【摘要】 本文用激光显微散斑干涉法研究了缺口微小区域内（约1mm²）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K₁。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。更多还原

【Abstract】 In this paper,using the microscopic technique of laser speckle interferometry, the accurate distributions of in-plane displacement and strain in a small region near the root of notch （about 1 mm²） are studied. Testing LY—12—CZ aluminum alloy specimens with a double-edge-notch loaded in tension under small scale yielding, the crack tip opening displacement CTOD, the relation between CTOD and the load and stress-intensity factor K₁ are obtained. It is shown that experimental data agree with analytical values quite well. The approach proposed possesses advantages of easy to operate, higher measuring accuracy and wider range of measuring sensitivity chosen. It can be used to measure strains in the region of high stress concentration and can also provide an useful tool for microscopic or sub-microscopic determinations of fracture.更多还原