Sheets Using the Slitting and Warping Method,' independently developed by Chinalco Materials Institute, successfully passed the achievement evaluation by the China Instrument and Control Society.

The evaluation team unanimously agreed that this technology and equipment solve the problem of industrial quantitative detection of internal residual stress distribution in domestic aerospace Aluminium alloy medium-thick plates. The developed 'slitting and warping method' thin plate internal residual stress testing equipment achieves industrial quantitative detection of internal residual stress distribution in domestic aerospace Aluminium alloy thin plates, filling a gap in the field of full-thickness industrial quantitative characterization of thin plates.

According to the aluminium exhibition, processing deformation caused by internal residual stress is a global 'challenge' in the industrial application of aerospace Aluminium materials. The 'slitting and warping method' full-thickness residual stress industrial quantitative characterization method proposed by Chinalco Materials Institute breaks the residual stress balance layer by layer in the thickness of the sheet, obtaining the residual stress distribution from the surface to the core of the sheet.

Based on this theory, Chinalco Materials Institute independently developed 'slitting and warping method' thick plate internal residual stress testing equipment. Compared to the layer removal method used by aerospace companies such as Boeing and Airbus, the measurement efficiency is increased by more than one time, and the repeatability of test results is improved by nearly one order of magnitude, solving industry problems and filling a gap in this field. This achievement has provided long-term tracking testing services for residual stress in aerospace thick plates, thin plates, and critical profiles of large aircraft for related enterprises, optimizing production process parameters and significantly improving the pass rate of product processing deformation.

The project achievements have obtained PCT international patents (Canada) and multiple national invention patents and software copyrights. The 'slitting and warping method' testing technology has been included in the first batch of industrial metrology achievement databases by the State Administration for Market Regulation.