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本文用激光显微散斑干涉法研究了缺口微小区域内(约1mm~2)面内位移和应变的精细分布。对LY12—CZ铝合金拉板双边缺口试件在小范围屈服的情况下进行了测试,测得裂尖张开位移CTOD及其与载荷的关系和应力强度因子K_1。试验数据与理论值符合良好。激光显微散斑干涉法具有方法简单,测量精度高,灵敏度可在较广范围内选择等优点,可用于高应力集中区内微小区域的应变精确测量,并可为微观或亚微观的断裂测试提供有用手段。
In this paper, the microscopic speckle interferometry was used to study the fine distribution of in-plane displacement and strain in micro-notch area (about 1mm~2). The LY12-CZ aluminum alloy pull-plate double-sided notch specimens were tested under small-diameter yield conditions. The CTOD and its relationship with the load and the stress intensity factor K_1 were measured. The test data is in good agreement with the theoretical values. The laser microscopic speckle interferometry has the advantages of simple method, high measurement accuracy and sensitivity that can be selected within a wide range. It can be used to accurately measure the strain in the micro area of the high stress concentration area, and can be used for microscopic or submicroscopic fracture testing. Provide useful tools.