高强钢高温下泊松比的云纹干涉法测量OA

When analyzing and designing the fire resistance of high-strength steel structures,the Poisson's ratio of high-strength steel is an important index.In order to accurately obtain the Poisson's ratio of high-strength steel at elevated temperatures and compare the difference between high-strength steel and ordinary steel,the moiré interferometry method was used to measure the Poisson's ratio of ordinary Q355 steel,high-strength Q460 steel,Q690 steel,and Q960 steel at 25℃,200℃,300℃,and 500℃.The test data were compared with available results in the literature for other types of steel.The results show that as the temperature increases,the Poisson's ratio increases slightly.Comparison of the test results for the four types of steel indicates that the degree of change in Poisson's ratio under high temperature is basically the same for different types of steel.The Poisson's ratio of mild Q355 steel and high-strength steel is lower than that of fire-resistant steel by about 10%.The test results can provide a reference for relevant research.