Measurement of Surface Residual Stress of 3003 Aluminum Alloy by X-ray Diffraction

The most suitable diffraction angle of 3003 aluminum alloy used for residual stress measurment was determined.The stress caused by the load is assumed to be surface residual stress.The stress of loading 3003 aluminum alloy was analyzed by the traditional electrical measurment method and X-ray stress measurement.With the electrical measurment method as reference,the measured values were abtained from the X-ray diffraction method when the diffraction angle were 142° and 156°,and then compared with those obtained from electrical measurment method.The measurement results demonstrate that the diffraction angle at 156 ° is better than at 142 ° based on the assessment standards of the liner slope and the distribution of data.Thus,the optimum diffraction angle for X-ray to measure the macroscopic residual stress of aluminum alloy 3003 is 156 °.