锻压技术

高强铝合金锻件KIC值的测试方法研究

英文标题：Study on test method of KIC value for high strength aluminum alloy forging

作者：彭富华陈波李付国李江顾伟

分类号：TG146.21

出版年,卷(期):页码：2010,35(6):99-103

摘要：

分析对比了国内外高强铝合金锻件的断裂韧性测试方法，并采用不同的技术措施对超大规格或超厚型高强铝合金锻件的断裂韧性值的测试方法进行分析研究，得出了影响高强铝合金锻件KIC测定的具体原因。研究表明,通过一定技术措施，高强铝合金锻件的断裂韧性值KIC是可以采用小尺寸标准CT样获得，并能够通过原材料冶炼和锻造及热处理工艺的改进，提高其断裂韧性值KIC。而影响高强铝合金锻件KIC值成功测定的最根本措施是保证试样裂纹尖端的平面应变状态和塑性变形受到严重约束。

An analytical contrast was carried out on the fracture toughness test method of high strength aluminum alloy forging at home and abroad. The fracture toughness test method of oversized or ultra thickness high strength aluminum alloy was studied by adopting different technical measures and the reason which affects the result of KIC measurement was obtained. The result shows that through some technical measures, the fracture toughness of high strength aluminum alloy forging can be obtained by small scale CT standard sample. The fracture toughness value can be increased by improving the technology of material melting, forging and heat treatment. The most important thing of measuring the fracture toughness value correctly is to ensure the plane strain status of crack tip on sample and restraining the plastic deformation.

基金项目：

航空基础科学基金资助项目(03H53048)

参考文献：

［1］GB/T4161-2007.金属材料平面应变断裂韧度KIC试验方法[S].
［2］王洪山.实用断裂试验方法的意义与风容(二)[J].理化检验，1996,35(6):260-262.
［3］潘志军,黎文献.高强铝合金断裂韧性的研究现状及展望[J]. 材料导报，2002,16(7):14-17.
［4］沈君.高强铝合金预拉伸板的断裂韧性研究[J].轻合金加工技术，2008,36(9):46-50.
［5］Zhou Li.A new technique for determining fracture toughness KIC and its confidence with single DCB specimen[J]. Engineering Fracture Mechanics, 1996,55(1):133-137.
［6］Kim Wallin. Statistical re-evaluation of the ASME KIC and KIR fracture toughness reference curves[J].Nuclear Engineering and Design,1999,193:317-326.
［7］王峰会,何泽夏.脆性材料断裂韧性测试及表观断裂韧性的估算[J].稀有金属材料与工程，1999，28(6)：406-409.
［8］陈康华,齐雄伟.含两种尺度微裂纹的高强铝合金的断裂韧性模型[J].中国有色金属学报，2006,16(10):1678-1683.
［9］ASTM E399-09.Standard test method for linear-elastic plane-strain fracture toughness KIC of metallic materials[S].
［10］ASTM B646-06.Standard practice for fracture toughness testing of aluminum alloys[S].
［11］ASTM E1820-08a.Standard test method for measurement of fracture toughness[S].

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