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双悬臂梁(Double Contilever Beam简称DCB)试样是一种单边裂纹,裂纹面弯曲加载的试样。早期使用DCB试样测量材料的表面能,近来在断裂韧性测量、裂纹体动态止裂和裂纹扩展动力学等研究工作中都广泛得到应用。恒位移DCB试样由于加工简单、使用方便等优点,特别适用于应力腐蚀断裂(SCC)性能和机理的研究。它不仅用于铝合金,也可用于钢铁及其它材料。但由该种试样得到的数据有时分散度很大,直接影响数据的使用价值和可靠性,本文就使用DCB试验中的几个问题,主要从影响分散度的几个方面进行分析和讨论。
The double cantilever (Double Contilever Beam referred to as DCB) specimen is a unilateral crack, the crack surface bending load specimen. The early use of DCB samples to measure the surface energy of materials has been widely used in recent studies such as fracture toughness measurement, dynamic crack arrest and crack propagation kinetics. The DCB sample with constant displacement is especially suitable for the study of SCC performance and mechanism due to its advantages of simple processing and easy operation. It is used not only for aluminum alloys but also for steel and other materials. However, the data obtained from this kind of sample sometimes has a very large degree of dispersion, which directly affects the value and reliability of the data. In this paper, several problems in the DCB test are used, mainly analyzed and discussed from several aspects affecting the dispersion degree.