| LC4铝合金厚板在复杂应力应变状态下的断裂机制 |
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| 引用本文： | 李焕喜,陈昌麒.LC4铝合金厚板在复杂应力应变状态下的断裂机制[J].航空学报,1990,11(1):106-110. |
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| 作者姓名： | 李焕喜 陈昌麒 |
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| 作者单位： | 北京航空航天大学
(李焕喜)，北京航空航天大学(陈昌麒) |
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| 摘 要： | <正> 一、引言 把铝合金厚板直接加工成整体构件,用作飞机大梁壁板等结构,是现代飞机设计和制造过程中的一项先进技木。我国目前也在开始进行这方面的研究。由于在整体构件上不可避免地要打孔、开槽或加工有其它形式的截面突变部位,材料实际所承受的应力应变状态比较复杂。为保证这类整体构件的安全可靠及最佳的使用性能,需要对厚板的断裂行为有所了解。因此,本文将在试验室条件下以LC4铝合金厚板在复杂应力应变状态下的断裂机制进行考察。
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| 关 键 词： | 铝合金厚板 三轴张应力 沿晶开裂 快速剪切 |
ON THE MECHANISM OF FRACTURE OF LC4 ALUMINIUM ALLOY PLATE UNDER COMPLICATED STRESS STATES |
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| Beijing University of Aeronautics and Astronautics Li Huanxi and Chen Changqi.ON THE MECHANISM OF FRACTURE OF LC4 ALUMINIUM ALLOY PLATE UNDER COMPLICATED STRESS STATES[J].Acta Aeronautica et Astronautica Sinica,1990,11(1):106-110. |
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| Authors: | Beijing University of Aeronautics and Astronautics Li Huanxi and Chen Changqi |
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| Institution: | Beijing University of Aeronautics and Astronautics Li Huanxi and Chen Changqi |
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| Abstract: | The fracture mechanism of notched round bears and notched plane strain tension specimens of LC4 aluminum alloy plate have been investigated in this study. It was found that under high enough triaxial tensile stress intergranular splitting always appeared first. As soon as the splitting plane grew to a critical size, fast shear along short transverse direction of the plate followed locally just in its vici-nitv. Propagation of this kind oi shear lead the, specimens to a catastrophic iailure. The extent of intergranular splitting as well as the scale of local last shear within its vicinity depend mainly on the value oi triaxial tensile stress pramerer (σm/σ). Different heat-treatments have also some effect on intergranuler splitting but did not change the macroscopic modes and the microscopic characteristics of fracture. |
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| Keywords: | aluminium plate triaxial tensile stress intergranular splitting fast shear |
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